1.引言欧洲运载火箭“阿里安”第三级亦称H8(图1),其主要特点是采用液氢/液氧高能推进剂。这种低温推进剂对提高整个运载火箭的有效载荷能力影响很大。为了得到最大的效率,新型发动机系统的研究人员要尽量采用先进工艺;同时,为了降低成本,在研制过程中要避免冒太大的风险。 1. Introduction The third stage of the European launch vehicle “Arian”, also known as H8 (Figure 1), is characterized by the use of liquid hydrogen / liquid oxygen high-energy propellants. Such cryogenic propellants have a significant impact on increasing the payload capacity of the entire launch vehicle. In order to get the maximum efficiency, researchers in new engine systems should try their best to adopt advanced technology. In the meantime, in order to reduce costs, too much risk should be avoided in the development process.