Fluid Dynamics最新文献_第6页

Experimental Investigation of Conical Tabs for Mixing Enhancement in Subsonic Circular Jets 亚音速圆形射流中锥形叶片增强混合的实验研究

IF 0.6 4区工程技术

Fluid Dynamics Pub Date : 2026-05-29 DOI: 10.1134/S0015462826604420

D. L. Vasthadu Vasu Kannah, S. Bogadi

引用次数: 0

Experimental Study on the Effect of Flexibility and Amplitude–Frequency Parameters on the Hydrodynamic Propulsion Performance of Bio-Inspired Flexible Flapping-Foils 柔性和幅频参数对仿生柔性扑翼水动力推进性能影响的实验研究

IF 0.6 4区工程技术

Fluid Dynamics Pub Date : 2026-05-29 DOI: 10.1134/S0015462826600331

H. Ding, K. Chen, Y. W. Zhu, Q. Gao, H. P. Shen, H. P. Shi

引用次数: 0

Design and Development of Aircraft Wing Using Various Flow Control Methods 采用多种流动控制方法的飞机机翼设计与开发

IF 0.6 4区工程技术

Fluid Dynamics Pub Date : 2026-05-29 DOI: 10.1134/S0015462826600185

S. Saranya, K. Balaji, M. M. Gor, A. B. Patel, C. K. Akhil, M. Vishnupriya

{"title":"Design and Development of Aircraft Wing Using Various Flow Control Methods","authors":"S. Saranya, K. Balaji, M. M. Gor, A. B. Patel, C. K. Akhil, M. Vishnupriya","doi":"10.1134/S0015462826600185","DOIUrl":"10.1134/S0015462826600185","url":null,"abstract":"The paper aims to estimate the potency of the active flow control technique by comparing different injection suction systems on an aerofoil, with the objective of enhancing its aerodynamic performance. Various injection suction mechanisms are analysed and compared with a baseline configuration by means of numerical investigations at the flow Reynold number 5.1 × 105. The vertical injection suction system manifests significantly better results, improving the stall angle by 33%, and increasing the lift coefficient by up to 51% as compared to both the baseline and traditional co-flow jet aerofoils. This research is an effort directed to identifying and comparing suitable injection suction methods for enhancement of aerofoil performance. The novelty and superiority of the vertical injection suction system as an active flow control method need not be over-emphasized as it exhibits comparatively more promising results. Additionally, the proposed method is viable and will suffice for various applications in subsonic aircraft wings with advantages such as reduced pumping power requirements compared to the conventional co-flow jet method.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"61 2","pages":""},"PeriodicalIF":0.6,"publicationDate":"2026-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148173339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Vortex Convective Heat-transfer Enhancement with a Single Inclined Groove’s Depth Increase on a Flat Plate during Turbulent Airflow 紊流条件下平板单斜槽深度增加对涡旋对流换热的增强作用

IF 0.6 4区工程技术

Fluid Dynamics Pub Date : 2026-05-26 DOI: 10.1134/S0015462826600409

S. A. Isaev, Dehai Kong, D. V. Nikushchenko, Ar. G. Sudakov, S. Z. Sapozhnikov, V. Yu. Mityakov, V. V. Seroshtanov, V. B. Kharchenko, A. A. Gusakov

{"title":"Vortex Convective Heat-transfer Enhancement with a Single Inclined Groove’s Depth Increase on a Flat Plate during Turbulent Airflow","authors":"S. A. Isaev, Dehai Kong, D. V. Nikushchenko, Ar. G. Sudakov, S. Z. Sapozhnikov, V. Yu. Mityakov, V. V. Seroshtanov, V. B. Kharchenko, A. A. Gusakov","doi":"10.1134/S0015462826600409","DOIUrl":"10.1134/S0015462826600409","url":null,"abstract":"In the present study, the RANS-SST approach was employed for numerical modeling and gradient heatmetry, enabling the examination of convective heat transfer during turbulent airflow around a 45-angled groove on an isothermal steam-heated section of a flat plate under the following conditions: a Reynolds number (Re) of 3 × 104 with the groove’s depth varying from 0.05 to 0.35 relative to the groove’s width. Through experimental and numerical analysis, a twofold increase in relative heat flux was established at the inlet region of the bottom groove in the central longitudinal section within the high-intensity recirculation flow zone. Our investigation revealed the increase in separated flow, recirculation, downward, upward, and swirling flows within the groove with increased depth. In particular, a critical relative depth of 0.2 was identified, marking the onset of abnormal enhancement of separated flow and heat transfer in the inclined groove’s entrance on the heated plate. As the swirling flow progressed along the groove, its velocity escalated, accompanied by a considerable thinning of the near-wall layer in the entrance segment. In contrast, the near-wall layer thickened, especially toward the groove’s center and outlet.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"61 2","pages":""},"PeriodicalIF":0.6,"publicationDate":"2026-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148173187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Modeling of Shocks and Vortex Zones in Supersonic Flow past a Body of Revolution at a High Angle of Attack 超音速大迎角过转体时激波和涡区的模拟

IF 0.6 4区工程技术

Fluid Dynamics Pub Date : 2026-05-26 DOI: 10.1134/S001546282660447X

I. A. Shirokov, T. G. Elizarova

引用次数: 0

Мodel of a Finite-Thickness Boundary Layer in the Neighborhood of a Stagnation Point on the Surface in Subsonic Swirling Gas Flow 在亚声速旋转气体流动中，表面驻点附近有限厚度边界层的Мodel

IF 0.6 4区工程技术

Fluid Dynamics Pub Date : 2026-05-26 DOI: 10.1134/S0015462826604468

A. F. Kolesnikov, S. A. Vasil’evskii

{"title":"Мodel of a Finite-Thickness Boundary Layer in the Neighborhood of a Stagnation Point on the Surface in Subsonic Swirling Gas Flow","authors":"A. F. Kolesnikov, S. A. Vasil’evskii","doi":"10.1134/S0015462826604468","DOIUrl":"10.1134/S0015462826604468","url":null,"abstract":"Flows in the VGU-4 high-frequency plasmatron at the Ishlinsky Institute for Problems in Mechanics of the Russian Academy of Sciences are studied numerically. The study includes calculations of the electromagnetic field and flows in the discharge channel, flows past a cylindrical model in the pressure chamber, and boundary layer flows on the symmetry axis ahead of the model’s stagnation point. The formulation of the problem for calculating a chemically nonequilibrium boundary layer of finite thickness is supplemented with a second-order ordinary differential equation that describes swirl on the symmetry axis and the corresponding boundary conditions. A source term accounting for the symmetric swirl of the incoming jet is included in the radial momentum conservation equation, and a dimensionless parameter characterizing the swirl intensity in the boundary layer is introduced. A criterion is established from the numerical solution of the problem of a nonequilibrium boundary layer near the stagnation point in dissociated air flow. In accordance with this criterion, swirl must be taken into account when calculating the heat fluxes. Taking swirl into account reduces the heat flux at the stagnation point of the model by up to 30% at low plasmatron operating powers, whereas the swirl has almost no effect on the heat flux at high powers.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"61 2","pages":""},"PeriodicalIF":0.6,"publicationDate":"2026-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0015462826604468.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148173188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Rayleigh–Taylor Instability during the Motion of Water Layer in High-Temperature Rock 高温岩石中水层运动中的瑞利-泰勒不稳定性

IF 0.6 4区工程技术

Fluid Dynamics Pub Date : 2026-05-26 DOI: 10.1134/S0015462826604626

K. R. Zhitnikov, G. G. Tsypkin

引用次数: 0

Experimental Study of Decay Characteristics of a Rectangular Orifice Jet with Secondary Injections 二次注入矩形孔射流衰减特性的实验研究

IF 0.6 4区工程技术

Fluid Dynamics Pub Date : 2026-05-26 DOI: 10.1134/S0015462825604516

R. Arun Prasad, N. Krishna, S. Ilakkiya

{"title":"Experimental Study of Decay Characteristics of a Rectangular Orifice Jet with Secondary Injections","authors":"R. Arun Prasad, N. Krishna, S. Ilakkiya","doi":"10.1134/S0015462825604516","DOIUrl":"10.1134/S0015462825604516","url":null,"abstract":"The present experimental study focuses on exploring the decay characteristics of a Mach 0.6 jet ejected from a rectangular orifice of the aspect ratio (AR) equal to 2 under the influence of secondary injections in two configurations: injection along minor (IAM) and injection along diagonal (IAD). The secondary injections were introduced at three Mach numbers, namely, Ms = 0.8, 0.9, and 1.0. The total pressure decay along the streamwise direction (X), along longer (Y: major) and along shorter (Z: minor) directions have been measured to evaluate the jet decay and spreading characteristics. Axis-switching locations for the free and controlled jets were determined based on the evolution of the non-dimensional jet half-width (B*). The rectangular orifice jet displayed a shorter potential core (2.8Deq) when compared to that of a rectangular nozzle jet at the same aspect ratio and Mach number. The IAD is found to shorten the potential core and accelerate jet decay, whereas IAM destroys the potential core entirely, leading to rapid near-field mixing and early axis-switching, with a maximum upstream shift of 77%, observed at Ms = 1.0.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"61 2","pages":""},"PeriodicalIF":0.6,"publicationDate":"2026-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148173185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Influence of the Model of Ablation on Modeling the Trajectory, Mass Loss, and Energy Deposition of Meteoroids in the Atmosphere 烧蚀模式对大气中流星体轨迹、质量损失和能量沉积建模的影响

IF 0.6 4区工程技术

Fluid Dynamics Pub Date : 2026-05-26 DOI: 10.1134/S0015462826604201

I. G. Brykina, L. A. Egorova

引用次数: 0

Numerical Simulation of Air Plasma Flow in the Sectioned Discharge Channel of the VGU-3 HF Plasmatron VGU-3高频等离子体发生器分段放电通道内空气等离子体流动的数值模拟

IF 0.6 4区工程技术

Fluid Dynamics Pub Date : 2026-05-09 DOI: 10.1134/S0015462826600446

S. A. Vasil’evskii, A. F. Kolesnikov, E. S. Tepteeva

{"title":"Numerical Simulation of Air Plasma Flow in the Sectioned Discharge Channel of the VGU-3 HF Plasmatron","authors":"S. A. Vasil’evskii, A. F. Kolesnikov, E. S. Tepteeva","doi":"10.1134/S0015462826600446","DOIUrl":"10.1134/S0015462826600446","url":null,"abstract":"The subsonic air plasma flow in a sectioned discharge channel of the VGU-3 plasmatron is numerically investigated on the basis of Navier−Stokes equations, together with two-dimensional equations governing a vortex electromagnetic field. The calculations are performed for the pressures of 100 and 50 hPa and the anode power supply of the HF generator ranging from 100 to 300 kW. The plasma flow parameters, namely, the velocity components, the enthalpy, the temperature, the molar composition, and the Mach and Reynolds numbers are determined at the channel exit in these regimes. The radial profiles of the gas parameters at the channel exit, the parameter distributions along the axis of symmetry from the entry section to the channel exit, and the stream function and temperature contours within the channel are presented. It is shown that the use of a sectioned discharge channel in the VGU-3 plasmatron instead of a simple channel results in the fourfold increase of the longitudinal velocity component and a 10–20% reduction of the flow enthalpy at the axis of symmetry in the exit section for the regimes considered, which makes it possible to extend considerably the range of modeling the full-size aerodynamic heating in the experiments performed at VGU-3.","PeriodicalId":560,"journal":{"name":"Fluid Dynamics","volume":"61 2","pages":""},"PeriodicalIF":0.6,"publicationDate":"2026-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147849410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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