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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Print: 2152-5102
ISSN Online: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v41.i2.20
pages 106-119

Effect of Inlet Diffuser Diameter on Flow Pattern and Efficiency of Squirrel Cage Fans with CFD Method

Mojtaba Gholamian
Department of Mechanical Engineering JNTUH, College of Engineering Hyderabad, India
Gurram Krishna Mohan Rao
Department of Mechanical Engineering JNTUH, College of Engineering Hyderabad, India
Panitapu Bhramara
Department of Mechanical Engineering JNTUH, College of Engineering Hyderabad, India
Specialized in Refrigeration and Air conditioning, Heat Transfer and Two Phase Flows
Dadollah Hajalian
Pardis Petrochemical Co., Pars Special Economic/Energy Zone Bushehr, Iran


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 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 that diameter has a great influence on fan performance and efficiency, more than 14 % for 2 cm difference in diameter. Here 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. Also, the patterns of static pressure, axial velocity, radial velocity and tangential velocity are captured to analyze the effect of inlet mechanism on flow pattern and efficiency.