某型号燃气发生器故障的仿真再现

Simulation reappearance of a certain type of gas generator's failure

为对某次失败的火箭发射过程进行故障分析,本文对可能的故障情况进行了数值仿真研究。根据飞行过程的故障现象及箭载测量数据分析了可能的故障原因,并根据燃气发生器的特点对该燃烧室内雾化、燃烧过程进行了数学建模和数值仿真。根据可能的故障情况进行了逐一的数值仿真和结果分析,并与有限的箭载数据进行了对比。结果表明:采用该数学模型能够很好地对火箭发射过程中的故障进行再现;该型号的燃气发生器存在一定的设计缺陷,需要进行设计优化;扰流环倾斜是此次飞行最有可能的故障情况。

To meet the needs of failure reappearance of a certain rocket launching, the present research studied the conceivable failure condition by the method of numerical simulation. Firstly, the conceivable failure reasons were analyzed based on the failure phenomenon and the measure data from rocket. Then, the processes of the atomization and the combustion were numerically modeled and simulated, which was based on the performance of the gas generator. Next, .the possible failure conditions were simulated one by one, and the results were compared with the limited data from the rocket. The conclusions are as follows ： the numerical model proposed can simulate the rocket launching failure very well ; the gas generator involved has some design objection, and needs to be optimized in design; the askew turbulent flow annulus is the most possible failure of this rocket launching.