A Karman-Vortex Generator for passive separation control in a conical diffuser  

作　　者：ZHANG YuFei CHEN HaiXin FU Song 

机构地区：[1]School of Aerospace Engineering,Tsinghua University,Beijing 100084,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2012年第5期828-836,共9页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos.10932005,10972120 and 11102098);the China Postdoctoral Science Foundation (Grant No.2011M500301)

摘　　要：Flow separation in a conical diffuser with large divergence angle （29.14°） and large area ratio （3.533） is eliminated by a novel passive flow control device called Karman-Vortex Generator （KVG）. The effect of the KVG is verified and investigated by the URANS, DES and DDES methods based on the SST model. CFD results show that the performance coefficient of the diffuser can be doubled by the KVG, and the total pressure recovery coefficient can be improved by about 1.2%. DES and DDES re- suits show that the KVG can introduce a Karman-vortex street frequency in the diffuser. This frequency decays rapidly, and could not be detected in the ending plane of the expansion section, Different KVG configurations with different locations and dimensions are numerically simulated and compared. Some suggestions are provided.Flow separation in a conical diffuser with large divergence angle(29.14°) and large area ratio(3.533) is eliminated by a novel passive flow control device called Karman-Vortex Generator(KVG).The effect of the KVG is verified and investigated by the URANS,DES and DDES methods based on the SST model.CFD results show that the performance coefficient of the diffuser can be doubled by the KVG,and the total pressure recovery coefficient can be improved by about 1.2%.DES and DDES results show that the KVG can introduce a Karman-vortex street frequency in the diffuser.This frequency decays rapidly,and could not be detected in the ending plane of the expansion section.Different KVG configurations with different locations and dimensions are numerically simulated and compared.Some suggestions are provided.

关 键 词：conical diffuser Karman-Vortex Generator separation control DES 

分 类 号：V224.4[航空宇航科学与技术—飞行器设计] O357.1[理学—流体力学]