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为了对超声速高温燃气射流的注水降温机理进行探索,对该类流场进行了数值模拟和实验研究。气-液两相流场采用Mixture多相流模型进行计算,液态水的汽化过程通过耦合水的汽化方程来模拟。实验现象采用高速摄影和红外热像仪进行拍摄,并且在冲击平板上布置了热电偶温度测点。通过对仿真计算得到的温度云图与实验结果进行比较发现,无论是流场形态还是温度场分布,两者都十分吻合,证明了计算模型的适用性。结果表明:液态水和燃气的掺混汽化吸热效果显著,高温区域由于注水影响缩小到一个类锥形区域;迎气面温度大大降低,热冲击烧蚀效应得到有效缓解,尤其是中心部位降温效果最为明显,注水后温度仅为原温度值的60%左右。
In order to explore the mechanism of water injection cooling in supersonic high temperature gas jet, this kind of flow field is simulated and experimentally studied. The gas-liquid two-phase flow field is calculated using the Mixture multiphase flow model, and the vaporization of liquid water is simulated by the vaporization equation of coupled water. The experimental phenomenon was shot with high-speed photography and thermal imaging camera, and thermocouple temperature measuring points were arranged on the impact plate. By comparing the calculated temperature and simulation results, it is found that both the flow field and the temperature field agree well with each other, which proves the applicability of the calculation model. The results show that the heat absorption effect of liquid water and gas is remarkable. The high-temperature region shrinks to a cone-like area due to the influence of water injection. The air temperature is greatly reduced, and the thermal shock and ablation effect is effectively relieved, especially in the central part The effect is most obvious, the water temperature is only about 60% of the original temperature after water injection.