This document summarizes a student project analyzing the performance of a centrifugal blower using computational fluid dynamics (CFD). The project team used CFD software to model and analyze blowers with different impeller blade designs, including backward curved, forward curved, and radial blades. They collected input parameters for the blower and blade designs. The team reviewed previous literature on blower blade design and performance. They modeled the different blower designs in Gambit and analyzed the results in Fluent to compare blower performance.

1. LOGO
Design and analysis of
Centrifugal blower
By Using CFD

2. Project members and Project guide
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Project Team:
Project Guide:
Md.Hasheer (Asst. Professor)
Project Leader:
Shaik Mustaq Elahi (L12ME 1010)
Team Members:
Siva Subrahmanyam (L12ME1017)
Priyanka (Y11ME937)
Shaik Akram (Y11ME946)
Mounika (Y11ME952)

3. ABSTRACT
Impeller blades are one of important element of a
centrifugal fan . They are mostly categorized into
six types: AF, BI, BC, FC, RT, RB among which the
BI i.e. impeller with back blades are considered as
highly effective. The succeeding paper presents the
performance enhancement a centrifugal blower with
impellers having various types of blades.
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4. Contents
1
2
3
Literature review4
Introduction
Project Background
Details of the project upto now

5. 1.Introduction
 Compressors , blowers and fans are all the members of
the same family of machines called turbo machines.
 A turbo machine is power or head generating machine
which employs the dynamic action of a rotating
element (i.e. the rotor) the action of the rotor changes
the energy level of the continuously flowing fluid
through the turbo machine.
Centrifugal blower :-
 A centrifugal blower is a mechanical device which is
used for circulating air or other gases at a pressure of
1.5 to 2.75 bars

6. Definition & Principle of working
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A blower is a rotary, positive displacement type of
machine used to move gas and air and is used in a
variety of methods. Rotary blowers and positive
displacement blowers are just two of several types
that are available

7. Centrifugal blower :- Types
Centrifugal
blower types
Forward
curved
blower

8. 1
Forward-curved
blowers operate at
low temperatures
and well suited for
low tip speed and
high air flow
2
Backward-curved
blowers are more
efficient than
forward-curved
fans.
3
Radial blowers
are industrial
work-horses well
suited for high
temperature and
medium blade tip
speeds.

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Difference between various turbo machines
Blower PumpFan Comp.
A blower is
a machine
for moving
volumes of
a gas
with a
pressure of
about 1.7
bar
A fan moves
large
quantity of
gas with
low
increase in
pressure
upto 1.15
bar
A pump is
a machine
for raising
a liquid to
a higher
level of
pressure
upto 1.01
bar
A comp. is
a machine
for raising
a gas to a
higher
level of
pressure
above 1.7
bar

10. Applications
Conveying material in
dust collector systems
Applications of Blower
Food processing
Circulating air in ovens
and dryers
General ventilation of
rooms or factories.
Cooling electrical equipment
Combustion air for burners

11. 2.Project background
Computational fluid dynamics :-
Computational fluid dynamics, usually abbreviated
as CFD, is a branch of fluid mechanics that uses
numerical methods and algorithms to solve and
analyze problems that involve fluid flows.
Cfd software involves two tools
1. Gambit ( pre- processor)
2. fluent ( solver & post processor)
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CFD(Computational Fluid Dynamics)
CFD is one of the branches of fluid mechanics that uses
numerical methods and algorithms to solve and analyze problems
that involve fluid flows.
Computer are used to perform the millions of calculations
required to simulate the interaction of fluid and gases with the
complex surfaces used in engineering.
However, even with simplified equations and by using high speed
super computers, only approximate solutions can be achieved in
many cases.
More accurate codes that can accurately and quickly simulate
even complex scenarios such as supersonic or turbulent flows are
an on going area of research.

13. CFD process Consists of Three Primary
Steps
Pre-Processing Solver Post-Processing
This is the first
step of CFD
simulation
process which
helps in
describing the
geometry in the
best possible
manner.
fluid & material
properties, flow
physics model,
and boundary
conditions are
applied with the
help of solver by
using a
computer.
The final step is
to analyze the
results with
different methods
like contour plots,
vector plot,
streamlines, data
curve etc,.

14. Advantages of cfd
1. It provides the flexibility to change design parameters
without the expense of hardware changes.
2. It has a faster turnaround time than experiments.
3. It guides the engineer to the root of problems, and is
therefore well suited for trouble-shooting.
4. It provides comprehensive information about a flow
field, especially in regions where measurements are
either difficult or impossible to obtain.

15. Applications
Power Generation
Automotive
Biomedical
Applications of CFD
Aerospace
Hydraulics
Marine

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3.Data collected for the project
Input
ParametersMDK
Value
Inlet diameter 250mm
Outlet diameter 500mm
Shaft diameter 200mm
Motor RPM 1440
Speed of fan rotation 2070
Power
7.5HP(AC 3
phase)
V.S. Thangarasu, G. Sureshkannan, N.V. Dhandapani., Design and
Experimental Investigation of Forward Curved,
Backward Curved and Radial Blade Impellers of Centrifugal Blower.
Aust. J. Basic & Appl. Sci., 9(1): 71-75, 2015

17. Parameters of impeller blades
Volute Casing Details

18. Modeling of blower in gambit
1.Backward curved blower

19. Forward curved blower

20. Radial blower

21. Analysis of blower
Backward curved blower

22. Forward curved blower

23. Radial blower

24. 4.Literature and Review
XinweiShu et al (2009) showed how the
performance can be improved by
properly reshaping its blade a developed
multipoint optimisation approach.
They conducted test on the forward blade.
Singh O. P. et al (2011) investigated
the effect of geometric parameters of
centrifugal blower with forward
and backward curved blades.

25. Sun-Sheng Yang et al conducted
performance on centrifugal blower
theoretically, numerically and
experimentally.
Choon-Man Jang et al (2013) analysed
the effect of design variables on the
performance of centrifugal blowers.
They found that the casing height of
the design variable is more sensitive
on the function of efficiency compared
to that of casing width.

26. LOGO