PARAMETRIC STUDY OF CENTRIFUGAL FAN PERFORMANCE: EXPERIMENTS AND NUMERICAL SIMULATION

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International Journal of Advances in Engineering & Technology
Pages: 
33-50
Volume: 
1
Issue: 
2
Date: 
Sunday, May 1, 2011

In this paper, effect of geometric parameters of a centrifugal fan with backward- and forward-curved blades has
been investigated. Centrifugal fans are used for enhancing the heat dissipation from the IC engine surfaces. In the
process, the fan consumes power generated from the engine. As a first step, an experimental setup was developed
and prototypes of fans were made to carry out measurements of flow and power consumed by the fan. The fan
mounting setup was such that fan with uniform blades can be tested. Generally, fans have cut blades on the vehicle
due to mounting accessories. We describe a patented design of shaft that would enable mounting of fan with uniform
blades on the vehicle. Next, a computational fluid dynamics (CFD) model was developed for the above setup and the
results are validated with the experimental measurement. Further, parametric studies were carried out to quantify
the power coefficient, flow coefficient, efficiency and flow coefficients. The parameters considered in this study are
number of blades, outlet angle and diameter ratio. The results suggest that fan with different blades would show
same performance under high-pressure coefficient. However, the difference between the performances becomes
distinct under low pressure coefficients suggesting that the fan performance testing should not be done on vehicle
level where high pressure coefficients is observed due to various resistances in the system. The results show that
increase in flow coefficient is accompanied by decrease in efficiency and increase in power coefficient. Effect on the
vehicles mileage due to the use of forward and backward fan is also discussed. In summary, this study presents a
systematic and reliable strategy to investigate the centrifugal fan performance in automotive applications.

Rights: 
IJAET
Author Name: 
Om Prakash Singh
T. Sreenivasulu
Rakesh Khilwani
M. Kannan
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