基于Simulink的延伸喷管燃气展开过程联合仿真

Co-simulation on extending process of extendible nozzle using gas generator based on Simulink

为进一步优化作动筒式双级延伸喷管的设计参数,需要对延伸喷管展开的全过程进行更加细致的分析与仿真。针对作动筒式双级延伸喷管采用燃气发生器展开的工况,通过在Matlab/Simulink中构建燃气发生器内药柱燃烧与作动筒内燃气的膨胀做功模型,结合Ansys动力学仿真模块,对延伸喷管从燃气发生器点火开始到延伸喷管展开到位的全过程进行联合仿真。将仿真结果与试验数据对比,证明了模型可以较为准确地预测出工作过程中作动筒内压强的峰值、展开到位时压强值以及燃烧完毕时作动筒残压值,最大误差约10%。仿真结果表明,建立的燃烧-传递-做功-展开的模型合理可靠,可较为准确地预估出燃气发生器药量变化对延伸喷管展开动力学参数的影响,具有较强的工程应用价值。

In order to optimize the design parameters of the extendible nozzle with actuator,it is necessary to analyze the whole process of the extendible nozzle more carefully.For the condition of extendible nozzle using gas generator,the model including the combustion process of grain and the extending process of gas in Matlab/Simulink was builded.Combine with dynamic simulation module in Ansys,a co-simulation was carried out for the overall process of nozzle expanding.Compared with the experimental data,it is proved that the model can accurately predict the maximum pressure during the working process,the value of pressure when the actuator is deployed in place and the residual pressure value at the end of combustion.The maximum error is about 10%.The simulation results show that the combustion-flow-work-extending model established in this paper is reasonable and reliable,and can accurately predict the influence of gas generator charge change on the dynamic parameters of extended nozzle deployment,which has strong engineering application value.