反旋进气混合式减涡结构流动特性数值计算

提出了一种将反旋进气孔与减涡管相结合的混合式减涡器,数值研究了其减阻引气效果,分析了旋转雷诺数、无量纲入口质量流量对内部流场结构和压力损失的影响。研究发现:在混合式减涡器引气结构中,静压沿径向平缓降低,在周向分布均匀;随着无量纲入口质量流量或旋转雷诺数的增加,引气结构总压降呈现单调上升的趋势,其中在高旋转雷诺数、低无量纲质量流量工况下具有突出的减阻性能,其对应的湍流参数为0.106 4~0.324 5。相比于简单盘腔,反旋进气孔式及管式减涡器的压力损失分别降低62.5%、60.5%,混合式减涡器可降低80.4%,体现出良好的减阻引气效果。 

Numerical calculation of flow characteristics of hybrid vortex reduce structure combing de-swirl inlet

A hybrid vortex reducer combining the de-swirl inlet hole and the vortex tubes was proposed, the effect of drag reduction and bleed air was numerically studied, and the effects of rotating Reynolds number and dimensionless inlet mass flow on internal flow field structure and pressure loss were analyzed. It was found that in the inflow structure of the hybrid vortex reducer, the static pressure decreased gently in the radial direction and was evenly distributed in the circumferential direction. With the ascension of the dimensionless inlet mass flow or the rotating Reynolds number, the total pressure drop of the inflow structure showed a monotonous increasing trend. Especially, under the conditions of higher rotating Reynolds number and lower dimensionless mass flow, outstanding drag reduction was observed and the corresponding turbulence parameter range of 0.106 4-0.324 5 was obtained. Compared with the simple disk cavity, the pressure loss of the de-swirl vortex reducer and the tube vortex reducer was reduced by 62.5% and 60.5%, respectively, and the hybrid vortex reducer can reduce the pressure loss by 80.4%, showing a better drag reduction.