关键词: 单级入轨;氢氧发动机;推进剂混合比;三元推进剂

Abstract: The variable mixture ratio hydrogen fuel rocket and tripropellant engine for SSTO were discussed.The ordinary and aeropike engines were discussed too.In previous works,some were made too many simplification and some were only analysed dual mixture ratio rocket,so they couldn′t reflect the influence made by variable mixture ratio rocket really.We discuss the optimal mixture rutio process during ascent based on trajectory optimization.The percents of propellant when using tripropellant engine were also discussed.The simplification made in analysis is reasonable

Key words: Single stage to orbit;Hydrogen oxygen engine;Propellant mixture ratio;Tripropellant