下保护罩对PMT水下内爆载荷特性传播影响的数值研究

Numerical Study on Influence of Protective Shield in PMT Under Water Implosion Load Peculiarity Propagation Property

考虑PMT内爆后会引起临近PMT产生连锁爆炸,以江门中微子实验中心的PMT为研究对象,通过数值计算方法研究了PMT内爆后的载荷特性,探讨了下保护罩对PMT内爆载荷特性的影响。结果表明:PMT内爆产生的压力峰值和比冲量均在传播方向呈现幂函数形式衰减,PMT内爆冲击波向Z-方向传播的冲击波强度最大;存在下保护罩的PMT内爆产生的压力峰值和比冲量在Z+方向、Z+X+方向、Z-X+方向传播时均呈现幂函数形式衰减,而在Z-方向传播时,压力峰值呈现指数形式增加,比冲量呈现线性增加;下保护罩的存在能够很好降低PMT内爆后产生的压力峰值,延迟压力峰值出现时间,但下保护罩内爆后的比冲量与无下保护罩PMT内爆后比冲量相当。

Considering PMT underwater imposion may conduce the chain explode of near PMT,we study the PMT in Jiangmen neutrino center detector structure,using numerical simulation method research the load peculiarity of PMT underwater implosion. We also study the protective shield influence on the load peculiarity of PMT explode. Result shows the peak pressure and impluse decrease in the model of power function in the propagate direction. The most strength explosive shock wave is in the direction of Z-. The shock wave strength of PMT with protective shield decrease in the model of power function in the propagate direction of Z＋,Z＋X＋and Z-X＋. However,the PMT with protective shield peak pressure shows the model of exponent increase and the impulse shows linear increase. The protective shield can decrease the peak pressure and delay the appear time of peak pressure. But it has little influence in the impulse.