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TECHNICAL PAPERS

Suppression of Rotating Stall by Wall Roughness Control in Vaneless Diffusers of Centrifugal Blowers

[+] Author and Article Information
Masahiro Ishida, Daisaku Sakaguchi, Hironobu Ueki

Department of Mechanical Systems Engineering, Nagasaki University, Nagasaki 852-8521, Japan

J. Turbomach 123(1), 64-72 (Feb 01, 2000) (9 pages) doi:10.1115/1.1328084 History: Received February 01, 2000
Copyright © 2001 by ASME
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References

Figures

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Calibrated friction coefficient of “G40” sandpaper
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Rough wall position on the vaneless diffuser wall
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Change in blower characteristics due to wall roughness control (λ=0.147)
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Comparison of measured and calculated velocity distributions between smooth and rough walls (ϕ=0.131, λ=0.147, R=1.57, ΔVu/Vum=±0.02, ΔVm/Vmm=0 for calculation): (a) measured result; (b) calculated result
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Comparison of measured turbulence intensity distribution between smooth and rough walls (ϕ=0.131, λ=0.147, R=1.57)
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Comparison of diffuser pressure recovery between the cases with and without rough wall at design flow rate (ϕ=0.27, λ=0.147, ΔVu/Vum=±0.02, ΔVm/Vmm=0 for calculation)
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Effect of locally rough wall on velocity and flow angle at hub side in case without three-dimensional boundary layer separation (ϕ=0.27, λ=0.147, ΔVu/Vum=±0.02,ΔVm/Vmm=0): (a) tangential and radial components of velocity; (b) flow angles of main-flow and wall-limiting streamline
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Calculated radial velocity contour in vaneless diffuser under asymmetric inlet main-flow condition (ϕ=0.15, λ=0.029, ΔVu/Vum=±0.02, ΔVm/Vmm=0)
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Comparison of calculated wall-limiting streamline flow angles between symmetric and asymmetric main-flows (ϕ=0.15, λ=0.29, ΔVu/Vum=±0.02, ΔVm/Vmm=0 for asymmetric main-flow)
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Effect of wall friction on three-dimensional separation and diffuser pressure recovery (ϕ=0.15, λ=0.029, ΔVu/Vum=±0.02,ΔVm/Vmm=0): (a) change in wall-limiting streamline flow angle at hub side; (b) change in diffuser pressure recovery
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Effect of locally rough wall on diffuser pressure recovery (ϕ=0.15, λ=0.029, ΔVu/Vum=±0.02,ΔVm/Vmm=0)
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Effect of locally rough wall on velocity and flow angle at hub side in case with three-dimensional boundary layer separation (ϕ=0.15, λ=0.029, ΔVu/Vum=±0.02,ΔVm/Vmm=0): (a) tangential and radial components of velocity; (b) flow angles of main-flow and wall-limiting streamline
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Schematic relation between polar diagram of velocity vector and wall shear stress vector in case with three-dimensional separation
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Meridional section of test blower and impeller
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Change in impeller characteristics due to tip clearance
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Measured hub-to-shroud velocity distribution in vaneless diffuser (ϕ=0.131, λ=0.147): (a) radial component; (b) tangential component
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Velocity component profiles in three-dimensional boundary layer

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