复合固体推进剂静电危险性数值模拟

建立了一维非稳态传热、传质、裂纹扩展方程,对复合固体推进剂在静电激励下的危险性反应过程进行了数值模拟研究。计算了使一种HTPB推进剂发生危险的临界放电能量为0.74 J,与文献报道值0.76 J接近,说明本数值计算模型比较准确。在模型验证的基础上,考察了某推进剂的特征参数,如断裂韧性、裂纹扩展速度、固相分解热、燃速及静电放电时间对该推进剂发生危险时的临界放电能量和功率的影响规律。研究表明,放电时间、断裂韧性、裂纹扩展速度、燃速对推进剂发生危险变化的临界能量影响较大,断裂韧性越大、裂纹扩展速度越低、燃速越高的推进剂越容易在静电激励下发生危险。

Numerical simulation of electrostatic hazards of composite solid propellant

One dimension unsteady equation of heat and mass transfer,crack propagation equations were established to simulate the electrostatic hazard process of composite solid propellant.The calculation result shows that the critical electrostatic discharging energy to ignite a HTPB propellant is 0.74 J,which fits the reported value 0.76 J well.The model was proved to be correct.Based on the model verification,the effects of propellant properties,such as fracture toughness,crack propagation velocity,heat of vaporiza...