有相变的水下超音速燃气射流数值模拟

摘要

In order to study the complex phase transformation process of underwater solid rocket motor, the criterion of evaporating⁃condensing process and simulation model were established based on the thermoxynamic principles. We developed a simulation model of the complicated processes of supersonic jets according to thermodynamic princi⁃ples. We obtained the numerical transmission processes of heat and mass by modifying the source item of the basic equations in the volume of fluid ( VOF) model. The simulation results agreed with those of the experiment, thus confirming the feasibility and reliability of using the proposed model for phase transition processes. We also simula⁃ted the phase transformation process of the model under typical working conditions and analyzed gaseous jets charac⁃terized by high temperature and high speed underwater. The results show that the model has good applicability in solving phase transition problems in complex conditions, and can be helpful in addressing relevant engineering problems.%为了对水下固体火箭发动机典型具有相变过程的复杂流动问题进行研究，本文依据水－蒸汽相变的热力学原理，建立了蒸发－冷凝过程的判别标准，设计了一种解决水下超音速燃气射流复杂相变过程的计算模型。根据VOF（ volume of fluid）模型原理，通过对基本方程的源项进行修改实现了相变的数值传质、传热过程。经过实验与数值模拟结果的对比分析，验证了该计算模型仿真结果的可行性和可信度，运用该模型完成了典型工况的水下高温、高速燃气射流问题中相变过程的仿真计算，并对其过程进行了分析。仿真结果表明：该模型对解决复杂工况下的相变为题具有很好的适用性，可以为相应的工程问题提供很好的帮助。