A New Approach to The Design of Fan Volute Profiles

Qi, Datong; Pomfret, Mike; Lam, Ka Se

doi:10.1243/pime_proc_1996_210_198_02

Cited by 18 publications

(17 citation statements)

References 2 publications

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“…Although some detailed information has become available, yet more data on velocities, pressures and turbulence are required to comprehend its fluid mechanics fully. There is also a body of research on the optimization of the geometric parameters of such fans [2,7,9], but the interactions between different geometric configurations and flow mechanisms that they produce are yet to be fully understood.…”

Section: Introductionmentioning

confidence: 99%

Inlet induced flow in squirrel-cage fans

Montazerin

Damangir

Mirzaie

2000

Proceedings of the Institution of Mechanical Engineers, Part A:

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Energy conversion in squirrel-cage fans is sensitive to the inlet geometry. It occurs at the inlet where a separation zone which occupies a major volume in the rotor and the volute starts. In this research, different inlets of inward and outward types were tested on two fans. First, the inlet diameter and position were matched with the rotor, which improved the fan characteristic curves. The results of the experiments were sensitive to the width of the blade retaining ring (shroud). Later the tangential and radial components of the velocity out of the rotor were measured. The resulting velocity profiles across the scroll width showed that outward inlets produce a more uniform velocity angle inside the volute than inward inlets did. This was not because of a more aerodynamic flow through the rotor blades but was due to a better match between the inlet and the volute. The axial energy transfer resulted in tangential velocities larger than the rotor velocity, at axial positions across the volute where there was no flow out of the rotor.

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Section: Introductionmentioning

confidence: 99%

Inlet induced flow in squirrel-cage fans

Montazerin

Damangir

Mirzaie

2000

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…and 63 ∘ ; however, the taken values need to guarantee the flow-rate and the pressure performance parameters of the new structure are no less than the original one [9]. The three groups of volutes with tongue position angle are modeled and the rationality of the three degrees are discussed.…”

Section: Advances In Mechanical Engineeringmentioning

confidence: 99%

Prediction and Reduction of Aerodynamic Noise of the Multiblade Centrifugal Fan

Zhou

Wang

2014

Advances in Mechanical Engineering

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An aerodynamic and aeroacoustic investigation of the multiblade centrifugal fan is proposed in this paper, and a hybrid technique of combining flow field calculation and acoustic analysis is applied to solve the aeroacoustic problem of multiblade centrifugal fan. The unsteady flow field of the multiblade centrifugal fan is predicted by solving the incompressible Reynolds-averaged NavierStokes (RANS) equations with conventional computing techniques for fluid dynamics. The principal noise source induced is extracted from the calculation of the flow field by using acoustic principles, and the modeled sources on inner and outer surfaces of the volute are calculated with multiregional boundary element method (BEM). Through qualitative analysis, the sound pressure amplitude distribution of the multiblade centrifugal fan in near field is given and the sound pressure level (SPL) spectrum diagram of monitoring points in far field is obtained. Based on the analysis results, the volute tongue structure is adjusted and then a lownoise design for the centrifugal fan is proposed. The comparison of noise tests shows the noise reduction of improved fan model is more obvious, which is in good agreement with the prediction using the hybrid techniques.

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“…On the other hand, studies have focused on the design and improvement of the volute. Qi et al 9 improved the design method of the volute profile using a non-uniform distribution of flow parameters on the volute inlet circle and achieved a better fan performance. Samarbakhsh and Alinejad 10 designed a halfcone volute to adapt the impeller outflow velocity distribution along the axial direction and achieved a higher pressure and efficiency.…”

Section: Introductionmentioning

confidence: 99%

Effects of cut volute profile on squirrel cage fan performance and flow field

Jiang

Liu

et al. 2018

Advances in Mechanical Engineering

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The flow pattern in the volute of a squirrel cage fan is complicated and non-axisymmetric. In this article, the original volute profile of a squirrel cage fan was cut to control and reshape this non-axisymmetric flow structure. An experimental study was conducted to investigate the effects of the cut volute profile on the fan aerodynamic and acoustic performance. The results showed that cutting the volute profile with a relative cut position of 90°and a secondary clearance of 0.02D 2 could enhance the fan total pressure at the volume flow rate of 0.4Q BEP by about 7% without affecting the noise level. High-precision steady computational fluid dynamics simulation was also carried out to reveal the flow mechanism of the performance improvement. The results indicated that cut volute profile caused an impeller-across flow structure in the vicinity of the second clearance and re-organized the circumference distribution of the impeller flow status. Both the impeller working capability and the overall flow losses of the cut fan increased compared to the original one but the increment of the former was greater. This explains why fan pressure improved under low-flow conditions.

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A New Approach to The Design of Fan Volute Profiles

Cited by 18 publications

References 2 publications

Inlet induced flow in squirrel-cage fans

Inlet induced flow in squirrel-cage fans

Prediction and Reduction of Aerodynamic Noise of the Multiblade Centrifugal Fan

Effects of cut volute profile on squirrel cage fan performance and flow field

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