Passive Reduction of Pressure Fluctuation by Using Cylindrical Rod on Open Cavity


          

刊名：International Journal of Aeronautical and Space Sciences
作者：Yu, D. O.（Agcy Def Dev）
Kim, T. U.（Konkuk Univ）
Park, S. H.（Konkuk Univ）
Lee, S.（Inha Univ）
Yim, J. W.（Agcy Def Dev）
You, H. C.（Agcy Def Dev）
刊号：878E0016/I
出版年：2022
年卷期：2022, vol.23, no.1
页码：31-41
总页数：11
分类号：V4
关键词：Computational fluid dynamics；Cavity flow；Pressure fluctuation；Passive control；FLOW；OSCILLATIONS
参考中译：
语种：eng
文摘：Wind tunnel experiments and numerical simulations were performed on the cavity over a fuselage of an aircraft to investigate the control effect of passive control devices on pressure fluctuations. The experiments were conducted in subsonic flow, and the control effects of each passive control shape were compared and analyzed. The results indicated that the spoiler- and rod-type devices affect the pressure fluctuation differently, and the reduction effect is excellent when using the cylindrical rod. The changes in the flow structure due to passive control devices were numerically analyzed using unsteady turbulent flow simulation based on the improved detached eddy simulation (IDDES) model. Conditions similar to those in the wind tunnel experiment were applied, and the distribution and trend of the overall sound pressure level were in good agreement with the numerical results. The control effect in the transonic flow was analyzed using a cylindrical rod designed for subsonic flow. The energy cascade of the flow is accelerated due to the passive control device that makes the free shear layer to be unstable. Thus, the feedback mechanism is weakened. And finally, the pressure fluctuation inside the cavity is reduced.



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