关键词: 斜置喷管;推力反向;喷管气流;计算方法

Abstract: In this paper,the unsteady and inviscid governing equations of nozzle flow are solved by explicit MacCormack scheme which can automatically catch shock waves in flow field. The physical boundary conditions and the compatibility equations along valid bicharacteristic curves and pseudo-pathline are applied to inlet and solid wall points. In order to validly catch shock waves on the solid wall, the shock waves match technique and scheme switch etc.are used for computing parameters at solid wall points.The performance calculation is based on the computated flow field. The reverse thrust is calculated by summing the thrust component due to the scarfed nozzle extension wall pressure and the basic nozzle thrust.The calculated results are in agreement with that of physical analysis. The calculated value of the geometrical contraction factor is 0.8696 for the computed example.

Key words: Canted nozzle;Thrust reversal;Nozzle flow;Calculation method