关键词: 针栓式喷注器;液氧/甲烷发动机;推力室;燃烧特性;数值仿真

Abstract: In order to study the effects of the pintle injector structure on combustion performance of the thrust chamber of LOX/CH₄ engine， a non-adiabatic stable diffusion flamelet model considering real-fluid properties was adopted in the numerical simulation of the transcritical combustion and flow in the thrust chamber of LOX/CH₄ engine with pintle injector. The results reveal that two recirculation zones can be formed near the thrust chamber head of engine with pintle injector. When the width of the radial injection channel and the diameter of the needle decrease within a certain range， the chamber pressure and the gas temperature can be increased， and the combustion performance of the thrust chamber can be improved. In addition， for the value of the ‘skip distance’， in order to improve the combustion performance of the thrust chamber and consider the cooling of the thrust chamber head， the value of the non-dimensional ‘skip distance’ should be around 1.

Key words: Pintle injector;LOX/CH₄ engine;Thrust chamber;Combustion characteristics;Numerical simulation