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Study and Performance Analysis of combustion chamber using ANSYS

Project MentorDr. Nilanjan Mallik Gyanendra Awasthi (13135043)

Jatin Kumar Chaudhari (13135048)

Group Members

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The primary design decisions are

The specification for engine type Peak power at a specified speed or RPM The number of cylinders Fuel and emission characteristics The total volume of the engine Overall packaging of the system including all the subsystems

Engine Design

These design decisions impact the computation of the amount of air and fuel needed by the engine and lead to a cascade of design decisions to maximize the overall efficiency of the engine.

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Combustion Chamber:

An enclosure in which combustion, especially of a fuel or propellant, is initiated and controlled. The mixture of fuel + air(oxygen) + residual gases combust inside the chamber when the Temperature increased to the ignition temperature of the fuel.

There are various kinds of combustion chamber having different benefits and limitations:

Hemispherical head combustion chamber Wedge head combustion chamber Disc head combustion chamber Pent-roof combustion chamber

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We have chosen Hemispherical Head combustion chamber for the analysis and canted valve design.

Why did we choose?

Hemispherical head gives an combustion chamber with minimal heat loss to the head.

It allows for large head of two valves.

good volumetric efficiency is also achieved due to improved fuel flow.

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But there are always some drawbacks. These are- Hemispherical valves will never have four valves per cylinder.

 Increased production cost and high relative weight (25% heavier than a comparable wedge head ).

Jaguar in-line 6-cylinder hemi heads

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Parameter ValueNumber of cylinders 1Bore X Stroke 88mm X 109mmSwept Volume 661ccClearance Volume 83ccCompression Ratio 8:1Minimum Valve Lift 0.20mmConnecting Rod length 238mmEngine Speed 1800rpm

Specification of the Engine

The designs of head, valves and piston are made by using CATIA V5 software.

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Parameter Valuea). Inlet Valve

Overall Length 110mmStem Diameter 7.98mmHead Diameter 48mm

b). Exhaust ValveOverall length 110mmStem Diameter 7.98mmHead Diameter 39mm

Valve Guide Seat O-Ring

Valve Dimensions-

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Hemispherical Head Design Valve Design

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Piston View and its Dimensions

All dimensions are in mm.

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Other Dimensions: -Head Diameter 87.50mmHead Thickness 7.50mmPiston Diameter 87.50mmPiston Thickness 4mmClearance 0.25mm

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Real Models of Valve and Piston

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Port Flow Analysis: Quantification of flow rate, swirl and tumble, with static engine geometry at different locations during the engine cycle.

Cold Flow Analysis: Engine cycle with moving geometry, air flow, and no fuel injection or reactions.

In-Cylinder Combustion Simulation: Power and exhaust strokes with fuel injection, ignition, reactions, and pollutant prediction on moving geometry.

Type of Analysis in IC Engine analysis system in Ansys 17.0-

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Cold Flow Simulation:

goal is to capture the mixture formation process by accurately accounting for the interaction of moving geometry with the fluid dynamics of the induction process.

Stages of IC Flow Simulation-

a). Simulation of the engine is started by importing the geometryb). Imported geometry is divided into small volumes and sub-volumes before meshing.c). Decompose the geometry into different zones and mesh them properly.d). Each volume will be meshed into hex or tet elements.

Non-conformal interface is used to completely shut the valve.

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IC Engine alaysis system in Ansys-

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Work done on Ansys till now-

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Main objectives-

The primary goal of engine design is to maximize each efficiency factor, in order to extract the most power from the least amount of fuel. In terms of fluid dynamics, the volumetric and combustion efficiency are dependent on the fluid dynamics in the engine manifolds and cylinders. Efficiency factors are indicated efficiency, brake efficiency, mechanical efficiency, volumetric efficiency, combustion efficiency.

The second goal of engine design is to meet emissions requirements, which are always specified by regulations. The pollutants include oxides of nitrogen, sulfur oxides (SOx), CO (carbon monoxide), unburned hydrocarbons (HC), and Poly Aromatic Hydrocarbons (PAH or “soot”), which are all products of the combustion process.

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References-

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

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Thank You