关键词: 超音速进气道;支板;前掠;后掠;混合掠

Abstract: Three kinds of sidewall compression scramjet inlets with aft,forward and Aft-Forward strut-sweeping configuration were numerically investigated.These scramjet inlets were operated in Mach number 4~6.The flow fields,shock wave structure,turbulence boundary layer development and overall performance characteristics of different scramjet inlet configuration were analyzed.It is concluded that:(1) Aft strut-sweeping inlet can possess wide operation Mach number range with small inner contraction ratio and the large spillage.Upstream displacement of inlet lip can reduce the spillage rate but lead to stronger reflecting shock on the top wall,which increases total pressure loss and flow distortion at the inlet exit;(2) Forward strut-sweeping inlet can ensure large mass flow rate coefficient and total pressure recovering factor,but is difficult to start at low mach number;(3) the aft-forward strut-sweeping inlet,inheriting both advantages of Aft and Forward strut-sweeping inlets,can have a more favorable performance than solely Aft or Forward strut-sweeping inlets,which can be further enhanced by adjustments of forward/aft strut position,cowl shape and compressing angle as well as shock wave structure.

Key words: Supersonic inlet;Strut;Aft sweep;Forward sweep;Aft-forward sweep