后掠压缩面进气道激波特性数值研究

通过对后掠楔面及双斜切双压缩进气道进口流场数值模拟及与理论计算值对比的研究,阐述了双斜切双压缩进气道的进口流场特性,指出了设计上应遵循的准则。计算表明:后掠楔面产生的激波在楔两端面的强弱是不同的,波后气流偏角也不一样。对于双斜切双压缩进气道,进口面的流动可分成外上侧、内下侧及中间三个区域,其中外上侧区域受上压缩面的控制,内下侧区域受内压缩面的控制,中间为过渡带。外侧壁前缘后掠角及壁面内倾角由上压缩面的波后参数决定。而下侧壁前缘后掠角及壁面内倾角则由内压缩面的波后参数决定。

STUDY OF SUPERSONIC FLOW FIELD CHARACTERISTICS AT THE ENTRANCE OF DUAL- SWEPT/DUAL -RAMP INLET

The advantages and design requirements of highly integrated and stealthy airframe/inlet have led to extensive study of caret inlet featured with dual - swept/dual - ramp. This paper describes the flow field characteristics of this class of inlet and compare with analytical solutions and then outline the rules of designing this class of inlet. The calculations indicate: the oblique shockwaves strength is varied from weak to strong along the leading edge of wedge, flow direction diversion downstream of the shockwaves is also varied. The flow field at the entrance of inlet is divided into three domain; up - outer , inner - down and middle domain. Up ramp has intensive influence on outer cowl lip and inner ramp does down cowl lip of dual - swept/dual - ramp inlet.