Study on High Specific Speed Airfoil Fans : 1st Report, Effects of Tongue Clearance and Mouth Ring Clearance

昭次, 鈴木; 義雄, 鵜飼

doi:10.1299/kikai1938.42.2763

Cited by 2 publications

(2 citation statements)

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“…Volute, impeller and inlet are basic elements that have vital importance in centrifugal fans. For impeller and volute some case studies (consideration and modifications) have been done to find out and modify the interaction between impeller and volute and flow pattern at the exit of impeller and also near tongue [4,5,3,6]. Axial gap between inlet diffuser and impeller is one of the basic parameters of inlet that can have a great role among the other inlet parameters.…”

Section: Introductionmentioning

confidence: 99%

Effect of Axial Gap between Diffuser Inlet and Impeller on Efficiency and Flow Pattern of Centrifugal Fans

Gholamian

Rao

Bhramara

2013

AMM

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Inlet is one of the basic elements of squirrel cage fan that can have great effect on performance and losses, especially between inlet exit and first section of impeller width. In this paper the effect of axial gap between inlet diffuser and impeller on performance and flow pattern is considered. Three diffuser inlet sizes with respect to impeller size (smaller, nearly same and bigger than inner impeller diameter) and three axial gaps within the available dimensions of the casing and impeller were chosen. Numerical simulations were performed to find the effect of this axial gap on flow pattern, performance and efficiency. From the simulation of each case study, flow pattern and its mechanism and the causes that affecting the efficiency and performance due to axial gap are analyzed and presented.

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Section: Introductionmentioning

confidence: 99%

Effect of Axial Gap between Diffuser Inlet and Impeller on Efficiency and Flow Pattern of Centrifugal Fans

Gholamian

Rao

Bhramara

2013

AMM

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“…These are the inlet direction, inward (nozzle shape) or outward(diffuser shape), inlet diameter and axial gap between inlet and impeller. Suzuki and Ugai [2] for back ward airfoil blades with different inlet nozzle showed that the fan with the lowest radial gap has the best efficiency.…”

Section: Introductionmentioning

confidence: 99%

Flow Pattern and Efficiency Changes of Squirrel Cage Fans due to Inlet Diffuser Diameter Changes - Using CFD Method and Experimental Validation

Gholamian

Rao

Bhramara

2013

AMM

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Inlet is one the basic elements of squirrel cage fans that has a significant effect on fan performance and efficiency. Recently using the CFD calculation methods with sufficient related tools for finding the flow pattern and related parameters, applying modifications and representing proper solutions, has being increased. In the present case study to study the effect of inlet diffuser diameter on the fan efficiency and flow pattern, using numerical simulations and experimental validations, three different inlet diffuser diameters are used as inlet instead of inlet nozzle. To simulate these cases some geometries with special additional element, proper mesh pattern and size and proper turbulence model was chosen.It is observed performance and efficiency curves of fans with respect to use of inlet nozzle are more flattened with higher magnitude. So fan operation around the best performance point is more stable without significant fluctuation of head pressure and efficiency.

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Study on High Specific Speed Airfoil Fans : 1st Report, Effects of Tongue Clearance and Mouth Ring Clearance

Cited by 2 publications

References 0 publications

Effect of Axial Gap between Diffuser Inlet and Impeller on Efficiency and Flow Pattern of Centrifugal Fans

Effect of Axial Gap between Diffuser Inlet and Impeller on Efficiency and Flow Pattern of Centrifugal Fans

Flow Pattern and Efficiency Changes of Squirrel Cage Fans due to Inlet Diffuser Diameter Changes - Using CFD Method and Experimental Validation

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