基于正交试验设计的姿控发动机起动特性

Numerical analysis on starting characteristics of attitude control engine based on orthogonal test design method

基于AMESim模块化仿真软件,建立了姿控发动机仿真模型,采用正交试验设计方法,分析了推进剂黏度、集液腔容积、燃烧时滞、喷注压降和阀门间隔时间等因素对姿控发动机起动响应特性的影响。结果表明:起动响应特性指标主要影响因素为燃烧时滞、喷注压降和阀门间隔时间,且对阀门间隔时间敏感性最高。室压超调量对推进剂黏性敏感性最低,响应时间对喷注压降敏感性最低。燃烧时滞越大,喷注压降越小,阀门间隔时间越大,发动机响应性能越差。优化喷嘴雾化性能以缩短燃烧时滞,适当提高喷注压降都有助于缩短姿控发动机响应时间。阀门作动时间则尽量保持一致,以缩短起动响应时间。

Based on AMESim modular simulation software, a simulation model for the attitude control engine was established.The effect of propellant viscosity, volume of liquid manifold, combustion time delay, injection pressure drop and valve interval time on the starting response characteristics of attitude control engine were analyzed by the orthogonal test design method.The results show that the main influence factors of the response characteristics are combustion time delay, injection pressure drop and valve interval time, and the sensitivity of the valve interval time is the highest.The sensitivity of chamber pressure overshoot to the propellant viscosity is the lowest, and the response time is the least sensitive to the injection pressure drop.The larger combustion time delay, the smaller injection pressure drop and the larger valve interval, the worse engine response performance.Optimizing the injector atomization performance to decrease the combustion time delay, and appropriately increasing the injection pressure drop are helpful to decrease the response time of the attitude control engine.The valve actuation time is as consistent as possible to reduce the response time of starting process.