典型文献
Suppression of self-sustained oscillations of incompressible flow over aperture-cavities and its mechanisms
文献摘要：
Experiments and large-eddy simulations(LESs)are conducted to study the effectiveness and the underlying physical mechanisms of a passive control technique for suppressing the self-sustained oscillations of incompressible flow over aperture-cavities.The control technique is implemented by installing a wedge block above the chamfered leading-edge.The experiments are carried out in a low-speed water tunnel with the freestream velocity ranging from 0.4 m/s to 4.4 m/s,while the large-eddy simulations are carried out corresponding to the experiment at a velocity of 4.0 m/s.The wall pressure fluctuations measured along the cavity floor show that a significant suppression of the self-sustained oscillations of the shear layers can be achieved by the control device.Furthermore,the suppression performance is improved as the freestream velocity increases,not limited to the design point of the control device.The analysis of numerical simulation results focuses on three aspects,the vorticity fields,the velocity fields and the pressure fields,and the physical effects of the control device on the incompressible aperture-cavity flow are visualized.Three mechanisms of suppressing the cavity oscillations are identified from the numerical results,which are the destruction of the large vortex structures by the high frequency vortical excitations,the inhabitation of the intracavity recirculation feedback by introducing the lower shunt flow,and the attenuation of the trailing-edge impingement by thickening the shear layer.
文献关键词：
中图分类号：
作者姓名：
Wen-wen Zhang;Rong-wu Xu;Lin He;Jia Duan
作者机构：
Institute of Vibration and Sound Naval University of Engineering,Wuhan 430033,China;National Key Laboratory on Ship Vibration and Noise,Naval University of Engineering,Wuhan 430033,China
文献出处：
引用格式：
[1]Wen-wen Zhang;Rong-wu Xu;Lin He;Jia Duan-.Suppression of self-sustained oscillations of incompressible flow over aperture-cavities and its mechanisms)[J].水动力学研究与进展B辑,2022(05):876-892
A类：
LESs,chamfered,inhabitation
B类：
Suppression,self,sustained,oscillations,incompressible,flow,over,aperture,cavities,its,mechanisms,Experiments,large,eddy,simulations,are,conducted,study,effectiveness,underlying,physical,passive,control,technique,suppressing,implemented,by,installing,wedge,block,above,leading,experiments,carried,out,speed,water,tunnel,freestream,velocity,ranging,from,while,corresponding,wall,pressure,fluctuations,measured,along,floor,show,that,significant,suppression,shear,layers,be,achieved,device,Furthermore,performance,improved,increases,not,limited,design,point,analysis,numerical,results,focuses,three,aspects,vorticity,fields,effects,visualized,Three,identified,which,destruction,vortex,structures,high,frequency,vortical,excitations,intracavity,recirculation,feedback,introducing,lower,shunt,attenuation,trailing,impingement,thickening
AB值：
0.502521
相似文献
机标中图分类号，由域田数据科技根据网络公开资料自动分析生成，仅供学习研究参考。
