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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

International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v40.i6.10
pages 469-481

Accretion of the Efficiency of a Forward-Curved Centrifugal Fan by Modification of the Rotor Geometry: Computational and Experimental Study

Javad Alinejad
Center of Excellence on Modeling and Control Systems (CEMCS) and Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad 91775-1111, Iran
Nader Montazerin
Department of Mechanical Engineering, Amirkabir University of Technology Tehran, Iran
Sina Samarbakhsh
Department of Mechanical Engineering, Amirkabir University of Technology Tehran, Iran

ABSTRACT

The present publication shows complex characteristics of the flow both in cylindrical and conical frustum-shaped rotor. The comparison of the results presented a great dependence of the rotor shape and the fan efficiency. The targeted topic in this particular study is the design optimization of a centrifugal fan in central heating and air-conditioning systems and in numerous other applications. In order to improve efficiency of a centrifugal fan and uniform flow field in outlet, the current study optimizes the shape of rotor using two different geometries: cylindrical and conical frustum-shaped. Numerical simulation was performed by a 3D turbulence, incompressible flow analysis. Reynolds-averaged Navier − Stokes equations with the standard k−ε turbulence model have been discretized by the finite volume method. The overall experiments were conducted in a standard ISO 5801:1997 test chamber apparatus. To obtain the occurring flow patterns inside the test section from the experimental data, the optical measurement technique laser Doppler anemometry (LDA) is applied in the analysis and they were used to validate the CFD simulations. It was found that, a conical frustum-shaped rotor with the optimal cone angle can cause a higher efficiency and performance than a cylindrical design under similar conditions such as, equal head coefficient.


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