关键词: 空气喷气发动机;组合发动机;发动机阀;性能;计算

Abstract: Airbreathing engines are used for space shuttle in wide-changed flow conditions. Attransition process of two engines,a transition valve must be designed for two different engines. Thegeneral indicative mood of transition valve characteristics is discussed. The unviscous flow model andvarious loss,deviation angle models are adopted. These models can be used in design of the engines.When the valve is going to shut down, choking condition model is considered. The valvecharacteristics calculation has been done for the variable valve. These research results are useful fortheory ahalysis of transition valve for variable geometry,at off-design condition.

Key words: Air breathing engine;Combination engine;Engine valve;Performance;Computation