具有液体相变过程的发散冷却数值研究

Numerical Investigation of Transpiration Cooling with Liquid Phase Change

液体冷却介质具有相变潜热高、储存空间小、输送能耗低的优点,因此在航空航天热防护研究领域越来越受到重视。采用两相混合模型(Two-phase Mixture Model,TPMM),对一维稳态具有液体相变过程发散冷却问题进行了数值研究。研究发现:最大温度梯度出现在气相区以及液相区向两相区过渡处,多孔骨架的孔隙率和特征尺寸影响相变过程和冷却效果。最后,着重讨论了TPMM中第二个假设对于研究具有液体相变过程发散冷却问题的适用性。

Liquid coolant is attracting more and more attention in the field of aerospace thermal protection, due to its high latent heat, small storage space and low energy consumption in transport. A numerical investigation of one-dimensional and steady state transpiration cooling problem with liquid phase change is carried out by the Two-phase Mixture Model （TPMM）. The numerical results indicated that the maximum temperature gradients are in the gaseous region and the transition region from liquid to two-phase, and the cooling effect and phase change pro- cess are dependent on the porosity and characterization size of porous matrix. Finally, the applicability of the second assumption in TPMM for the investigation of transpiration cooling problem with liquid phase change is discussed in detail.