跨/超临界条件下火焰面方程求解与分析

In this paper, based on the FlameMaster program, a trans/supercritical calculation function package is developed to solve the steady-flamelet equation under trans/supercritical conditions. Firstly, a trans/supercritical combustion model is constructed to explain the thermodynamic behavior of the transcritical fluid deviating from the ideal gas in the “pseudo-boiling” region through the cubic real fluid state equation, and the parameters such as thermodynamic properties and transport properties are modified by the real fluid effect. Then, the above model is implanted into FlameMaster and the relevant numerical methods are adjusted to ensure the stable convergence of the solver. Finally, the modified FlameMaster program was verified by a typical working condition example. On this basis, taking the trans/supercritical LOX/GH2 flame as an example, some important details and results in the process of model implementation are studied, including the difference between the results obtained by using different real fluid state equations, the deviation between the real fluid model and the ideal gas model, and the influence of grid algorithm factors on the calculation results, and the influence of different condition parameters on the flame structure is further studied by using the phase diagram method.