ベーンドディフューザに発生する交互翼失速と旋回失速 : 第1報, 羽根車とディフューザの間隔の影響

概要

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Flow instability in a vaned diffuser with even number of blades was examined experimentally and analytically. In experiments, alternate blade stall, asymmetric stall, and two types of rotating stall (backward/forward) were observed depending on the impeller/diffuser clearance. For narrow clearance with strong impeller/diffuser interaction, the alternate blade stall and backward rotating stall mainly occurred. As increasing the clearance, the forward rotating stall also occurred, and the onset shifted toward the high flow rate corresponding to the pressure performance in the vaned diffuser. Simple 2D stability analysis showed that the clearance between the impeller and diffuser affects the speed and direction of stall propagation, and the gradient of the pressure performance in the vaned diffuser affects the onset of the rotating stall.
一般社団法人日本機械学会の論文
2000-10-25