This document summarizes a study of combustion chamber simulation using ANSYS. It discusses: 1) The team designed the combustion chamber geometry in CATIA and imported it into ANSYS for analysis. 2) They performed simulations of swirl and tumble flow in the chamber to analyze air flow and turbulence. 3) The results showed increasing velocity and turbulence with higher valve lift up to a point, beyond which more turbulence is undesirable.

1. STUDY AND PERFORMANCE ANALYSIS OF
COMBUSTION CHAMBER USING ANSYS (II)
Project mentor
Dr. Nilanjan Mallik
1Group Members
Gyanendra Awasthi (13135043)
Jatin k. Chaudhari (13135048)

2. Engine design :-
The primary design decisions are:
1. The specification of engine type
2. Peak power at a specified speed or rpm
3. The number of cylinders
4. Fuel and emission characteristics
5. The total volume of the engine
6. Overall packaging of the system including all the
subsystems
2

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 The geometry of the ports-valves and cylinders is "frozen" at
critical points during the engine cycle
 The air flow through the ports is analysed using CFD
 Flow rate through the engine volume, swirl and tumble in the
cylinder are determined.
 Turbulence level are also determined.
The results-
 provide snapshots of the fluid dynamics throughout the
engine cycle.
 are used to modify the port geometry to produce desired
behaviour of the air flow
Port flow simulation:-

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SWIRL FLOW AND TUMBLE FLOW:-
1- SWIRL FLOW:-
The axis is more or less coincident with axis of the cylinder.
It is commonly used in diesel engines.
Fig. Swirl flow
in diesel engine
Two types of flows that occurs inside the combustion chamber in
case of port simulation. These are:

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2- TUMBLE FLOW:-
The axis of rotation of flow is perpendicular to the axis of cylinder.
We refer the rotational axis associated with it, is the Z axis, in this
case the point out of the screen, towards the reader.
Figure: Tumble flow in
combustion chamber

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WHAT WE DID?
We measured the dimensions of combustion chamber of an
IC Engine.

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Valve Dimensions:-

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 We made the design of the head of combustion chamber in the
CATIA V5.
 After that we imported this design into the ANSYS17.0 workbench.
Fig. Design of
combustion head
made in CATIA V5

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Performed all the analysis in IC-Engine(Fluent) component of
ANSYS17.0 workbench.
We then set the required parameters like distance of post planes
in input manager in design modular.
After that we decompose the combustion chamber after giving
the required geometry.
Then we MESH the whole geometry. Since the turbulent flow
interactions with the walls are critical, mesh refinement in the
near wall region is necessary.
Steps performed in Ansys17.0 -

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Snapshot of input
manager in
ANSYS17.0
workbench design
modular:-

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Meshed geometry-

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.
Then we setup the parameters to start the simulation.

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Setup parameters:

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Material-
Input fluid Air
Material of chamber selected in
simulation-
Aluminum

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Results::-

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Results:
Figure: The plot b/w velocity magnitude
and crank angle at 0.1 mm valve lift.
Figure: The plot b/w the velocity
magnitude and the crank angles at
0.2mm of valve lift.

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Burning time losses:-
 If the spark is initiated at TDC, the
pressure would be low due to
expansion of gases.
 If the spark is initiated too early then
additional work is required to compress
the burning gas, which is a direct loss.

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Future aspects:-
 As we did our port flow simulation of combustion chamber to
determine the turbulence by changing the minimum valve lift
 We can optimize the design parameters, keeping the optimum
derived minimum valve lift by using the cold flow simulation.
 We can also derive the fuel spray design and the reduction in the
exhaust emissions.

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Conclusions:-
 Initially as we are increasing the valve lift, the velocity magnitude is
also increasing, means the turbulence is increasing.
 But after certain extent that too much turbulence is not desirable,
because it will blow off the flame.
 We got the plot b/w mass flow rate at various swirl planes with
respect to no. of iterations.
After performing our simulation we came to the conclusion:

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ANSYS 14.0 Library
S. Parimala Murugaveni, P. Mohamed Shameer ; “ANALYSIS OF
FORCED DRAFT COOLING TOWER PERFORMANCE USING ANSYS
FLUENT SOFTWARE” ; International Journal of Research in
Engineering and Technology e-ISSN: 2319-1163 | p-ISSN: 2321-7308
Rohith. S, Dr. G .V. Naveen Prakash; “Cold Flow simulation in IC
Engine” ; International Research Journal of Engineering and Technology
(IRJET); e-ISSN: 2395 -0056 p-ISSN: 2395-0072
References :-

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Thank You !