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Design and analysis of

Centrifugal blower

By Using CFD

Project members and Project guide

www.themegallery.com

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)

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.


Contents

1

2

3

Literature review4

Introduction

Project Background

Details of the project upto now

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

Definition & Principle of working


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

Centrifugal blower :- Types

Centrifugal

blower types

Forward

curved

blower

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.


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

ApplicationsConveying 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

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)



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.

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,.

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.

Applications

Power Generation

Automotive

Biomedical

Applications of CFD

Aerospace

Hydraulics

Marine


3.Data collected for the project

Input

ParametersMDKValue

Inlet diameter 250mm

Outlet diameter 500mm

Shaft diameter 200mm

Motor RPM 1440

Speed of fan rotation 2070

Power7.5HP(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

Parameters of impeller blades

Volute Casing Details

Modeling of blower in gambit

1.Backward curved blower

Forward curved blower

Radial blower

Analysis of blower

Backward curved blower

Forward curved blower

Radial blower

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.

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.

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