Development of Mezzo-Scale Thermo-Physical Model and Chemical Reaction Model for Supercritical Combustion Flow

采用高压下氢氧超临界燃烧流动的多尺度方法来理解热物性现象。主要研究内容包括：(1)热物性和物态方程的建立；(2)化学反应模型的修正；(3)可压缩N-S解算器的预条件改进。对于第一个任务，比较了分子动力学模拟的温度和密度饱和曲线与NIST数据的结果，以显示在小转动量子效应下的一致。对于第二个任务，对化学反应模型进行了改进，结果表明，该模型的点火延迟时间和层流火焰速度与实验数据吻合较好。对于第三个任务，采用预条件方法的可压缩流动求解器显示了求解这种低速绕圆柱和翼型流动的能力。

The multi-scale method for the hydrogen/oxygen supercritical combustion flow under high pressure is applied to understand the thermo-physical phenomena. The present study is focused on (1) the construction of thermo-physical properties and equation of state, (2) the modification of the chemical reaction model, and (3) the improvement of the compressible Navier-Stokes solver by using the preconditioning method. For the first task, the temperature and density saturation curve for the molecular dynamics simulations were compared with those for NIST data to show the agreement under the small rotational quantum effects. For the second task, the chemical reaction model was improved to show that the ignition delay times and the laminar flame velocities for the present model agreed well with the experimental data. For the third task, the compressible flow solver with the preconditioning method showed the ability to solve such the low speed flow around a cylinder and an aerofoil.