Volume No. 7 Issue No.: 1A Page No.: 512-522 July-September 2012

 

INTAKE VALVE DESIGN FOR HIGH LEVEL SWIRL INDUCTION IN CARBURETED SPARK IGNITION ENGINE

 

Pandey K. M.* and Roy Bidesh

Department of Mechanical Engineering, N.I.T Silchar, Assam (INDIA)

 

Received on : May 05,2012

 

ABSTRACT

 

The air standard efficiency for SI engine is approximately 60% under full load condition but the actual brake thermal efficiency under full load condition is approximately 32.6% which is due to the various losses that occur. One of the primary loss is burning time loss which is approximately 4% and occurs due to finite time combustion of the charge. This lose can be reduced to some extent by generation of a higher degree of swirl which will increase turbulence intensity with in the engine cylinder. Keeping the above points in view, in this paper, an analysis is performed in a carbureted SI engine using Computational Fluid Dynamic (CFD) code FLUENT to determine the level of swirl induced. The computation is performed again on the same engine for another three different types of intake valve. Finally on the basic for the data achieved from the four computation, a new type of intake valve has been designed and the CFD analysis is also carried out for it at different crank angle during the suction stroke of the engine and at corresponding valve lift and intake pressure and thus, a detail investigation of the newly design intake valve in terms of the level of swirl is carried out.

 

Keywords : Swirl, Turbulence intensity, Swirl ratio, Computational Fluid Dynamic (CFD), SI engine

 

 

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