Alternate Blade Stall and Rotating Stall in a Vaned Diffuser

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概要

• 論文の詳細を見る

• Flow instability in a vaned diffuser with an even number of blades was examined experimentally and analytically. In the experiments, an alternate blade stall, an asymmetric stall, and two types of rotating stalls (backward/forward rotating stall) 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. With increasing the clearance, the forward rotating stall also occurred, and the onset of rotating stall shifted toward the higher flow rate corresponding to the pressure performance in the vaned diffuser. Simple 2D stability analysis showed that the impeller/diffuser clearance affects the speed and direction of the stall propagation, and the slope of the diffuser pressure performance vs. flow rate curve affects fundamentally the onset of the flow instability within the diffuser.

• 一般社団法人日本機械学会の論文
• 2002-11-15

著者

• YOSHIDA Yoshiki

  Osaka University, Graduate School of Engineering Science, Division of Mechanical Science

• TSUJIMOTO Yoshinobu

  Osaka University, Graduate School of Engineering Science, Division of Mechanical Science

• Sano Takeshi

  Mitsubishi Heavy Industries Ltd. Takasago Machinery Works

• Nakamura Yuki

  Mitsubishi Heavy Industries Ltd. Takasago Research & Development Center

• Tsujimoto Yoshinobu

  Osaka University

• Yoshida Yoshiki

  Osaka University Engineering Science

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