前言随着宇航事业的发展,为了满足各种飞行任务的需要,要求液体火箭发动机的性能不断提高,一级助推器的推力不断加大,工作时间不断加长,有的还要求多次重复起动。例如美国航天飞机主发动机要求能重复工作100次,累计工作时间7.5～10小时。国外几种主要发动机的设计工作寿命和起动次数见表1。 Preface With the development of aerospace industry, in order to meet the needs of a variety of missions, the performance of liquid rocket engines is required to continuously improve. The thrust of a booster is continuously increased, the working time is lengthened, and some require repeated starting . For example, the main engine of the U.S. space shuttle requires repeated work of 100 times and a total working time of 7.5 to 10 hours. Several major foreign engine design work life and start the number of times in Table 1.