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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical study on simultaneous thermodynamic and hydrodynamic mechanisms of underwater explosion
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Numerical study on simultaneous thermodynamic and hydrodynamic mechanisms of underwater explosion

机译：水下爆炸同时热力学和流体动力机制的数值研究

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In this study, we numerically investigate the simultaneous thermodynamic and hydrodynamic mechanisms of underwater explosion (UNDEX). Bubble explosion in water at the collapsing stage is extremely violent and becomes extraordinarily hot, exceeding 1,000 K. The evolution of the bubbles and temperature fields are simulated using a fully compressible mixture model. The deformable bubble and the heat transfer of the internal explosive gas are captured with higher accuracy compared with published data. First, a spherical bubble that collapses and rebounds without the effects of gravity is computed to verify the accuracy of the model. The numerical results in terms of the bubble radius and temperature fields are consistent with analytical solutions based on the Rayleigh-Plesset equation. Next, a real 5.2 g trinitrotoluene UNDEX experimental case is simulated, in which the formation of a non-spherical bubble with a non-symmetric thermal boundary layer is analyzed. An excellent agreement between bubble motions and experimental data is obtained. The temperature inside the collapsing bubble increased significantly, reached a maximum value of approximately 2,000 K at its final stage, and then decreased rapidly. In addition, a spatially non-uniform temperature field and a thicker thermal boundary layer along the jet direction at the collapse stage are observed. Furthermore, a case study is conducted to estimate the bubble dynamics of non-isothermal and isothermal cases. Finally, the effects of the initial equilibrium gas temperature and water temperature on the thermodynamic and hydrodynamic mechanisms of UNDEX are investigated in detail. An approximate non-linear relation is proposed to describe the relationship among the important parameters.
机译：在这项研究中，我们在数值上研究了水下爆炸（UNDEX）的同时热力学和流体动力机制。坍塌阶段的水中的泡沫爆炸极其暴力，变得非常热，超过1,000克。使用完全可压缩的混合物模型模拟气泡和温度场的演变。与已发布的数据相比，可变形气泡和内部爆炸气体的传热以更高的精度捕获。首先，计算折叠和篮板而不会对重力的影响的球形气泡来验证模型的准确性。气泡半径和温度场的数值结果与基于瑞利 - Plesset方程的分析溶液一致。接下来，模拟真实的5.2g三硝基甲苯二烯索诺实验盒，其中分析了具有非对称热边界层的非球形气泡的形成。获得泡沫运动和实验数据之间的良好一致性。坍塌气泡内的温度显着增加，最终阶段达到约2,000k的最大值，然后迅速下降。另外，观察到在崩溃阶段沿着射流方向的空间上不均匀的温度场和较厚的热边界层。此外，进行案例研究以估计非等温和等温病例的泡沫动态。最后，详细研究了初始平衡气体温度和水温对undex热力学和流体动力学机制的影响。提出了一种近似的非线性关系来描述重要参数之间的关系。

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