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航空轮胎爆破时受内压释放的影响,爆破碎片的速度会有明显增加,而非与适航标准规定的与轮胎降落时的胎速相同。利用Fluent中用户自定义函数编写动力响应程序,采用动网格和用户自定义函数相结合的方法,展开内压释放作用下的轮胎爆破碎片速度动力响应特性的数值模拟研究。假设轮胎爆破失效是存在先前缺陷造成的,将碎片受冲击后的动态过程分解为内压释放冲击加速阶段和以一定初速度在空气阻力下减速运动两个阶段,提出仅考虑碎片两侧实时压力差作为动力源的简化物理爆破模型,来分析碎片的速度受内压作用的响应和整个流场压力以及速度变化情况,弥补了数学模型未考虑内外压平衡过程的不足,为预测轮胎爆破后碎片获得能量和爆破气流能量等提供数值参考,以便提出相应的安全防范措施。
The impact of burst pressure on aircrafts during blasting is significantly increased, not at the same rate as the airworthiness standards provide for tire landing. Using Fluent user-defined function to write dynamic response program, a dynamic mesh and user-defined function are combined to develop the numerical simulation research on the dynamic response of tire burst velocity under internal pressure release. It is assumed that the failure of the tire is caused by the previous defects. The dynamic process after the impact of the fragment is decomposed into two stages: the acceleration of internal pressure release and the deceleration of air resistance at a certain initial velocity. It is proposed that only the real-time pressure Poor as a power source to simplify the physical blasting model to analyze the speed of the debris by the internal pressure response and the entire flow field pressure and speed changes to make up for the mathematical model does not take into account the internal and external pressure balance process deficiencies for the prediction of the tire after blasting fragments Access to energy and blasting airflow energy to provide numerical reference, in order to put forward the corresponding safety precautions.