小偏差分析法在冲压发动机直连模拟试验中的应用

依据某给定几何尺寸亚燃冲压发动机的结构和性能参数,通过简化冲压发动机数学模型,理论推导了发动机直连试验模拟参数与推力之间的关系。针对其典型试验状态和工作特性,采用小偏差分析法计算了不同模拟参数及其组合对发动机推力和空气流量的影响结果。在此基础上,重点分析了不同模拟参数对发动机调节、高度和速度特性的影响规律,说明了模拟方法的合理性。该分析方法对固体冲压和液体冲压发动机地面直连试验性能评估具有一定指导意义。

Implemention of differential analysis method in direct-connect test of ramjet combustor

According to the structure and performance parameters of the ramjet with given geometries, the correlations of simu-lation parameters in direct-connect tests with the thrust of ramjet were found by simplifying mathematic model of ramjet. The effects of different simulation parameters and their combinations on thrust and airflow were investigated by differential analysis method based on the typical work conditions of ramjet. Furthermore, the dependence of characteristic performances of ramjet regulation, fly-ing altitude and flying velocity on different simulation parameters were emphatically analyzed. This analysis method is significant for evaluating the performances of direct-connect test for solid fuel and liquid fuel based ramjet.