斜流形環状ディフューザの性能に及ぼす入口速度分布の影響

概要

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One of the important factors affecting the diffuser flow and performance is the shape of the inlet velocity profile. Experiments have been performed to investigate the influence of asymmetric uniform shear inlet velocity profiles on the flow and performance in mixed-flow type conical walled annular diffusers, that consists of the circular inlet cross-sectional portion and conically diverging inner and outer walls having the same cone angle. When the inlet core region flow has asymmetric shear, the flow in the diffuser deviates toward the same side as the highest velocity side at the inlet with increasing the shear ratio in the inlet core region. In this case, the pressure on the inner and outer walls varies circumferentially. The intensity of the shear in the inlet core region remains nearly constant also in the core region in the diffuser. Pressure recovery reduces markedly with an increase in the inlet shear ratio for the diffusers of cone angle smaller than about 40 degrees. For the diffuser having a larger cone angle than about 76 degrees, the inlet shear does not effect the pressure recovery.
一般社団法人日本機械学会の論文
1989-02-25