空气动力学学报2025，Vol.43Issue(12)：64-80,17.DOI:10.7638/kqdlxxb-2024.0054
高速来流下逆向射流长短穿透模态减阻防热机理
Drag and heat reduction mechanism in long and short penetration modes of opposing jet under high-speed flow
摘要
Abstract
Opposing jet technique,as an active flow control method,has the potential for efficient drag and heat reduction in high-speed vehicles.To investigate the drag and heat reduction mechanism of the opposing jet in different typical flow modes,the surface pressure coefficient and adiabatic cooling efficiency are numerically calculated for a blunt body featuring an opposing jet orifice,under an incoming flow of Ma=10,at different jet stagnation pressure ratios(PsR=0～6.0).The results show that with the increase of PsR,the opposing jet experiences three typical flow modes:unsteady short penetration mode,unsteady long penetration mode and steady short penetration mode.The unsteady short penetration mode fails to achieve effective heat and drag reduction and should be avoided.The unsteady long penetration mode achieves high drag reduction at low PsR values,attributable to the reduced interface cone apex angle brought by the longer bow shock stand-off distance,however,its heat reduction performance is compromised due to increased mainstream aero-heating from the sharpened interface structure and reduced opposing jet total enthalpy.In the steady short penetration mode,increasing PsR enhances drag reduction by decreasing the interface cone apex angle and increasing the bow shock stand-off distance,while heat reduction improves due to reduced mainstream aero-heating at the interface and increased opposing jet total enthalpy.Although the long penetration and short penetration mode show different drag and heat reduction characteristics,their intrinsic physical mechanisms of drag and heat reduction are consistent.The steady short penetration mode is more suitable for addressing the challenges of high aerodynamic drag and heating in hypersonic flight.关键词
高速流动/减阻防热/逆向射流/长穿透射流模态/短穿透射流模态Key words
high-speed flow/drag and heat reduction/opposing jet/long penetration mode/short penetration mode分类
航空航天引用本文复制引用
许浩楠,李建飞,李雪英,任静..高速来流下逆向射流长短穿透模态减阻防热机理[J].空气动力学学报,2025,43(12):64-80,17.基金项目
国家自然科学基金委面上项目(52476031) （52476031）
