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研究了随着燃烧室进口马赫数不断提高时单板环形分配器式扩压器的总压损失、静压恢复和扩压器流态问题。采用计算流体力学(CFD)方法,对矩形分配器式扩压器进行数值模拟,将其结果与矩形分配器式扩压器试验结果对比,得出边界条件设置方法,对单板环形分配器式扩压器进行了数值模拟。燃烧室进口马赫数从0.291增加到0.420。结果表明:矩形分配器式扩压器的数值模拟结果与试验结果较为吻合,误差在±5%之内;随着燃烧室进口马赫数的不断提高,单板环形分配器式扩压器的性能下降。在马赫数高达0.420时,单板环形分配器式扩压器内流动没有分离,静压恢复为0.870,总压损失为1.346%,表明其性能比短突扩扩压器的性能好,在一定程度上能够满足下一代先进燃气轮机燃烧室对扩压器的要求。
The problem of total pressure loss, static pressure recovery and diffuser flow regime of a single annular distributor diffuser with increasing inlet Mach number of the combustion chamber was investigated. Computational fluid dynamics (CFD) method was used to simulate the rectangular distributor diffuser, and the results were compared with those of the rectangular distributor diffuser. The boundary condition setting method was obtained. The diffuser is numerically simulated. The Mach number of the combustion chamber increased from 0.291 to 0.420. The results show that the numerical simulation results of the rectangular distributor diffuser are in good agreement with the experimental results and the error is within ± 5%. With the continuous improvement of the inlet Mach number of the combustion chamber, the performance of the single annular distributor diffuser decline. At Mach number up to 0.420, the flow in the single annular distributor diffuser was not separated, the static pressure recovery was 0.870 and the total pressure loss was 1.346%, indicating that its performance was better than that of the short expansion diffuser. To the extent that the next generation of advanced gas turbine combustor can meet the requirements of the diffuser.