Large eddy simulation of supersonic flow in ducts with complex cross-sections  

作　　者：Huifeng Chen Mingbo Sun Dapeng Xiong Yixin Yang Taiyu Wang Hongbo Wang 

机构地区：[1]Hypersonic Technology Laboratory,National University of Defense Technology,Changsha 410073,China

出　　处：《Theoretical & Applied Mechanics Letters》2023年第6期432-440,共9页力学快报（英文版）

基　　金：the National Natural Science Foundation of China(Grant Nos.92252206,12102471 and 11925207)。

摘　　要：Large Eddy Simulation(LES)has been employed for the investigation of supersonic flow characteristics in five ducts with varying cross-sectional geometries.The numerical results reveal that flow channel configurations exert a considerable influence on the mainstream flow and the near-wall flow behavior.In contrast to straight ducts,square-to-circular and rectangular-to-circular ducts exhibit thicker boundary layers and a greater presence of vortex structures.Given the same inlet area,rectangular-to-circular ducts lead to higher flow drag force and total pressure loss than square-to-circular ducts.Characterized by the substantial flow separation and shock waves,the"S-shaped duct shows significant vertically-asymmetric characteristics.

关 键 词：SCRAMJET LES Complex cross-section Boundary layer 

分 类 号：V235.21[航空宇航科学与技术—航空宇航推进理论与工程]