Simulation of Supersonic Combustion by Assumed PDF Approach Based on IDDES Model and VODE Solver
Niu Jian;Liu Xiaoyong;Piao Ying;Beijing Power Machinery Institute;School of Aerospace,Tsinghua University;
In order to resolve the rigidity caused by chemical source term calculation,assumed PDF approach considering temperature fluctuations based on VODE solver was founded. A hybrid RANS /LES simulation of supersonic reacting mixing layer and supersonic wall jet combustion using IDDES model shows that,development of large-scale vortex structure has a significant effect on mixing and combustion.Rolling,stretching,shearing and breaking of turbulent eddy can promote the development of mixing layer. Temperature fluctuations intensify chemical reaction of reacting zone,while the inadequate mixing region having some accumulation of active species,showing that this model can accurately reflect the impact between turbulent transports and chemical reactions. Predicted species distribution has a good agreement with experiment,indicating that this method can be used to supersonic turbulent combustion.
【CateGory Index】： V231.2