带活门轴对称变截面管道中强激波的传播特性  

Characteristics of intense shock wave propagation in axis-symmetric variable-sectional pipe with valve

作　　者：王双连[1] 郭乙木[1] 陶伟明[1] 许平聪[2] 

机构地区：[1]浙江大学力学系,浙江杭州310027 [2]浙江大学科技开发总公司,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2001年第5期540-545,共6页Journal of Zhejiang University：Engineering Science

摘　　要：研究了核爆炸环境下带活门轴对称变截面管道中非理想气体激波的传播特性 ,并讨论了在其传播过程中电离和离解效应的影响 .通过利用 TVD格式和时变非均匀网格对模型进行的数值模拟表明 ,在理想模型中波前压强的变化不会对无量纲结果产生影响 ,但在非理想模型中却会导致无量纲结果的较大变化 ,而且入射激波的波峰越陡 ,到出口处波峰被抹平的幅度越大 ,活门的消波效果理想 .通过对一维和二维计算结果的比较指出了一维计算的缺陷所在 ,而数值计算和近似估算结果的比较验证了近似估算公式的正确性 .The characteristics of shock wave propagation in non-ideal gas in an axis-symmetric variable-sectional pipe with valve under nuclear explosion were studied, and the effects of ionization and dissociation of air on shock wave propagation were analyzed by numerical results due to the TVD form and time-variant non-uniform mesh. It is shown that the pressure from the wave front have little effect on shock wave propagation in ideal gas, but much effecton non-ideal gas when the model is changed into the non-dimensional one. The sharper the shape of the incoming shock wave is, the more the energy of the shock wave loses. In the last section, the numerical results are compared with the simulation ones to show the validity of the proposed formula for estimating the value of the flow field and some restrictions of the one-dimensional model are also presented.

关 键 词：激波 非理想气体 变截面管道 TVD格式 

分 类 号：O354.5[理学—流体力学]