Experimental Investigation on Performance and Emission of IC-Engine by Modifying Inlet Manifold

Abstract

Turbulence means a random motion in 3D with varying size superimposed on one another and randomly
distributed within the flow. An experimental investigation is carried out by modifying inlet manifold to understand the
effects on performance and exhaust emission. For this research work, 4-stroke, air cooled, single cylinder, direct
injection, natural aspirated diesel engine was used. Geometrical design of intake manifold is very important for the good
performance of IC engine. Internal buttress threads were made in intake manifold of engine. Three such manifolds of
same configuration with three different pitches and three different types of swirling devices are experimentally checked.
To modify the intake manifold first a 3-D model of actual manifold is made in design software (PTC CREO 3.0) and then
its 2-D sheet was prepared in AUTOCAD for its production in CNC machine. Brake specific fuel consumption (BSFC),
brake thermal efficiency and emission including CO, unburnt HC and NOx is compared amongst the combinations of
inlet manifold having same type of threads with three different types of pitch and three types of swirling device. All
experiments are conducted at different loading conditions using an electric alternator generator and the exhaust analysis
is carried out with the help of multi gas exhaust emission meter. The reported work aims for the selection of combination
of optimum dimension of buttress threads and the optimum swirling device to get best improvement in performance and
emission by producing maximum swirl in inlet air.