By positioning the completely rough wall locally on the hub side diffuser wall alone in the vaneless diffuser, the flow rate of rotating stall inception was decreased by 42 percent at a small pressure drop of less than 1 percent. This is based on the fact that the local reverse flow occurs first in the hub side in most centrifugal blowers with a backswept blade impeller. The three-dimensional boundary layer calculation shows that the increase in wall shear component normal to the main-flow direction markedly decreases the skewed angle of the three-dimensional boundary layer, and results in suppression of the three-dimensional separation. It is also clarified theoretically that the diffuser pressure recovery is hardly deteriorated by the rough wall positioned downstream of R = l.2 because the increase in the radial momentum change, resulting from reduction in the skewed angle of the three-dimensional boundary layer, supports the adverse pressure gradient.
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e-mail: hiro@net.nagasaki-u.ac.jp
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January 2001
Technical Papers
Suppression of Rotating Stall by Wall Roughness Control in Vaneless Diffusers of Centrifugal Blowers
Masahiro Ishida,
e-mail: hiro@net.nagasaki-u.ac.jp
Masahiro Ishida
Department of Mechanical Systems Engineering, Nagasaki University, Nagasaki 852-8521, Japan
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Daisaku Sakaguchi,
Daisaku Sakaguchi
Department of Mechanical Systems Engineering, Nagasaki University, Nagasaki 852-8521, Japan
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Hironobu Ueki
Hironobu Ueki
Department of Mechanical Systems Engineering, Nagasaki University, Nagasaki 852-8521, Japan
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Masahiro Ishida
Department of Mechanical Systems Engineering, Nagasaki University, Nagasaki 852-8521, Japan
e-mail: hiro@net.nagasaki-u.ac.jp
Daisaku Sakaguchi
Department of Mechanical Systems Engineering, Nagasaki University, Nagasaki 852-8521, Japan
Hironobu Ueki
Department of Mechanical Systems Engineering, Nagasaki University, Nagasaki 852-8521, Japan
Contributed by the International Gas Turbine Institute and presented at the 45th International Gas Turbine and Aeroengine Congress and Exhibition, Munich, Germany, May 8–11, 2000. Manuscript received by the International Gas Turbine Institute February 2000. Paper No. 2000-GT-461. Review Chair: D. Ballal.
J. Turbomach. Jan 2001, 123(1): 64-72 (9 pages)
Published Online: February 1, 2000
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Received:
February 1, 2000
Citation
Ishida, M., Sakaguchi , D., and Ueki, H. (February 1, 2000). "Suppression of Rotating Stall by Wall Roughness Control in Vaneless Diffusers of Centrifugal Blowers ." ASME. J. Turbomach. January 2001; 123(1): 64–72. https://doi.org/10.1115/1.1328084
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