Based on the feature study of a foreign 20t class LOX/LH2 expander cycle engine, the system scheme of a 25t expander cycle engine is put forward. The main performance parameters of the 25t expander cycle engine are promoted by optimizing balance parameters and restricting the condition of the lowest temperature raise in the jacket. Also, the technology schemes of the thrust chamber and the hydrogen turbopump, together with other key technologies are briefly introduced.%通过推算国外20吨级氢氧膨胀循环发动机系统参数,获得发动机系统的关键特征,介绍25吨级膨胀循环发动机系统方案设置,通过参数平衡优化及最低夹套温升条件限制,提出25吨级膨胀循环发动机主要性能参数,并简要介绍了推力室、氢涡轮泵两大核心组件技术方案及其它需开展的关键技术.
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