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International Journal of Scientific and Engineering Research
ISSN Online 2229-5518
ISSN Print: 2229-5518 12    
Website: http://www.ijser.org
scirp IJSER >> Volume 2, Issue 12, December 2011
Design Modification in Engine Exhaust
Full Text(PDF, 3000)  PP.  
Author(s)
Ram M S
KEYWORDS
Internal Combustion Engine, Exhaust Valve, Dirichlet’s Boundary Condition, Conduction Heat Transfer, Convection Heat Transfer, Turbo Chargers, Al-Mg-Si and Chrome Steel, Valve Actuation
ABSTRACT
The system aims at modifying the position and diameter of the exhaust valve in order to reduce the probability of knocking (both in SI and in CI) and lessen the dilution of charge because of the small size of exhaust valve when compared to the size of inlet valve. The size of the exhaust valve is smaller when compared to the size of inlet valve. It is done so because the region closer to the exhaust valve is at a higher temperature compared to that of the temperature surrounding the inlet valve. Now if the exhaust valve size is increased there will be higher possibility of knocking because the charge coming inside the combustion chamber has a higher probability of combusting at exhaust valve's surface (due to large surface area). On the other hand if the size is too small then, there will be greater possibility of dilution in the intake charge because there is no enough space for the burnt gas to leave the chamber.
References
[1] John B Heywood, “Internal Combustion Engines Fundamentals”, McGraw Hill Book Company.

[2] Gary L.Borman & Kenneth W. Ragland, “Combustion Engineering”, McGraw Hill International Editions- Mechanical Series.

[3] Frank P Incropera, “Fundamentals of Heat and Mass Transfer”, Wiley India Edition.

[4] Ramalingam K K, “Internal Combustion Engines”, Scitech.

[5] Rajput R K, ”Thermal Engineering”, Laxmi Publications

[6] Other sources on web

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