Experiments in Fluids最新文献_第8页

On-road vehicle aerodynamics with a large-scale stereoscopic-PIV setup: “the Ring of Fire” 基于大规模立体piv装置的道路车辆空气动力学：“火环”

IF 2.5 3区工程技术

Experiments in Fluids Pub Date : 2025-06-05 DOI: 10.1007/s00348-025-04025-w

Steffen Hüttig, Malte Kühn, Timo Gericke, Guus Bloem, Andrea Sciacchitano, Rinie A. D. Akkermans

{"title":"On-road vehicle aerodynamics with a large-scale stereoscopic-PIV setup: “the Ring of Fire”","authors":"Steffen Hüttig, Malte Kühn, Timo Gericke, Guus Bloem, Andrea Sciacchitano, Rinie A. D. Akkermans","doi":"10.1007/s00348-025-04025-w","DOIUrl":"10.1007/s00348-025-04025-w","url":null,"abstract":"<p>This paper presents the first full-scale particle image velocimetry (PIV) measurements to analyze the flow field of a car under real driving conditions. The Ring of Fire (RoF) measurement concept, introduced by Terra et al. (Exp Fluids 58:83, 2017. https://doi.org/10.1007/s00348-017-2331-0), is adapted to automotive demands to validate CFD simulations for further improvements of vehicle aerodynamics. The experiment consists of a tunnel setup, where neutrally buoyant helium-filled soap bubbles are used as flow tracers and are illuminated by two high-speed lasers. Four high-speed cameras captured the particles motion in two separate Stereo-PIV configurations with fields of view of 1.3 <span>(times )</span> 0.6 m<sup>2</sup> and 2.8 <span>(times )</span> 2.2 m<sup>2</sup>. Data for a Volkswagen up!, while driving on a test track at a constant speed of 33.33 m/s, was acquired for the wake and the side mirror region and processed with standard multi-pass PIV algorithms, in order to quantify the flow field and estimate limits of the described measurement principle for on-road car aerodynamics. The resulting ensemble averaged velocity fields are compared with CFD simulations, showing agreement for the here considered cases within 7.0–9.7%, based on the root-mean-square error between the experimental and the numerical results. Furthermore, drag calculation from the obtained velocity fields based on moment conservation is performed and the percent difference to wind tunnel measurements reaches values below 3.0%.</p>","PeriodicalId":554,"journal":{"name":"Experiments in Fluids","volume":"66 6","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00348-025-04025-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145162594","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

Two-dye laser-induced fluorescence (LIF) thermometry for ice-water systems 冰水系统的双染料激光诱导荧光（LIF）测温

IF 2.5 3区工程技术

Experiments in Fluids Pub Date : 2025-06-04 DOI: 10.1007/s00348-025-04053-6

Muhammad Ahmad Mustafa, Chris C. K. Lai, Alex Zimmer

{"title":"Two-dye laser-induced fluorescence (LIF) thermometry for ice-water systems","authors":"Muhammad Ahmad Mustafa, Chris C. K. Lai, Alex Zimmer","doi":"10.1007/s00348-025-04053-6","DOIUrl":"10.1007/s00348-025-04053-6","url":null,"abstract":"<div><p>We present an extension to the two-dye two-color laser-induced fluorescence (LIF) thermometry technique so that it can be applied to ice-water systems for direct heat flux measurements near the ice-water interface. Our chosen dye pair consists of the temperature-sensitive dye rhodamine B (RhB) and the temperature-insensitive dye sulforhodamine 640 (SR640), mixed at the concentration ratio of <span>(C_textrm{RhB}/C_textrm{SR640} = 0.5)</span> which we found to be optimal in terms of signal strengths and temperature sensitivity when they are excited at 527 nm. Our extension relies on the creation of uniformly dyed ice and this can be achieved by adding 5 g/L of sugar into dyed solutions prior freezing. The dyes remain potent after one freezing and melting cycle and the added sugar brings negligible change to the freezing point of water. The developed technique has been applied to measure the temperature change due to the melting of a horizontal ice block immersed into an initially stagnant body of water in a box. The calculated Nusselt numbers are in good agreement with the established empirical correlation for free horizontal convection. Moreover, an important finding is that <i>in situ</i> calibration of the LIF technique is not needed as long as the concentration ratio, solvent, image magnification, and dye thickness remain the same among experimental setups.</p></div>","PeriodicalId":554,"journal":{"name":"Experiments in Fluids","volume":"66 6","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00348-025-04053-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161683","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

Three-dimensional positioning, sizing, and velocimetry of dilute sprays using paired astigmatic interferometric particle imaging (PAIPI) 使用配对像散干涉粒子成像（PAIPI）进行稀喷雾的三维定位、尺寸测定和速度测定

IF 2.5 3区工程技术

Experiments in Fluids Pub Date : 2025-06-04 DOI: 10.1007/s00348-025-04049-2

Ali Rostami, Ri Li, Sina Kheirkhah

{"title":"Three-dimensional positioning, sizing, and velocimetry of dilute sprays using paired astigmatic interferometric particle imaging (PAIPI)","authors":"Ali Rostami, Ri Li, Sina Kheirkhah","doi":"10.1007/s00348-025-04049-2","DOIUrl":"10.1007/s00348-025-04049-2","url":null,"abstract":"<div><p>A laser-based diagnostic, referred to as the Paired Astigmatic Interferometric Particle Imaging (PAIPI), is developed and used in the present study to measure the three-dimensional position, diameter, and velocity of non-reacting and dilute spray droplets. Separate two-dimensional Particle Tracking Velocimetry (PTV) is performed to assess the accuracy of the PAIPI technique for measuring the planar components of droplet velocity. Two operating conditions are tested: either water is sprayed into quiescent air or into a swirling co-flow of air with a mean bulk flow velocity of <span>(18.2,hbox {m s}^{-1})</span>. The mean diameter of the spray droplets is in good agreement with previous work. It is shown that, while the mean diameter of the droplets increases in the axial direction for the no co-flow test condition, the interaction of the swirling co-flow with the spray results in a more uniform spatial distribution of the droplet diameter. The probability density functions (PDFs) of the droplet planar velocity obtained using the PAIPI and PTV techniques are in good agreement. The results show that the interaction of the turbulent swirling flow with the droplets influences the PDFs of axial and tangential droplet velocity, while the PDF of the droplet radial velocity remains almost unchanged. The joint PDF analysis of the droplet diameter and velocity shows that, for both test conditions, larger droplets feature a narrow range of velocity variations. It is shown that the presence of the swirling co-flow leads to the formation of slightly smaller droplets across a wide range of velocities. The simultaneous measurement of droplet position, velocity, and diameter, that is performed in the present study, facilitates improved characterization of dilute sprays.</p></div>","PeriodicalId":554,"journal":{"name":"Experiments in Fluids","volume":"66 6","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145162115","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

An assessment of a bi-telecentric visualization system for schlieren imaging in high-speed wind tunnels 高速风洞中纹影成像双远心可视化系统的评估

IF 2.5 3区工程技术

Experiments in Fluids Pub Date : 2025-06-03 DOI: 10.1007/s00348-025-04061-6

Wenbo Zhu, Stuart J. Laurence

{"title":"An assessment of a bi-telecentric visualization system for schlieren imaging in high-speed wind tunnels","authors":"Wenbo Zhu, Stuart J. Laurence","doi":"10.1007/s00348-025-04061-6","DOIUrl":"10.1007/s00348-025-04061-6","url":null,"abstract":"<div><p>Bi-telecentric visualization systems, recently popularized for machine vision applications, share many similarities with traditional schlieren systems for flow visualization in high-speed wind tunnels. The intent of this work is to assess the feasibility of employing an off-the-shelf bi-telecentric system for schlieren-like imaging. Through benchtop experiments, it is found that a bi-telecentric system behaves equivalently to a schlieren system having a circular cutoff with a diameter larger than the focused beam (thus requiring a finite deflection angle before registering a response). By introducing a slight angular misalignment, however, the response curve of the system can be shifted to provide a finite response about zero deflection, though at the expense of a nonuniform background. This allows the visualization of even weak flow structures in wind tunnel experiments. The sensitivity of the telecentric system is approximately one-third that of a comparable Z-type schlieren; nevertheless, it exhibits a reduced depth of field (minimizing background disturbances), occupies a much reduced physical footprint, and is simpler to align. It is thus proposed that a bi-telecentric system with a modified aperture stop could provide a practical alternative for the visualization of high-speed flows.</p></div>","PeriodicalId":554,"journal":{"name":"Experiments in Fluids","volume":"66 6","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161709","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

Experimental study of gas jet-induced aero breakup of suspended bubbles 气体射流诱导悬浮气泡气动破碎的实验研究

IF 2.5 3区工程技术

Experiments in Fluids Pub Date : 2025-06-03 DOI: 10.1007/s00348-025-04048-3

Runze Duan, Hao Liu, Yifan Cao, Liansheng Liu, Yuanhe Yue

{"title":"Experimental study of gas jet-induced aero breakup of suspended bubbles","authors":"Runze Duan, Hao Liu, Yifan Cao, Liansheng Liu, Yuanhe Yue","doi":"10.1007/s00348-025-04048-3","DOIUrl":"10.1007/s00348-025-04048-3","url":null,"abstract":"<div><p>Effervescent atomization technology has been widely used in industrial production, firefighting, and other fields due to its simple structure, high atomization quality, and low energy consumption. This is accomplished through the aerodynamic fragmentation of the bubble stream as it exits the nozzle in free space. Therefore, the process of breaking the bubbles is of great consequence in determining the initial atomization pattern of the effervescent atomizing nozzle. Insufficient fragmentation of the bubble stream may result in diminished spray stability and atomization quality. To elucidate the process by which bubbles begin to fragment and to optimize the effervescent atomization technique, this study employed image analysis to delineate the breaking dynamics of suspended bubbles in high-speed side airflow and identifies three distinct modes of bubble aero breakup under such airflow-varying conditions. Moreover, the study systematically investigated the effects of airflow velocity and bubble diameter on the aerodynamic breakup of bubbles, introducing a novel bubble deformation indicator to predict the likelihood of bubble breakup occurrence. The findings indicate that as the axial velocity of the gas jet increased, the mode of bubble aero breakup transitioned from bubble detachment to windward and leeward breakup. Furthermore, the degree of deformation of the windward surface is essential in determining whether the bubble will break. This research revealed the dynamics of bubble aero breakup and identified the influential factors under disturbance conditions, offering a theoretical basis and practical guidance for engineering applications and scientific research.</p></div>","PeriodicalId":554,"journal":{"name":"Experiments in Fluids","volume":"66 6","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161243","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

Background-oriented-schlieren-based optical velocimetry of low-convective-Mach-number turbulent shear layers 基于背景取向的低对流马赫数湍流剪切层光学测速

IF 2.5 3区工程技术

Experiments in Fluids Pub Date : 2025-06-03 DOI: 10.1007/s00348-025-04031-y

Tanbo Zhou, Sai Lakshminarayanan Balakrishnan, Gregory A. Blaisdell, Sally P. M. Bane

{"title":"Background-oriented-schlieren-based optical velocimetry of low-convective-Mach-number turbulent shear layers","authors":"Tanbo Zhou, Sai Lakshminarayanan Balakrishnan, Gregory A. Blaisdell, Sally P. M. Bane","doi":"10.1007/s00348-025-04031-y","DOIUrl":"10.1007/s00348-025-04031-y","url":null,"abstract":"<div><p>Background-oriented schlieren (BOS)-based velocimetry is a potential method for achieving simultaneous measurements of density and velocity in a flow with density gradients. Similar to schlieren velocimetry, BOS velocimetry relies on (1) refraction of light due to density gradients and (2) the presence of turbulent eddies or contrast by high-/low-density fluid parcels to serve as seeding particles. Previous attempts at BOS velocimetry suffered from compounded noise, error propagation, and significant loss of spatial resolution due to the requirement for an additional round of interrogation. Kymography-based BOS velocimetry has been shown to produce accurate velocity measurements but at the expense of spatiotemporally averaging the flow field. The optical flow displacement estimation method was shown to be ineffective to yield useful velocity information for schlieren velocimetry, due to the large displacements of turbulent eddies between adjacent time instances. In the current work, a novel approach for BOS velocimetry is proposed that uses deformable image registration (DIR) in each of the two interrogation steps to obtain accurate, spatiotemporally resolved velocity fields. Ray-tracing simulations using density fields from CFD of low-convective-Mach-number turbulent mixing layers are leveraged to generate synthetic, experiment-like BOS images. The DIR method using isotropic total variation regularization is first used to reconstruct the instantaneous density gradient fields from the BOS images. Then, DIR using Maxwell’s demons is used in the second round to measure the displacements of turbulent eddies between two adjacent time instances. Comparison of the velocities extracted from BOS against the CFD fluid velocities demonstrates excellent capability of the proposed methodology..</p></div>","PeriodicalId":554,"journal":{"name":"Experiments in Fluids","volume":"66 6","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00348-025-04031-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161711","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

Estimation of effective eddy viscosity profile in Taylor-Couette flow by means of ultrasonic velocity profiler 用超声速度剖面仪估计Taylor-Couette流动中有效涡动粘度剖面

IF 2.5 3区工程技术

Experiments in Fluids Pub Date : 2025-05-31 DOI: 10.1007/s00348-025-04024-x

Akihide Takano, Yuji Tasaka, Yuichi Murai

{"title":"Estimation of effective eddy viscosity profile in Taylor-Couette flow by means of ultrasonic velocity profiler","authors":"Akihide Takano, Yuji Tasaka, Yuichi Murai","doi":"10.1007/s00348-025-04024-x","DOIUrl":"10.1007/s00348-025-04024-x","url":null,"abstract":"<div><p>We propose a method termed eddy viscosity profiler to quantify momentum transport in turbulent shear flows for evaluating turbulent modulation by additives such as bubbles and polymers. In the present method, effective eddy viscosity <span>(nu _t)</span> is estimated by substituting mean velocity profile to the equation of fluid motion for turbulent mean flows. Taylor-Couette flow in a fluid layer between rotating coaxial double cylinders was chosen as the measurement platform, and mean velocity profiles are obtained with ultrasonic technique. In the present paper, three classical regimes of Taylor-Couette flow of a Newtonian fluid were investigated to examine the applicability of the method. By analyzing the radial profiles of the spatiotemporal-mean angular velocity <span>(langle omegarangle)</span>, the radial profiles of <span>(nu _t)</span> are obtained. The spatially averaged <span>(nu _t)</span> shows non-monotonic behavior with respect to Reynolds number. Reynolds shear stress and turbulent production rate were also calculated from the estimated <span>(nu _t)</span>. Reorganization of the normalized <span>(nu _t)</span> by the normalized spatiotemporal-mean shear rate, which is also calculated from experimental data, enables us to compare with previous studies and to verify the <span>(nu _t)</span> profiles. To associate the idea of the effective eddy viscosity with the conventional concept in turbulent studies, Prandtl’s wall law was introduced to the <span>(langle omega rangle)</span> profiles. This comparison finds the similarity as <span>(nu _t/nu sim kappa Re_tau)</span>, where <span>(kappa)</span> and <span>(Re_tau)</span> are von-Karman constant and Reynolds number defined by friction velocity, respectively, and rationalizes the non-monotonic behavior of the spatially averaged <span>(nu _t)</span>.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":554,"journal":{"name":"Experiments in Fluids","volume":"66 6","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145171831","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

Investigation of in-cylinder flows and cycle-to-cycle variations in a small-bore gasoline direct-injection optical engine at different throttle openings and speeds 不同节气门开度和转速下小口径汽油直喷光学发动机缸内流动及循环变化研究

IF 2.5 3区工程技术

Experiments in Fluids Pub Date : 2025-05-31 DOI: 10.1007/s00348-025-04050-9

Ravi Velugula, Soumyanil Nayek, Balasubramanian Thiruvallur Loganathan, Lakshminarasimhan Varadhaiyengar, Asvathanarayanan Ramesh, Mayank Mittal

{"title":"Investigation of in-cylinder flows and cycle-to-cycle variations in a small-bore gasoline direct-injection optical engine at different throttle openings and speeds","authors":"Ravi Velugula, Soumyanil Nayek, Balasubramanian Thiruvallur Loganathan, Lakshminarasimhan Varadhaiyengar, Asvathanarayanan Ramesh, Mayank Mittal","doi":"10.1007/s00348-025-04050-9","DOIUrl":"10.1007/s00348-025-04050-9","url":null,"abstract":"<div><p>Small-bore engines are globally in high demand, particularly for two- and three-wheeler applications. Implementing direct-injection technology in these engines enhances performance, but it also poses challenges such as inhomogeneous mixture formation and fuel impingement. These issues can degrade performance, especially at lower speeds and throttle openings. To address these limitations, a thorough investigation of in-cylinder flow fields and their cycle-to-cycle variations (CCVs) is necessary. Therefore, in this study, particle image velocimetry is used to measure flow fields in a small-bore optical engine at different throttle openings (25% and 100% throttle at 600 rpm) and speeds (600 and 1200 rpm at 25% throttle). Ensemble-averaged flow fields are obtained and used to compare the temporal evolution of the flow fields across intake and compression strokes. Flow fields are found to be similar in structures for different speeds and, however, differ for different throttle openings. The kinetic energy and vorticity distributions, along with their cycle-averaged values, are subsequently analysed. CCV in the flow fields is quantified using the relevance index and proper orthogonal decomposition-based mean energy share metrics. CCV obtained from the two different metrics showed similar trends and complex dependence on throttle opening and speed. The CCV is observed to be higher during early intake under part throttle condition compared to full throttle condition. However, it becomes lower under part throttle in comparison with full throttle from the late intake to mid-compression, attributed to the increased flow field intensities under part throttle. For different speeds, the CCV is found to be comparable till the intake stroke; however, differences are observed from early compression and onwards.</p></div>","PeriodicalId":554,"journal":{"name":"Experiments in Fluids","volume":"66 6","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145171832","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

Experimental investigation on the near-ground flow structure of buoyancy-induced vortices with application to energy harvesting 浮力涡近地流动结构及其在能量收集中的应用实验研究

IF 2.5 3区工程技术

Experiments in Fluids Pub Date : 2025-05-31 DOI: 10.1007/s00348-025-04044-7

Z. Wang, N. A. Hawkes, M. MacDonald, J. E. Cater, R. G. J. Flay

{"title":"Experimental investigation on the near-ground flow structure of buoyancy-induced vortices with application to energy harvesting","authors":"Z. Wang, N. A. Hawkes, M. MacDonald, J. E. Cater, R. G. J. Flay","doi":"10.1007/s00348-025-04044-7","DOIUrl":"10.1007/s00348-025-04044-7","url":null,"abstract":"<div><p>This research investigates the near-ground flow within buoyancy-induced vortices at a laboratory scale, to study their suitability for energy harvesting. Two different sizes of ground-mounted vertical-axis turbine models were used to examine their impact on the flow. Time-averaged velocity components were measured using particle image velocimetry in both horizontal and vertical planes. Inlet swirl vanes were set at angles of 30°, 45° and 60°, from which one-cell, one-to-two-cell transition and two-cell type vortices were observed, respectively. Analysis of the time-averaged Navier–Stokes equations shows that centripetal acceleration and radial pressure gradient are the primary contributors to the force balance near the ground. The vortex developed with a 45° vane angle exhibits the minimum vortex wandering effect, corresponding to the lowest turbulence forces in both the radial and vertical directions. When a turbine model is introduced, it reduces the core swirl ratios and increases vertical advection near the ground. The maximum pressure differences induced by the tangential velocity at the vortex centre occur for the 45° vane angle case. For this vane angle, the vortex exhibits strong rotation without breaking down into a two-cell structure. The circulation ratios are calculated, which represent the ratio of turbine to vortex rotational speed. Higher values suggest a higher efficiency of the turbine model. The smaller turbine model is found to be more efficient for lower swirl ratios, while the larger turbine is more efficient for high-swirl vortices by encapsulating the wandering vortex cores.</p></div>","PeriodicalId":554,"journal":{"name":"Experiments in Fluids","volume":"66 6","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00348-025-04044-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145171062","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

Interaction of strong shock waves with perforated stainless-steel plate in a shock tube 激波管内带孔不锈钢板与强激波的相互作用

IF 2.5 3区工程技术

Experiments in Fluids Pub Date : 2025-05-29 DOI: 10.1007/s00348-025-04051-8

Sergey Golovastov, Grigory Bivol, Fyodor Kuleshov

引用次数: 0