Experiments in Fluids最新文献_第10页

Simultaneous measurement of 3D velocity and 2D temperature fields for unsteady thermocapillary convection in thin liquid films 非定常液体薄膜热毛细对流三维速度场和二维温度场的同时测量

IF 2.7 3区工程技术

Experiments in Fluids Pub Date : 2026-06-20 DOI: 10.1007/s00348-026-04247-6

Kohki Ito, Koichi Nishino, Masaki Kudo

{"title":"Simultaneous measurement of 3D velocity and 2D temperature fields for unsteady thermocapillary convection in thin liquid films","authors":"Kohki Ito, Koichi Nishino, Masaki Kudo","doi":"10.1007/s00348-026-04247-6","DOIUrl":"10.1007/s00348-026-04247-6","url":null,"abstract":"<div><p>Thermocapillary convection driven by surface-tension gradients governs interfacial transport phenomena across a wide range of length scales, from thin liquid films to molten material processing. In crystal growth technologies, high-purity bulk single crystals are typically fabricated using the Czochralski and floating-zone methods, where hydrothermal waves (HTWs) arising from thermocapillary instabilities can induce defects. The development of a digital twin for HTW dynamics has the potential to enable flow control and optimize crystal growth. However, such a framework requires three-dimensional (3D) velocity information, while the full 3D velocity structure of HTWs has not yet been experimentally resolved. In this study, we measure the 3D velocity field of a fully developed HTW in a thin liquid film using tomographic stereo particle image velocimetry (TSPIV), combined with simultaneous infrared (IR) thermography of the free-surface temperature. Experiments are conducted in a rectangular container filled with silicone oil (Prandtl number 16.1). Characteristic HTW features, including propagation angle, frequency, phase velocity, and spatial wavenumber, are quantified and show good agreement with previous studies. Importantly, the volumetric measurements reveal three-dimensional roll organization and its direct correspondence with surface temperature patterns, which cannot be inferred from previous two-dimensional or pointwise measurements. In particular, source and suction flow regions near the free surface are identified through coupled velocity–temperature analysis. These results provide new physical insight into the three-dimensional structure and thermal–flow coupling of HTWs and support the use of IR-based temperature data for constructing digital twins of thermocapillary convection.</p></div>","PeriodicalId":554,"journal":{"name":"Experiments in Fluids","volume":"67 7","pages":""},"PeriodicalIF":2.7,"publicationDate":"2026-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148281733","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Seeing through water: diffuse image-based depth measurements in three-dimensional dam-break flows 透过水透视：三维溃坝水流的漫射图像深度测量

IF 2.5 3区工程技术

Experiments in Fluids Pub Date : 2026-06-11 DOI: 10.1007/s00348-026-04239-6

Elia Buono, Roberto Bosio, Andrea Cagninei, Davide Poggi

{"title":"Seeing through water: diffuse image-based depth measurements in three-dimensional dam-break flows","authors":"Elia Buono, Roberto Bosio, Andrea Cagninei, Davide Poggi","doi":"10.1007/s00348-026-04239-6","DOIUrl":"10.1007/s00348-026-04239-6","url":null,"abstract":"<div><p>In this work we present a dedicated experimental facility and an image-based method for measuring water depth in a dam-break wave radially spreading over a horizontal plane. The facility consists of a prismatic reservoir containing water dyed with colorant and equipped with an interchangeable vertical breach, and a 22 <span>(textrm{m}^2)</span> plane that can be inclined up to 30<span>(^{circ })</span>. The plane is enclosed within a light box providing highly uniform illumination through an array of 60 LED floodlights. The evolution of the dye-induced color intensity associated with the advancing water layer is captured by two CMOS cameras on the light box’s ceiling. Preliminary tests were conducted to assess the spectral compatibility between the broadband white-LED emission, the CMOS sensor sensitivity, and the absorption properties of several dyes. This analysis identified the dye providing the highest attenuation within the effective spectral band of the imaging system, ensuring sensitivity to very small optical path lengths. Based on this characterization, a bi-exponential model is introduced to relate the color intensity to the optical path length. A series of dam-break experiments with three initial reservoir levels were performed to assess statistical repeatability. The high consistency observed across the repeated tests confirms the robustness of the measurement procedure. The validity of the reconstructed depth fields is further supported by independent estimates of the water volume released from the reservoir, obtained from an array of ultrasonic level sensors and from a calibrated analytical emptying model. Together, these comparisons confirm the reliability and accuracy of the proposed methodology.</p></div>","PeriodicalId":554,"journal":{"name":"Experiments in Fluids","volume":"67 7","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00348-026-04239-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148236648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Measurement of boundary layer velocity profiles with spatially and temporally varying surface temperature in high-speed flow 高速流动中随时间和空间变化表面温度的边界层速度分布测量

IF 2.5 3区工程技术

Experiments in Fluids Pub Date : 2026-06-11 DOI: 10.1007/s00348-026-04243-w

Kazuki Ozawa, Kshitij Sabnis, Paul Bruce

{"title":"Measurement of boundary layer velocity profiles with spatially and temporally varying surface temperature in high-speed flow","authors":"Kazuki Ozawa, Kshitij Sabnis, Paul Bruce","doi":"10.1007/s00348-026-04243-w","DOIUrl":"10.1007/s00348-026-04243-w","url":null,"abstract":"<div><p>This study presents the first time-resolved LDA measurement of streamwise streak generation induced by non-uniform surface temperature distributions in a Mach 2.75 supersonic turbulent boundary layer. To investigate the boundary layer’s response to transient thermal forcing, a flat plate is constructed from alternating streamwise strips of materials with dissimilar thermal diffusivities (copper and MACOR). Preheating the model prior to wind tunnel start-up generates controlled, spanwise periodic surface temperature gradients. To capture the rapid evolution of the flow field, a continuous-motion traverse system is employed for Laser Doppler Anemometry (LDA). This system enables the acquisition of full velocity profiles within 2 s, a timescale commensurate with the transient wall temperature evolution. The fidelity of this time-resolved technique is validated by the close agreement of the reconstructed velocity profiles with theoretical compound boundary layer models (Musker and non-adiabatic wake laws). A physics-informed thermal model is used to reconstruct the wall temperature history. The measurements successfully capture the evolution of the velocity profiles and quantify the formation of coherent velocity streaks. Streak amplitudes reach approximately 5% of the freestream value in the buffer layer and persist at 2% in the outer layer. Furthermore, the results reveal a linear relationship between the spanwise wall temperature difference and the generated streak amplitude, establishing passive thermal forcing as a robust and predictable mechanism for flow control.</p></div>","PeriodicalId":554,"journal":{"name":"Experiments in Fluids","volume":"67 7","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00348-026-04243-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148236650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optical emission spectroscopy and numerical characterization of thermochemical non-equilibrium in supersonic arc-jet plasma flows 超音速电弧喷射等离子体流中热化学不平衡的光学发射光谱和数值表征

IF 2.5 3区工程技术

Experiments in Fluids Pub Date : 2026-06-11 DOI: 10.1007/s00348-026-04233-y

Raffaele Costanzo, Stefano Mungiguerra, Anselmo Cecere, Mario De Cesare, Luigi Savino, Antonio Del Vecchio, Raffaele Savino

{"title":"Optical emission spectroscopy and numerical characterization of thermochemical non-equilibrium in supersonic arc-jet plasma flows","authors":"Raffaele Costanzo, Stefano Mungiguerra, Anselmo Cecere, Mario De Cesare, Luigi Savino, Antonio Del Vecchio, Raffaele Savino","doi":"10.1007/s00348-026-04233-y","DOIUrl":"10.1007/s00348-026-04233-y","url":null,"abstract":"<div><p>Accurately replicating atmospheric entry conditions in ground-based facilities is critical for the development of thermal protection systems (TPSs). This study utilizes optical emission spectroscopy (OES) as a versatile non-intrusive diagnostic technique to assess the chemical composition and thermodynamic state of the plasma generated in such facilities. In this study, emission spectra of the plasma flow produced by the SPES (Small planetary entry simulator) facility at the University of Naples “Federico II” were acquired and analyzed for two gas mixtures: an air-like composition (80% N₂ and 20% O₂) and pure nitrogen. Analysis of two regions (330–440 nm and 600–875 nm) identified the spectral signatures of N, N₂, N₂⁺, CN, and O. Further analysis of the emission spectra pointed to the thermodynamic non-equilibrium of the plasma. To support interpretation of the experimental results, computational fluid dynamics (CFD) simulations were performed using a five-species, single-temperature model and an 11-species (including ions), two-temperature model. Synthetic spectra generated from CFD data using the SPECAIR code were compared to the measured spectra. The two-temperature model demonstrated better agreement, confirming the non-equilibrium nature of the flow. This work highlights the diagnostic value of OES coupled with numerical tools for characterizing supersonic plasma flows.</p></div>","PeriodicalId":554,"journal":{"name":"Experiments in Fluids","volume":"67 7","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00348-026-04233-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148236649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Vortex ring impingement on wall-mounted convex half-cubes 壁挂式凸半立方体上的涡环撞击

IF 2.5 3区工程技术

Experiments in Fluids Pub Date : 2026-06-06 DOI: 10.1007/s00348-026-04246-7

Shuaihang Lin, Donglai Gao, Haiyang Yu

{"title":"Vortex ring impingement on wall-mounted convex half-cubes","authors":"Shuaihang Lin, Donglai Gao, Haiyang Yu","doi":"10.1007/s00348-026-04246-7","DOIUrl":"10.1007/s00348-026-04246-7","url":null,"abstract":"<div><p>Discrete vortex rings impinging on wall-mounted convex half-cubes with varying sizes were experimentally investigated at a fixed Reynolds number (<i>Re</i> = 1000). The side length (<i>a</i>) to the diameter of the circular orifice (<i>d</i>) includes <i>a/d</i> = 0.5, 1, 1.5, 2, 3. Using planar laser-induced fluorescence (PLIF) and particle image velocimetry (PIV), the upstream evolution was analyzed through vorticity, finite-time Lyapunov exponents (FTLEs) fields, and vortex core trajectories. The results show that vortex evolution and boundary layer separation are strongly influenced by surface geometry, especially sharp edges and curvature transitions. For small sizes (<i>a</i>/<i>d</i> ≤ 1), the vortex ring interacts with both the half-cube and wall, where edge-induced vorticity intensification accelerates the decay of primary vortex ring. At <i>a</i>/<i>d</i> = 0.5 and 1, stronger deformation and diffusion on Plane II lead to rapid coherence loss and fragmented FTLE ridges, suppressing the formation of tertiary vortex ring. For the intermediate size (<i>a</i>/<i>d</i> = 1.5), the interaction is confined to the half-cube, but the behavior of the primary vortex ring in the later stages of motion exhibits spatial heterogeneity. For larger sizes (<i>a</i>/<i>d</i> ≥ 2), the flow recovers canonical wall impingement patterns with symmetric secondary and tertiary vortex rings. These results clarify how sharp-edged convex geometries modulate vortex–boundary interactions and extend understanding of vortex ring impingement beyond smooth surfaces.</p></div>","PeriodicalId":554,"journal":{"name":"Experiments in Fluids","volume":"67 7","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148172749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Drag augmentation of a sphere in high-speed multi-phase flow 高速多相流中球体的增阻

IF 2.5 3区工程技术

Experiments in Fluids Pub Date : 2026-06-05 DOI: 10.1007/s00348-026-04237-8

Antonio Giovanni Schöneich, Stuart J. Laurence

{"title":"Drag augmentation of a sphere in high-speed multi-phase flow","authors":"Antonio Giovanni Schöneich, Stuart J. Laurence","doi":"10.1007/s00348-026-04237-8","DOIUrl":"10.1007/s00348-026-04237-8","url":null,"abstract":"<div><p>The impact of a gas/liquid two-phase flow on the drag of a sphere at supersonic conditions is investigated experimentally. To simulate flight through a cloud-like environment, the freestream of a Mach-4 Ludwieg tube is seeded with monodisperse liquid Di-Ethyl-Hexyl-Sebacate (DEHS) droplets with diameters ranging from 7 to <span>(16,upmu text {m})</span>. Drag measurements are performed using a free-flight methodology. The spheres are released impulsively into the freestream and thereafter allowed to respond to the experienced forces unhindered. A high-speed bi-telecentric visualization system is used to record the sphere trajectories, from which drag accelerations are then derived. Initial theoretical estimates of drag augmentation based on the increased effective density of the particle-laden flow yield increases of the order of 0.1% compared to an equivalent clean flow. The experimental measurements, however, indicate a drag increment of more than an order of magnitude higher, up to approximately 4%. In an attempt to explain these unexpectedly large increases, simulations of the particle trajectories downstream of the sphere bow shock are conducted. These indicate that the majority of the droplets are impacting the sphere surface supersonically, suggesting that shock impingement and/or the water-hammer effect may be contributing to the observed drag increase.</p></div>","PeriodicalId":554,"journal":{"name":"Experiments in Fluids","volume":"67 6","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148172831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Unlocking surfactant synergies for fluorine replacements: a microfluidic exploration of emulsion stability and coalescence dynamics 释放表面活性剂对氟替代品的协同作用：乳状液稳定性和聚结动力学的微流体探索

IF 2.5 3区工程技术

Experiments in Fluids Pub Date : 2026-06-05 DOI: 10.1007/s00348-026-04200-7

Rana Bachnak, Cari S. Dutcher

{"title":"Unlocking surfactant synergies for fluorine replacements: a microfluidic exploration of emulsion stability and coalescence dynamics","authors":"Rana Bachnak, Cari S. Dutcher","doi":"10.1007/s00348-026-04200-7","DOIUrl":"10.1007/s00348-026-04200-7","url":null,"abstract":"<div><p>Fluorinated surfactants are widely utilized in various applications, including firefighting foams, coatings, and lubricants. Their wide utility is due to their unique properties, such as their ability to effectively lower surface/interfacial tension. However, the excessive use of fluorinated surfactants has raised environmental and health concerns due to their persistence in the environment and potential toxicity. The need for effective and sustainable surfactant replacements has therefore become critical. Our study investigates alternative surfactants mixtures that have been proposed to replicate the performance of traditional fluorinated surfactants, while minimizing environmental impact. Here, we study the stability of thin aqueous liquid bridges found in water in oil emulsions, with surfactant mixtures shown to provide synergistic fire suppression in fluorine-free firefighting foams. Binary surfactant-water solutions of TritonX-100, Glucopon 215, and Dow 502W were used, in addition to a ternary surfactant-surfactant-water mixtures of Glucopon 215 and Dow502W. Emulsion stability is assessed using a microfluidic device designed to measure the coalescence frequency of an emulsion. Coalescence frequency is measured as a function of total flow rate and surfactant concentration. A non-monotonic trend of coalescence frequency with flow rate is found for all the surfactants used. In addition, a non-dimensional frequency is introduced and is found to decrease with the Capillary number. The coalescence frequency of the surfactant mixture is found to be close to that of Dow502W, suggesting a synergistic behavior between Glucopon215 and Dow502W, even with less of the siloxane surfactant present in the formulation. This behavior highlights the potential for pairing slower hydrocarbon surfactants with faster siloxane surfactants to achieve an effective alternative stabilizing agent for fluorine-free formulation.\u0000</p></div>","PeriodicalId":554,"journal":{"name":"Experiments in Fluids","volume":"67 6","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148172830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

In-situ gas-phase velocity field measurements in metal dust flames using novel fluorescent tracer particles 新型荧光示踪颗粒在金属粉尘火焰中的原位气相速度场测量

IF 2.5 3区工程技术

Experiments in Fluids Pub Date : 2026-06-05 DOI: 10.1007/s00348-026-04212-3

Thomas Krenn, Maria G. Horst, Christoph Möller, Henrik Schmitz, Tao Li, Benjamin Böhm, Andreas Dreizler

{"title":"In-situ gas-phase velocity field measurements in metal dust flames using novel fluorescent tracer particles","authors":"Thomas Krenn, Maria G. Horst, Christoph Möller, Henrik Schmitz, Tao Li, Benjamin Böhm, Andreas Dreizler","doi":"10.1007/s00348-026-04212-3","DOIUrl":"10.1007/s00348-026-04212-3","url":null,"abstract":"<div><p>Metal fuels have the potential to contribute to the defossilization of the energy system. To enable a knowledge-based design of future high-temperature energy systems, experimental characterization of fundamental combustion parameters is highly desired. One key parameter is the laminar burning speed and its dependence on the flow strain rate, which can be determined in laminar opposed jet flames. In experiments, Particle Tracking Velocimetry (PTV) or Particle Image Velocimetry (PIV) are commonly used techniques for determining local flow velocities. In metal dust flames, the fuel powder itself is frequently employed as tracer particles. However, depending on the particle size distribution, significant slip between the gas-phase flow and the dispersed metal particles may occur. This biases the accuracy of velocity field measurements and impedes the comparability between fuel samples with different particle size distributions. This work presents a novel method by developing spectrally distinctive fluorescent tracer particles (SDFT) to enable the in-situ characterization of gas-phase velocity fields in particle-laden flows. The production of these particles is based on adsorption of Rhodamine B on zeolite particles, yielding gas-phase tracers with well-defined optical properties and adequate thermal stability. Experiments under inert conditions highlight the necessity of direct gas-phase measurements, as both particle slip and momentum coupling are observed. Under reactive conditions, the applicability of the SDFT is demonstrated in iron dust flames stabilized within a laminar opposed jet burner. The results highlight the ability of the SDFT to resolve characteristic features of the axial velocity profile and to provide reliable gas-phase reference data.</p></div>","PeriodicalId":554,"journal":{"name":"Experiments in Fluids","volume":"67 6","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00348-026-04212-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148172494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Local solutions for characterizing the dynamics of liquefying fuels in slab experiments 平板实验中表征燃料液化动力学的局部解

IF 2.5 3区工程技术

Experiments in Fluids Pub Date : 2026-06-05 DOI: 10.1007/s00348-026-04244-9

Elektra A. Katz Ismael, Kenneth L. Budzinski, Paul E. DesJardin

{"title":"Local solutions for characterizing the dynamics of liquefying fuels in slab experiments","authors":"Elektra A. Katz Ismael, Kenneth L. Budzinski, Paul E. DesJardin","doi":"10.1007/s00348-026-04244-9","DOIUrl":"10.1007/s00348-026-04244-9","url":null,"abstract":"<div><p>The focus of this study is to analyze the mass loss over two distinct regions of the slab—the leading edge which is dominated by entrainment and downstream which is dominated by the film flow. Experiments are performed in <span>(200 ^{circ })</span>C, high speed air using paraffin wax slabs. For the leading edge, a force balance is performed using shear stress data from direct numerical simulations (DNS) to estimate a lobe height and is compared to the flat plate assumption and experimental data. The paraffin samples have <span>(90^circ )</span>, <span>(45^circ )</span>, and <span>(20^circ )</span> leading edge angles to compare shear stress profiles for different inlet angles. The error in the height approximation is below <span>(20%)</span> for the DNS shear stress profile case while the flat plate assumption can exceed <span>(80%)</span>. For estimating the film mass loss rate, 4 quasi-steady models are compared by calculating the height under different assumptions and comparing to experimental thermocouple data for a sample with a <span>(45^{circ })</span> leading edge. It is found that the height can be non-dimensionalized, which can aid future predictions of the film thickness. Finally, the film mass loss rate is calculated and divided by the total mass loss rate from the experiment to show film loss percentages of 46–64<span>(%)</span>.\u0000</p></div>","PeriodicalId":554,"journal":{"name":"Experiments in Fluids","volume":"67 6","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00348-026-04244-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148172952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Instantaneous pressure reconstruction from PIV in compressible launcher conditions PIV在可压缩发射条件下的瞬时压力重建

IF 2.5 3区工程技术

Experiments in Fluids Pub Date : 2026-06-05 DOI: 10.1007/s00348-026-04229-8

A. D’Aguanno, F. F. J. Schrijer, B. W. van Oudheusden

{"title":"Instantaneous pressure reconstruction from PIV in compressible launcher conditions","authors":"A. D’Aguanno, F. F. J. Schrijer, B. W. van Oudheusden","doi":"10.1007/s00348-026-04229-8","DOIUrl":"10.1007/s00348-026-04229-8","url":null,"abstract":"<div><p>Unsteady pressure fluctuations in transonic launcher configurations represent a major challenge, driven by shock oscillations, flow separation, and compressibility effects. To address these phenomena, this work presents and validates a methodology for reconstructing instantaneous pressure fields from planar (2D2C) and stereo particle image velocimetry (2D3C PIV) data using Taylor’s hypothesis. The approach is first assessed using a simulated PIV dataset of an axisymmetric backward-facing step, representing a launcher base flow configuration. In this case, the Taylor-based pressure reconstruction is validated against reference data and compared with results from a hypothetical time-resolved pressure reconstruction, demonstrating the accuracy of the method.</p><p>The methodology is then applied to wind tunnel PIV data of a VEGA-like hammerhead launcher model at Mach 0.8 and zero angle of attack. Hammerhead configurations, characterized by payload fairings with a larger diameter than the main body, are particularly prone to separation and intense pressure fluctuations in the transonic ascent phase. The reconstructed pressure fields are analyzed together with unsteady transducer data, providing a general characterization of the flow features (oscillating shock, separation, and reattachment) and showing very good agreement for instantaneous, mean, and fluctuating components (ΔC<sub>p avg</sub> ~ 0.01–0.02; ΔC<sub>p std</sub> ~ 0.02). Finally, the analysis highlights the impact of neglecting out-of-plane velocity components, which introduces noticeable discrepancies in separated regions.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture><span>The alternative text for this image may have been generated using AI.</span></div></div></figure></div></div>","PeriodicalId":554,"journal":{"name":"Experiments in Fluids","volume":"67 6","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00348-026-04229-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148172493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0