弹射救生过程数值计算及损伤风险评估

针对从弹射程序启动到飞行员着陆之间的各个阶段,建立了能够对横滚、俯冲等复杂弹射条件进行计算的数学模型。结合某型座椅的具体参数与气动力数据,针对具体算例求解了弹射救生过程,与实验结果进行了对比。根据模型的计算结果,以动态响应指数(DRI)对不同弹射初速下的损伤风险做出评估,并指出了在不同速度下气动过载的影响。

Numerical calculation of ejection process and injury crisis evaluation

A series of math models were built to describe different movement phases and forces during the whole working process of ejection seat,from the very beginning of ejection process to the pilot's landing on earth.These models were based upon flight mechanics equations,parachute theory equations,experimental data and CFD data,and could take intoconsideration complicated initial ejection conditions such as rolling and diving.The working process of some ejection seat was calculated with respect to its specific parameters and aerodynamic force.The result of numerical calculation was contrasted with experimental data.The aerodynamic force's impact on pilot at different velocities was analyzed,and DRI model was employed to predict the injury crises of the ejection seat under different initial ejection condition.The result revealed that catapult and rocket could cause moderate and high injury risk to pilot,and aerodynamic force could cause high injury risk when the initial velocity of fighter was greater than 850 km/h.