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对带凹腔结构的燃烧室二维甲烷燃烧流场进行数值模拟,采用迎风三阶精度MUSCL格式求解二维含组分守恒N-S方程,湍流模型采用剪切修正的RNG k-ε湍流模型,分别分析了凹腔不同长深比和导流槽结构对燃料燃烧的影响.对喷甲烷燃烧工况进行了计算研究,结果表明:凹腔可以提高燃烧效率,却使总压恢复系数降低;凹腔的长深比越大,燃烧效率越高,总压恢复系数越低;导流槽可以在总压恢复系数较高的情况下进一步提高燃烧效率.
The numerical simulation of two-dimensional methane combustion flow in a combustor with a cavity structure was performed, and the two-dimensional conservative fractional-NS equations were solved by using the third-order windward accuracy MUSCL scheme. The turbulence model was modified by the shear-corrected RNG k-ε turbulence model, The effects of different aspect ratio and diversion channel structure on the combustion of fuel were analyzed. The combustion conditions of the injected methane were studied. The results show that the cavity can improve the combustion efficiency and reduce the total pressure recovery coefficient. The larger the aspect ratio, the higher the combustion efficiency, and the lower the total pressure recovery coefficient. The guide groove can further improve the combustion efficiency under the condition of a higher total pressure recovery coefficient.