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

Masahiro Ishida; Daisaku Sakaguchi; Hironobu Ueki

doi:10.1115/1.1328084

Journal of Turbomachinery | Volume 123 | Issue 1 | TECHNICAL PAPERS

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TECHNICAL PAPERS

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

Masahiro Ishida, Daisaku Sakaguchi and Hironobu Ueki

[+] 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

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References

Figures

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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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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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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Ishida M, Sakaguchi D, Ueki H. Suppression of Rotating Stall by Wall Roughness Control in Vaneless Diffusers of Centrifugal Blowers. ASME. J. Turbomach. 2000;123(1):64-72. doi:10.1115/1.1328084.

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

References

Figures

Meridional section of test blower and impeller

Change in impeller characteristics due to tip clearance

Measured hub-to-shroud velocity distribution in vaneless diffuser (ϕ=0.131, λ=0.147): (a) radial component; (b) tangential component

Velocity component profiles in three-dimensional boundary layer

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)

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)

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

Effect of locally rough wall on diffuser pressure recovery (ϕ=0.15, λ=0.029, ΔVu/Vum=±0.02,ΔVm/Vmm=0)

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

Schematic relation between polar diagram of velocity vector and wall shear stress vector in case with three-dimensional separation

Calibrated friction coefficient of “G40” sandpaper

Rough wall position on the vaneless diffuser wall

Change in blower characteristics due to wall roughness control (λ=0.147)

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

Comparison of measured turbulence intensity distribution between smooth and rough walls (ϕ=0.131, λ=0.147, R=1.57)

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)

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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