Effect of Gurney Flap Configuration on the Performance of a Centrifugal
                        Fan

Suresh, M.; Sitaram, N.

doi:10.29252/jafm.12.02.28609

Cited by 8 publications

(7 citation statements)

References 7 publications

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“…A low specific speed centrifugal fan test rig was used for the present experimental investigation. Detailed description of the test rig, instrumentation and experimental procedure were presented in Suresh and Sitaram (2019). However for the sake of completeness, these details are briefly presented below.…”

Section: Experimental Facility Instrumentation Procedures and Programmentioning

confidence: 99%

“…Energy coefficient increased with Gurney flap, dominantly at low Reynolds number and maximum flow rate slightly increased for the fan with a Gurney flap. Based on the encouraging results of Dundi et al (2012) further investigations were undertaken to optimize the height of Gurney flap by Suresh and Sitaram (2014) for application in centrifugal fans and found that there is an optimal Gurney flap height at which performance of the fan increases substantially. Kim et al (2013 and had recently applied a 5% chord height Gurney flap to the tip of a radial fan impeller for an air conditioner fan.…”

Section: Introductionmentioning

confidence: 99%

“…They showed that both head coefficient and efficiency were increased by 26.8% and 5.6% at the design flow coefficient of 0.138 when Gurney flap was used. Suresh and Sitaram (2019) had used Gurney flaps of different configurations, namely, angle/flat, half round and quarter round profiles and found that quarter round Gurney flaps gave slightly improved performance. Son et al (2017) patented a twisted type Gurney flap for application to the centrifugal fan for air conditioners.…”

Section: Introductionmentioning

confidence: 99%

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

Suresh

Sitaram

2022

JAFM

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The effect of Gurney flap height and mounting position on the head coefficient of a centrifugal fan at different Reynolds numbers is investigated experimentally. Quarter round Gurney flap of 1.0, 1.5, 2.0 and 2.5 mm height is mounted at three different positions, S=1.00 (impeller tip), S=0.95 and S=0.90 on the pressure surface of the impeller blade tip. Performance tests are carried out on the centrifugal fan at five Reynolds numbers corresponding to five rotational speeds of 1100, 1500, 2000, 2500 and 2900 rpm respectively. From the performance curves it is found that the fan head coefficient increases significantly with Gurney flaps at low Reynolds numbers and increases marginally at high Reynolds numbers. Effect of Reynolds number on the head coefficient is considerable for the baseline fan and found to be negligible for the fan with Gurney flaps, for all combinations of Gurney flap mounting position and height. The head coefficient of the fan improves as Gurney flap height increases but the improvement is marginal after certain height of Gurney flap. The head coefficient of the fan deteriorates when Gurney flap is mounted away from the impeller blade tip.

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Section: Experimental Facility Instrumentation Procedures and Programmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Suresh

Sitaram

2022

JAFM

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“…Dundi et al (2012) experimentally demonstrated that application of Gurney flap to the tip of a centrifugal impeller blade improves the performance at low Reynolds number. Suresh and Sitaram (2019) tested the same centrifugal fan with three types of Gurney flaps, angle, quarter round and half round types of different heights at different Reynolds numbers and found that quarter round Gurney flap gives slightly improved performance compared to the other two types. However, the investigations on Gurney flap for turbomachinery are very limited.…”

Section: Motivationmentioning

confidence: 99%

Computational and Experimental Investigations of Separation Control of LP Turbine Cascade Blades using Gurney Flaps

2021

JAFM

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The paper reports computational and experimental investigations carried out to control of laminar flow separation in LP turbine cascade blades at low Reynolds numbers. T106 LP turbine blade profile with a chord of 60 mm and blade spacing of 48 mm was used. The blade Zweifel loading factor was 1.03. Passive separation control device of Gurney flaps (GFs) of different shapes and sizes were used. Computations were carried out in Ansys-CFX. A two-equation eddy-viscosity turbulence model, shear stress transport (SST) was considered for all the computations along with gamma-theta (−) transition model. Computations were carried out for five different Reynolds numbers. Lift coefficient, total pressure loss coefficient, overall integrated loss coefficient and ratio of lift coefficient to overall integrated loss coefficient were used as a measure of aerodynamic performance for the cascade. From the computations, Flat and Quarter Round GFs of heights of 1.33% of chord were identified as the best configurations. Experiments in a seven bladed cascade were carried out for these configurations along with the basic configuration without GF at five Reynolds numbers. Experimental results agreed well with the computational results for these three cases at the five Reynolds numbers.

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“…Gurney flaps have been widely used and studied in airfoil static/dynamic stall control [2][3][4][5], flutter control [6], flapping airfoil control [7], ground effects [8], and rotor blade load control [9][10][11][12][13]. In these applications, the increases in the lift and the drag are closely related to airfoils, flow conditions, and the flap geometry.…”

Section: Introductionmentioning

confidence: 99%

Effect of Gurney Flap Geometry on a S809 Airfoil

Hao

Gao

2019

International Journal of Aerospace Engineering

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In this paper, the effect of Gurney flap shapes on wind turbine blade airfoil S809 has been studied by numerical simulation. First, the O-type grid is used in the numerical simulation. By comparing with experimental data, such as the lift force, the drag coefficient, and the pressure distribution, the accuracy of the simulation method is validated. Second, the research on the widths of three kinds of rectangular Gurney flaps at the trailing edge of the S809 airfoil is carried out. Rectangular Gurney flaps can considerably increase the lift in both the linear and nonlinear sections, and the maximum lift coefficient can be increased by 20.65%. In addition, the drag and the pitching moment are increased. However, the width of the rectangular Gurney flap has a small impact on the lift, the drag, and the pitching moment. Finally, the effects of rectangular and triangular Gurney flaps on the aerodynamic characteristics of the S809 airfoil are compared. The results show that the triangular flaps can obtain an increase of maximum lift coefficient by 28.42%, which is better than 16.31% of the rectangular flaps.

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Effect of Gurney Flap Configuration on the Performance of a Centrifugal Fan

Cited by 8 publications

References 7 publications

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

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

Computational and Experimental Investigations of Separation Control of LP Turbine Cascade Blades using Gurney Flaps

Effect of Gurney Flap Geometry on a S809 Airfoil

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