进口速度分布对短突扩压器性能的影响

Influence of Inlet Velocity Distribution on Dump Diffuser Performance

在任意曲线坐标系下，对环型燃烧室的三维流场进行了数值计算，研究了四种不同的进口速度分布对扩压器性能的影响。计算结果表明，进口速度大小和方向都对扩压器性能有重要影响，进口速度分布均匀以及方向贴近扩压器壁面，有利于提高扩压器的性能。计算中采用标准ｋ－ε双方程紊流模型，采用控制容积法进行离散。

The flow field of an annular combustor is calculated in arbitrary curvilinear coordinates,in which the standard k ε turbulence model, the SIMPLE algorithm and a non staggered are employed. The effect of the inlet velocity distribution on the performance of the diffuser is studied. Four kinds of the inlet velocity profiles are considered.The results indicate that not only the magnitude of velocity but also the direction of velocity has an important effect on the performance of the diffuser. Unified inlet velocity and the direction of flow parallel with the wall of the diffuser may improve the performance of the diffuser.