Analysis of Air Flow Through Intake Manifold Wagon

Journal of Mechanical Engineering Research and Technology
Volume 2, Number 1, (2014) pp 455-460
© Delton Books
www.deltonbooks.com
Analysis of Air Flow Through Intake Manifold Wagon-R
Using PRO-E & CFX
Mr.S.Rajamanickam
Abstract:
The performance of the car is very dependent on the design of the intake system,
with air distribution and tuning critical factors. An intake system incapable of
producing volumetric efficiencies greater than unity and a density around
atmospheric will result in the vehicle never utilizing all the potential mass flow of
air. In this work I have modeled the intake manifold of WAGON-R in the modeling
software PRO-E and imported my the intake manifold model to analyzing software
FLUENTCFD .I have meshed the intake manifold into finite element by GAMBIT
and then using FLUENT I have found air flow inside the intake manifold during
various conditions i.e., idling, part throttle and full throttle condition. It provides
complete information on flow velocity and pressure at every point inside the
manifold, making it easy to detect problems and correct them. This is an area that
deserves much attention and time in order to produce a competitive naturally
aspirated vehicle.
Introduction:
The engine is undeniably one of the most important parts of every vehicle. Without it, your
car cannot move. But engines alone cannot perform its task efficiently. That is why engines
are equipped with a number of systems that help it do its job of converting fuel into motion.
An intake manifold of inlet manifold is one part of an engine and that with MPFI plays a very
crucial role. A car’s engine requires the right mixture of air and fuel to work efficiently. If
this is attained, your engine would run verywell.
·
Intake Manifold:
The network of passages that direct air or air-fuel mixture from the throttle body to the intake
ports in the cylinder head. The flow typically proceeds from the throttle body into a chamber
called the plenum, which in turn feeds individual tubes, called runners, leading to each intake
port. Engine breathing is enhanced if the intake manifold is configured to optimize the
pressure pulses in the intake system.
Tangential Intake Manifold
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Mr.S.Rajamanickam
Helical Intake Manifold
Fig 1.1 Intake Manifold
Modeling:
The modeling of intake manifold of WAGON-R was done using PRO-E software using
measured dimensions.
·
Model of Intake Manifold in Wagon-R:
Fig 2.1Model of Intake Manifold of Wagon-R
Analysis of the Air Flow in the Intake Manifold:
The intake manifold of Wagon-R modeled is imported to gambit environment by converting
it into iges file. To analyze the air flow in the manifold, two steps are involved meshing and
applying the boundary condition for iteration. The meshing and flow analysis is done in
GAMBIT and FLUENT.
Theoretical Verification:
Continuity Equation and General Gas Equation:
Continuity equations for air intake manifold of wagon-R are derived. Equated the profile
before modification and after modification for knowing thevelocity changes. The general
gas equation is used to relate the pressure and velocity.
Analysisof air flow through intake manifold Wagon-R using PRO-E & CFX
457
Fig 4.1 Before and after changing air intake profile
From the governing equation
r1 A1 v 1= r2 A2 V2
The area of the out let is decreased after changing the profile so from the above equation we
know that velocity is increased. Thus we obtain our objective.
Meshed Model Intake Manifold of Wagon-R:
Fig 5.1 Meshed Model Intake Manifold Of Wagon-R
Analyzed result from ANSYS CFD:
·
Idling Range –Pressure and Velocity inside Intake Manifold:
EXISTING MODEL
AFTER CHANGING THE PROFILE
AFTER CHANGING THE PROFILE
AND ANGLE
Fig 6.1 Idling Range
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·
Mr.S.Rajamanickam
Cruising Range-Pressure and Velocity inside Intake Manifold:
EXISTING MODEL
AFTER CHANGING THE PROFILE
AFTER CHANGING THE PROFILE
AND ANGLE
Fig 6.2Crusing Range
·
Power Range-Pressure and Velocity Inside Intake Manifold:
EXISTING MODEL
AFTER CHANGING THE PROFILE AFTER CHANGING THE PROFILE
AND ANGLE
Fig 6.3Power Range
·
The Charts for Velocity:
The output velocity of the three different models is shown in the charts.
Analysisof air flow through intake manifold Wagon-R using PRO-E & CFX
459
Fig 6.4Velocity Chart
From this charts we observes that the maximum velocity is obtain after changing the
profile.(i.e. Reducing the outlet area)
·
The Charts for Pressure:
Output pressure of the three different models is shown in the charts
AFTER CHANGING THE PROFILE
60000
p re s s u r e (p a s c a l)
p re s s u r e (p a s c a l)
EXISTING
90000
80000
70000
60000
50000
40000
30000
20000
10000
0
50000
40000
30000
20000
10000
0
1
2
3
ideal
4
5
6
7
partial
8
9
10 11
full
12
1
2
3
ideal
4
5
6
7
partial
8
9
10
11
12
full
Fig 6.5Pressure Chart
From this charts we observes that the minimum pressure is obtain after changing the profile.(i.e.
Reducing the outlet area)
Conclusion:
Computer simulation helped to adapt an intake manifold design to meet the varying requirements of
several different vehicle models, Instead, computational fluid dynamics (CFD) simulated airflow
through a series of proposed designs while providing complete information on flow velocity and
pressure at every point inside the manifold, making it easy to detect problems and Correct them. By
getting all the major players involved in the design process to review the CFD results as soon as
they were available, it was possible to conceive, detail, and analyze each successive design change
in only one day, a tenfold improvement over the traditional approach. It also plays important role to
meet noise/vibration/harshness (NVH) requirements.
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Mr.S.Rajamanickam
Comparing the pressure and velocity charts and results obtained from existing model,
modified profile, modified profile and angle. We conclude that the results obtained with
modified profile are efficient in all idling, cruising and power ranges. Thus we achieve low
pressure and high velocity into combustion chamber.
Reference:
Singh K, “Automobile Engineering”,Standard Publishers, Delhi.
NarangGBS, “Automobile engineering”,Khanna Publisher..
RAJESH-SUNDARAM.COM
AUTOMOTIVEWORLD.COM
CYBERSTEERING.COM

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