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为了研究液体推进剂的撞击雾化问题,采取光滑粒子流体动力学方法 (SPH)进行了射流撞击形成液膜过程的数值模拟。修正了基于连续表面力模型的表面张力算法,推导了考虑粘性与表面张力作用的SPH形式的控制方程,对撞击雾化模型进行了合理简化,采用水作为推进剂模拟液。得到了不同撞击速度、角度下的液膜图像及液膜的形成过程图像。证明了SPH方法适于解决存在自由表面及大变形的射流撞击问题。
In order to study the impact atomization problem of liquid propellants, the numerical simulation of liquid film formation by jet impact was carried out by the method of smooth particle hydrodynamics (SPH). The surface tension algorithm based on the continuous surface force model was modified. The governing equations of SPH, which considered the effect of viscosity and surface tension, were deduced. The impact atomization model was reasonably simplified and water was used as the propellant simulation liquid. The images of the forming process of the liquid film and the liquid film at different impact velocities and angles were obtained. The SPH method is proved to be suitable for solving the jet impact problem with free surface and large deformation.