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采用各向异性网格自适应求解技术,将其应用于DLR超燃冲压发动机燃烧室中的超燃模拟.开展了3个算例,包括采用滑移壁面条件的燃烧室冷流场模拟、采用无滑移壁面条件的冷流场模拟及采用无滑移壁面条件的反应流模拟.模拟中,各向异性网格自适应计算捕捉到了如激波、射流、边界层、火焰面等具有各向异性特征的大梯度区域,并利用各向异性网格进行了很好的加密.对比利用各向同性网格的初始流场计算,各向异性网格自适应计算使基于滑移条件、无滑移条件的冷流计算及反应流计算的网格单元数量分别下降了36.2%,36.4%和36.8%,有效降低了计算规模,而且流场大梯度区域的计算结果更准确,辨析度更好.结果表明:对于像超燃这类具有各向异性特征的问题,各向异性网格系统比各向同性网格系统有更好的计算效率及准确性,同时也表明基于Mach数场构造的各向异性网格系统可以有效应用于超燃计算.
Anisotropic mesh adaptive technique was applied to simulate the combustion of the scramjet in a DLR scramjet. Three examples were given, including the simulation of the cold flow field in the combustor using slippery wall conditions, Simulation of cold flow field without slippery wall condition and reaction flow simulation with slippery wall conditionIn the simulation, anisotropic grid adaptive calculation captures such as shock, jet, boundary layer, The anisotropic grid is used to calculate the initial gradient of the anisotropic grid and the anisotropic grid is used to calculate the initial gradient of the anisotropic grid.At the same time, The cold flow calculation and the number of grid cells calculated by reaction flow decreased by 36.2%, 36.4% and 36.8% respectively, which effectively reduced the calculation scale. The calculation results of the large gradient region were more accurate and the resolution was better. The results show that the anisotropic grid system has better computational efficiency and accuracy than the isotropic grid system, such as the one with the characteristics of anisotropy such as superalloys, and also shows that To the opposite sex Grid system can effectively be applied to calculate the supersonic combustion.