某型火箭发动机水下点火缩比相似关系研究与试验

Research and Test on Scale Similarity Laws of a Rocket Engine during Underwater Ignition

摘要:

火箭发动机通过水下点火工作，使得水下航行体更具综合性能优势和灵活使用能力。对于大型发动机水下点火问题，直接开展试验的资金较大，周期较长，采用缩比试验技术是研究其性能变化规律的有效工具。通过分析火箭发动机水下点火过程，通过控制方程和缩比准则，得到火箭发动机水下点火缩比相似律及主要参数的相似关系，为某型发动机水下点火的缩比技术的开展提供理论支撑。并在此基础上，开展发动机水下点火缩比试验，得到发动机在水下不同水深的推力特性。

关键词:火箭发动机;水下点火;缩比试验;相似关系

Abstract:

Through the underwater ignition of rocket engine ， underwater vehicles could get more comprehensive performance advantages and flexible use capability. For underwater ignition of large rocket engines， direct experimental test requires large funds and a long cycle. Scale test technology is an effective means to study the performance laws. This paper analyzes the underwater ignition process of rocket engine. Through studying control equations and scaling criterion，the scaling similarity laws and the main parameter similarity relationships of rocket engines during underwater ignition are obtained，which provides a theoretical support for the scale test technology of a certain rocket engine. On this basis，the scale test of engines during underwater ignition is carried out，and the thrust characteristics of engines under different water depths are obtained.

Key words:rocket engine;underwater ignition;scale test;similarity laws