Wall pressure control of a 3D cavity with lateral apertures and wall proximity

IF 2.3 3区工程技术 Q2 ENGINEERING, MECHANICAL

Experiments in Fluids Pub Date : 2024-11-15 DOI:10.1007/s00348-024-03900-2

Tarek Ammam, Laurent Keirsbulck, Jérémy Basley, Etienne Grappein, Sebastien Delprat, Tewfik Benazzouz, Denis Cornu, Marc Lippert, David Boussemart

{"title":"Wall pressure control of a 3D cavity with lateral apertures and wall proximity","authors":"Tarek Ammam, Laurent Keirsbulck, Jérémy Basley, Etienne Grappein, Sebastien Delprat, Tewfik Benazzouz, Denis Cornu, Marc Lippert, David Boussemart","doi":"10.1007/s00348-024-03900-2","DOIUrl":null,"url":null,"abstract":"<div><p>Flows over cavities are relevant to many branches of engineering and are known to be a source of instabilities, high-pressure disturbances, and large recirculating regions, leading to excessive pressure loads. In this paper, we study the dynamical behavior of a 6.44:1 length-to-depth transitional cavity flow (i.e., where the shear layer partly enters the cavity) with wall proximity and lateral apertures. Mitigation of pressure loads is investigated through steady blowing upstream of the cavity’s leading edge. Concurrent pressure and particle image velocimetry (PIV) measurements along with companion unsteady numerical simulations have been performed to identify the mechanisms underlying the flow dynamics of both baseline and controlled cases. Experiments are reproduced numerically using the Improved Delayed Detached Eddy Simulations (<span>IDDES</span>) approach with shear stress transport eddy viscosity model (<span>\\(k-\\omega\\)</span> SST) at a Reynolds number of <span>\\(Re=2.8 \\times 10^5\\)</span>. Results underline that steady blowing changes the flow drastically upstream of the cavity by thickening the boundary layer and reducing the flow rate passing the cavity. The controlled flow transforms the dynamics of the cavity shear layer, impacting the inner cavity flow, and leads to a significant reduction of the pressure loads. This mitigation is associated with a strong reduction in turbulent momentum at the shear layers interface.</p></div>","PeriodicalId":554,"journal":{"name":"Experiments in Fluids","volume":"65 12","pages":""},"PeriodicalIF":2.3000,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Experiments in Fluids","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1007/s00348-024-03900-2","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}

引用次数: 0

Abstract

Flows over cavities are relevant to many branches of engineering and are known to be a source of instabilities, high-pressure disturbances, and large recirculating regions, leading to excessive pressure loads. In this paper, we study the dynamical behavior of a 6.44:1 length-to-depth transitional cavity flow (i.e., where the shear layer partly enters the cavity) with wall proximity and lateral apertures. Mitigation of pressure loads is investigated through steady blowing upstream of the cavity’s leading edge. Concurrent pressure and particle image velocimetry (PIV) measurements along with companion unsteady numerical simulations have been performed to identify the mechanisms underlying the flow dynamics of both baseline and controlled cases. Experiments are reproduced numerically using the Improved Delayed Detached Eddy Simulations (IDDES) approach with shear stress transport eddy viscosity model (\(k-\omega\) SST) at a Reynolds number of \(Re=2.8 \times 10^5\). Results underline that steady blowing changes the flow drastically upstream of the cavity by thickening the boundary layer and reducing the flow rate passing the cavity. The controlled flow transforms the dynamics of the cavity shear layer, impacting the inner cavity flow, and leads to a significant reduction of the pressure loads. This mitigation is associated with a strong reduction in turbulent momentum at the shear layers interface.

Abstract Image

查看原文本刊更多论文

具有横向开孔和接近壁面的三维空腔的壁面压力控制

空腔上的流动与许多工程分支有关，众所周知，空腔上的流动是不稳定、高压扰动和大循环区域的来源，从而导致过大的压力负荷。在本文中，我们研究了长度与深度比为 6.44:1 的过渡空腔流（即剪切层部分进入空腔）的动力学行为，该空腔流具有壁面接近性和横向孔隙。通过对空腔前缘上游的稳定吹气，研究了压力负荷的缓解情况。同时进行的压力和粒子图像测速（PIV）测量以及配套的非稳态数值模拟确定了基线和受控情况下流动动力学的基本机制。使用改进的延迟分离涡流模拟（IDDES）方法和剪应力传输涡流粘度模型（k-omega/）SST，在雷诺数（Re=2.8\times 10^5）下对实验进行了数值模拟。结果表明，稳定鼓风通过增厚边界层和降低通过空腔的流速，使空腔上游的流动发生了急剧变化。受控流动改变了空腔剪切层的动态，影响了空腔内部的流动，导致压力负荷显著降低。这种缓解与剪切层界面处湍流动量的大幅减少有关。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Experiments in Fluids 工程技术-工程：机械

CiteScore

5.10

自引率

12.50%

发文量

157

审稿时长

3.8 months

期刊介绍： Experiments in Fluids examines the advancement, extension, and improvement of new techniques of flow measurement. The journal also publishes contributions that employ existing experimental techniques to gain an understanding of the underlying flow physics in the areas of turbulence, aerodynamics, hydrodynamics, convective heat transfer, combustion, turbomachinery, multi-phase flows, and chemical, biological and geological flows. In addition, readers will find papers that report on investigations combining experimental and analytical/numerical approaches.