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Expansion shock wave in Bethe-Zel'dovich-Thompson fluids

机译：Bethe-Zel'dovich-Thompson流体中的膨胀激波

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The fundamental derivative of gas dynamics is a measurement of the variation of the speed of sound of a gas with respect to pressure in an isentropic process. The van der Waals model is used to confirm the existence of negative fundamental derivative regions for PP25 fluid. Jump relations are investigated in three regions of the PP25, where Γ > 1,1 > Γ > 0 and Γ < 0 respectively. The non-monotone dependence of the speed of sound along a shock adiabat is demonstrated to result in the admissibility of non-ideal increase of the speed of sound across normal shock waves in the region where 1 > Γ > 0. Expansion shock solution is obtained in the region where Γ < 0. Across such a shock, density and pressure decrease with positive entropy generation. Isentropic compression fan is proved to be physically admissible in a one dimensional flow in a tube when a piston is pushing towards the fluid in the tube.
机译：气体动力学的基本导数是等熵过程中气体声速相对于压力的变化的量度。 Van der Waals模型用于确认PP25流体的负基本导数区域的存在。在PP25的三个区域中分别研究了跳跃关系，其中Γ> 1,1>Γ> 0和Γ<0。沿激振绝热体的声速非单调依赖性已被证明可导致在1>Γ> 0的区域中跨正常激波的声速非理想增加。在Γ<0的区域中。在这样的冲击中，密度和压力随着正熵的产生而降低。事实证明，当活塞朝管中的流体推动时，等熵压缩风扇在管中的一维流动中是物理上可接受的。

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