Centrifugal Fan Performance With Inlet Clearance

Wright, Terry

doi:10.1115/1.3239656

Cited by 13 publications

(10 citation statements)

References 0 publications

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“…A non-touching seals, such as a labyrinth seal, will reduce the leakage flow rate significantly, compared with the gap that has a direct opening to the fan eye in the current design. The above conclusion agrees with what Wright found on the inlet gap in a scroll cage centrifugal blower (Wright, 1984). …”

Section: Gap Losssupporting

confidence: 82%

“…The fan shell and the ported diffuser are cut to show the internal structure. Wright (1984) studied the effects of the inlet gap between the fan and the scroll on the fan performance of a scroll cage centrifugal blower. He found that the fan performance increased when the gap size was reduced and the concept of optimum gap size was not valid.…”

Section: Air Entering the Fan Impellermentioning

confidence: 99%

“…Secondly, the cooling fan takes shaft space and a longer and thicker shaft has to be used compared to the through-flow type units. The through flow type units are used in most of the household vacuum cleaners (Wright, 1984;Wright, Tzou and Madhavan, 1984;Yu et al, 2005). Since the main air flow sucked by the working fan flows through the motor and cools the motor, the air has to be clean.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fluid Flow Analysis of a Single-Stage Centrifugal Fan with a Ported Diffuser

Li¹

2009

Engineering Applications of Computational Fluid Mechanics

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A numerical model is developed for the thermal fluid flow process in a single stage through flow type centrifugal air moving fan designed for vacuum cleaners. The model predicted data are compared with the experimental results obtained following the industry standards. The agreements between the numerical and experimental results validate the model. Quantitative energy losses in every step along the flow path are reported. Detailed flow structures and pressure distributions are presented. The air-moving performances of the fan under various conditions are explained. Suggestions on design improvement and application of the motor-fan system architecture are given.

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Section: Gap Losssupporting

confidence: 82%

Section: Air Entering the Fan Impellermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fluid Flow Analysis of a Single-Stage Centrifugal Fan with a Ported Diffuser

Li¹

2009

Engineering Applications of Computational Fluid Mechanics

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“…The rate of clearance between the impeller and the hub-side wall of the casing to the impeller outer radius s/R 2 is 0.07. The inlet clearance between the impeller and the inlet duct (suction pipe) is 1 mm (20) . The experimental rotational speed of the impeller is 3 000 rpm.…”

Section: Nomenclaturementioning

confidence: 99%

Pressure Recovery in a Centrifugal Blower Casing

Fukutomi

Itabashi²,

Senoo³

2006

JSME international journal. Ser. B, Fluids and thermal engineer

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The rate of circulating flow passing through the tongue division and the pressure recovery in the casing are investigated in a centrifugal blower, which has no diffuser and large tongue clearance. At the design point, the ratio of circulating flow rate to total flow rate at the scroll end is about 45 percent, and the pressure recovery in the scroll is about 45 percent. As the remaining 55 percent of the pressure recovery in the casing is recovered in the section between the scroll end and exit duct, this section acts as a high-performance diffuser. It is concluded that the centrifugal force produced by the secondary flow and boundary layer suction are the main causes of the large pressure recovery. Moreover, it is found that the flow conditions from the scroll toward the exit duct are closely related to the low flow rate characteristics of the blower.

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“…The RADFAN procedure was chosen for this investigation because its flexible C-type computational grid topology eases the burden of grid generation for centrifugal geometries and because of the numerical algorithm's proven accuracy and efficiency, in both steady and time-dependent problems [lS, 17, 151. Validation of the RADFAN analysis was accomplished by performing inviscid and viscous simulations of the Row through the Wright radial fan [18,19,201, and comparing the results to experimental data. To assess the ability of RADFAN to predict impeller performance at off-design flow conditions, numerical simulations were performed for the Worthington impeller [21] a t three different operating conditions, and the predicted numerical results were compared with -'…”

mentioning

confidence: 99%

Numerical simulations of flows in centrifugal turbomachinery

Dorney¹,

Davis²,

McLaughlin

1993

29th Joint Propulsion Conference and Exhibit

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NomenclatureA quasi-three-dimensional Navier-Stokes analysis h a s been extended and applied t o flows in centrifugal turbomachinery blade rows. The numerical procedure was validated using a radial fan geometry typical of those found in fossil fuels plants and air handling systems. The predicted blade loading and performance characteristics showed excellent agreement with the experimental data. The numerical analysis was then applied t o a low aspect ratio centrifugal impeller. Inviscid and viscous flow simulations were performed at three operating conditions. While steady solutions were obtained in the inviscid flow calculations, the appearance of an oscillating separation bubble on the pressure surface of the impeller necessitated that the viscous flow simulations be time dependent. By comparing the predicted and experimental circumferential distributions of the relative frame velocity and flow angle downstream of the impeller, it was hypothesized that in the experiments the end wall secondary flows energized the impeller suction surface boundary layer, making the flow locally behave like an inviscid fluid. The performance curve generated from the viscous calculations showed satisfactory agreement with the experimental data, while the inviscid calculations overpredicted the performance of the impeller. It was concluded that the physics retained in quasi-three-dimensional analysis are adequate for accurately predicting flow trends in certain types of centrifugal turbomachinery. a et I M 'I P Pr Re v, w P P K P3 P T e R -Speed of sound -Total energy -Rothalpy -Mach number -Total velocity -Radius -Static pressure -Prandtl number -Free stream Reynolds number -tangential and radial components of velocity -Inlet, exit flow angle -Thermal conductivity -First and second coefficients of viscosity -Density -Shear stress -Circumferential angle -Rotational speed Subscripts a -Inviscid L -Laminar quantity N -Normal direction t -Stagnation quantity T -Turbulent quantity u -Viscous r,O 112 -Inletlexit quantity -First derivative with respect to P or 0 Superscripts -Relative frame quantitj 1 Downloaded by NANYANG TECHNOLOGICAL UNIVERSITY on June 14, 2016 | http://arc.aiaa.org |

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Centrifugal Fan Performance With Inlet Clearance

Cited by 13 publications

References 0 publications

Fluid Flow Analysis of a Single-Stage Centrifugal Fan with a Ported Diffuser

Fluid Flow Analysis of a Single-Stage Centrifugal Fan with a Ported Diffuser

Pressure Recovery in a Centrifugal Blower Casing

Numerical simulations of flows in centrifugal turbomachinery

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