【摘要】 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.更多还原

【Abstract】 The flow fields in scramjet combustion chamber with cavities were simulated numerically by using the element-conservation Navier-Stokes equations with the RNG k-ε two-equation turbulence model.The efficiency of fuel burning for different ratio of length to depth and different slot structure was analyzed.The conclusions were as follows: the combustion efficiency was enhanced by the cavity,but the total pressure recovery was reduced;the bigger the ratio of length to depth was,the higher the combustion efficiency was,and the lower the total pressure recovery was;the combustion efficiency was improved with high total pressure recovery for slot.更多还原