Drag reduction characteristics of recirculation flow at rocket base in an RBCC engine under ramjet/scramjet mode  

作　　者：Menglei LI Mingbo SUN Peibo LI Daoning YANG Bin AN Yizhi YAO Jikai CHEN Taiyu WANG Jiaoru WANG 

机构地区：[1]Hypersonic Technology Laboratory,National University of Defense Technology,Changsha 410073,China [2]Department of Aerospace Science and Technology,Space Engineering University,Beijing 101416,China

出　　处：《Chinese Journal of Aeronautics》2024年第3期104-115,共12页中国航空学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.11925207 and 92252206);the Hunan Province Graduate Innovation Project,China(No.XJCX2023059)。

摘　　要：To reduce the drag generated by the recirculation flow at the rocket base in a RocketBased Combined Cycle(RBCC)engine operating in the ramjet/scramjet mode,a novel annular rocket RBCC engine based on a central plug cone was proposed.The performance loss mechanism caused by the recirculation flow at the rocket base and the influence of the plug cone configuration on the thrust performance were studied.Results indicated that the recirculation flow at the rocket base extended through the entire combustor,which creates an extensive range of the"low-kineticenergy zone"at the center and leads to an engine thrust loss.The plug cone serving as a surface structure had a restrictive effect on the internal flow of the engine,making it smoothly transit at the position of the large separation zone.The model RBCC engine could achieve a maximum thrust augmentation of 37.6%with a long plug cone that was twice diameter of the inner isolator.However,a shorter plug cone that was half diameter of the inner isolator proved less effective at reducing the recirculation flow for a supersonic flow and induced an undesirable flow fraction that diminished the thrust performance.Furthermore,the effectiveness of the plug cone increased with the flight Mach number,indicating that it could further broaden the operating speed range of the scramjet mode.

关 键 词：Rocket-based combined cycle Ramjet/scramjet mode Plug cone Drag reduction k-x SST turbulent model 

分 类 号：TJ7[兵器科学与技术—武器系统与运用工程]