Effect of Gurney flap Height and Mounting Position on the Performance of a Centrifugal Fan

In this paper, the effect of the outlet surface area of the spiral casing on the performance of a centrifugal fan was investigated using open source CFD software OpenFOAM [1]. An automized loop with RANS and data post-processing is set up using Matlab, for allowing a large number of parameter variations. The effect was analyzed as a function of total pressure loss and static pressure recovery coefficient and on total efficiency as well.

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Gurney flap scaling for optimum lift-to-drag ratio

AIAA Journal ◽

10.2514/3.13766 ◽

1997 ◽

Vol 35 ◽

pp. 1888-1890 ◽

Cited By ~ 7

Author(s):

Philippe Giguere ◽

Guy Dumas ◽

Jean Lemay

Keyword(s):

Gurney Flap ◽

Drag Ratio ◽

Lift To Drag Ratio

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Case study: Evaluation of discrete frequency noise generated from object in wake of centrifugal impeller: Case study on tonal noise of a centrifugal fan Centrifugal Fan

Noise Control Engineering Journal ◽

10.3397/1/376727 ◽

2019 ◽

Vol 67 (4) ◽

pp. 307-314

Author(s):

Soichi Sasaki

Keyword(s):

Centrifugal Impeller ◽

Frequency Noise ◽

Centrifugal Fan ◽

Tonal Noise ◽

Discrete Frequency ◽

Study Evaluation

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Noise control of a backward-curved centrifugal fan by reducing pressure fluctuations between the impeller and cut-off surface

Applied Acoustics ◽

10.1016/j.apacoust.2021.107996 ◽

2021 ◽

Vol 178 ◽

pp. 107996

Author(s):

Ali Hosseinian ◽

Hamid Kolahdoozan ◽

Amir Homayoon Meghdadi Isfahani

Keyword(s):

Noise Control ◽

Pressure Fluctuations ◽

Centrifugal Fan

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Numerical investigations on the effect of volute casing treatment for performance augmentation in a centrifugal fan

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1177/09544062211034190 ◽

2021 ◽

pp. 095440622110341

Author(s):

Manjunath L Nilugal ◽

K Vasudeva Karanth ◽

Madhwesh N

Keyword(s):

Total Pressure ◽

Static Pressure ◽

Numerical Study ◽

Pressure Coefficient ◽

Three Dimensional ◽

Pressure Rise ◽

Centrifugal Fan ◽

Casing Treatment ◽

Sliding Mesh ◽

Optimum Configuration

This article presents the effect of volute chamfering on the performance of a forward swept centrifugal fan. The numerical analysis is performed to obtain the performance parameters such as static pressure rise coefficient and total pressure coefficient for various flow coefficients. The chamfer ratio for the volute is optimized parametrically by providing a chamfer on either side of the volute. The influence of the chamfer ratio on the three dimensional flow domain was investigated numerically. The simulation is carried out using Re-Normalisation Group (RNG) k-[Formula: see text] turbulence model. The transient simulation of the fan system is done using standard sliding mesh method available in Fluent. It is found from the analysis that, configuration with chamfer ratio of 4.4 is found be the optimum configuration in terms of better performance characteristics. On an average, this optimum configuration provides improvement of about 6.3% in static pressure rise coefficient when compared to the base model. This optimized chamfer configuration also gives a higher total pressure coefficient of about 3% validating the augmentation in static pressure rise coefficient with respect to the base model. Hence, this numerical study establishes the effectiveness of optimally providing volute chamfer on the overall performance improvement of forward bladed centrifugal fan.

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Computational Investigation of the Effects of Gurney Flap on the Forward Flight Characteristics of Helicopter Rotors

26th AIAA Applied Aerodynamics Conference ◽

10.2514/6.2008-6726 ◽

2008 ◽

Cited By ~ 1

Author(s):

Lakshmi Sankar ◽

Byung-Young Min ◽

Nischint Rajmohan ◽

JVR Prasad

Keyword(s):

Computational Investigation ◽

Forward Flight ◽

Helicopter Rotors ◽

Gurney Flap

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Laser-Doppler Velocimetry Measurements Inside a Backward Curved Centrifugal Fan

International Journal of Rotating Machinery ◽

10.1155/s1023621x01000161 ◽

2001 ◽

Vol 7 (3) ◽

pp. 173-181

Author(s):

Tong-Miin Liou ◽

Meng-Yu Chen

Keyword(s):

Flow Rate ◽

Turbulence Intensity ◽

Laser Doppler Velocimetry ◽

Reverse Flow ◽

Flow Region ◽

Design Flow ◽

Laser Doppler ◽

Centrifugal Fan ◽

Doppler Velocimetry ◽

Flow Rates

Laser-Doppler velocimetry (LDV) measurements are presented of relative mean velocity and turbulence intensity components inside the impeller passage of a centrifugal fan with twelve backward curved blades at design, under-design, and over-design flow rates. Additional LDV measurements were also performed at the volute outlet to examine the uniformity of the outlet flow for the three selected flow rates. Complementary flow visualization results in the tongue region are further presented. It is found that the number of characteristic flow regions and the average turbulence level increase with decreasing air flow rate. For the case of under-design flow rate, there are a through-flow region on the suction side, a reverse flow region on the pressure side, and a shear layer region in between. The corresponding average turbulence intensity is as high as 9.1% of blade tip velocity.

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Structural Analysis of Centrifugal Fan Impeller Using CATIA Software

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.809-810.859 ◽

2015 ◽

Vol 809-810 ◽

pp. 859-864

Author(s):

Dănuţ Zahariea

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Structural Analysis ◽

Design Methods ◽

Constant Thickness ◽

Blade Design ◽

Centrifugal Fan ◽

Element Analysis ◽

The Finite Element Analysis ◽

Modes Of Vibration

In this paper, the finite element analysis for stress/deformation/modes of vibration for the centrifugal fan impeller with constant thickness backward-curved blades using CATIA software will be presented. The principal steps of the finite element analysis procedure using CATIA/Generative Structural Analysis environment will be presented: creating the 3D model; configuring the mesh; applying the restraints; applying the loads; running the numerical static analysis and the numerical frequency analysis; interpreting the results and observing the modes of vibration correlating with the impeller mode shape. This procedure will be used for 4 different centrifugal fan impellers according with the 4 blade design methods and the results will be comparatively analyzed. For each design method, two materials will be used: steel with density of 7860 kg/m3 and aluminium with density of 2710 kg/m3. Two important results have been obtained after the structural analysis: under the working conditions considered for the analysis, all 4 blade design methods leads to impellers with very good mechanical behaviour; any frequency of the main modes of vibrations for all blade design methods and for both materials is not in phase with the impeller speed, thus the possibility of resonance being eliminated.

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