動翼可変軸流ファンにおけるスパイク型とモーダル型旋回失速発生過程(流体工学,流体機械)

概要

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Inception patterns of rotating stall in a low-speed axial-flow fan have been investigated by measuring pressure and velocity fluctuations. These experimental measurements were carried out at two different stagger-angle settings for the rotor blades. They show that at the design stagger angle, a short length-scale stall cell known as a "spike" appears first. This stall cell then grows into a long length-scale stall cell as flow rate decreases. At the small stagger angle, a long length-scale disturbance known as a "modal" is first observed, and the modal and the spikes then induce the long length-scale stall cell. The short length-scale stall cell and the modal are first observed at the rotor tip, because the end-wall blockage at the tip becomes large. At the small stagger angle, this blockage is smaller than that at the design angle. The modal is therefore generated before the short lengthscale cells appear. It is concluded from these results that the rotating stall-inception patterns depend on the rotor stagger angle.
一般社団法人日本機械学会の論文
2004-07-25