OPTIMIZATION OF TIME STEP AND CFD STUDY OF COMBUSTION IN DI DIESEL ENGINE

Patil Vijayendra Maharu, Aashish Agrawal

Abstract: Study of Combustion is one of the complicated phenomenon which involves a chemical reaction at certain elements of fuel like Hydrogen and Carbon combine with Oxygen liberating heat energy and causing and increase in temperature of the gases, within the engine cylinder. IC engines involve complex fluid dynamic interactions between air flow, fuel injection, moving geometries, and combustion. Fluid dynamics phenomena like jet formation, wall impingement with swirl and tumble, and turbulence production are critical for high efficiency engine performance and meeting emissions criteria. The design problems that are encountered include port-flow design, combustion chamber shape design, variable valve timing, injection and ignition timing, and design for low or idle speeds. In Internal combustion Engines CFD may be useful to study one of the most complicated process of combustion in Engines. In this paper a CFD in-cylinder combustion analysis are carried out on a single cylinder four stroke Direct Injection (DI) Engine. The engine is 661cc Kirloskar engine. One of the main process in CFD Analysis is the Grid Generation and defining Time step for solving the problem. Proper and improve grids will give better and accurate results, Grid Independence study has been carried out. The optimum grid is find out in previous work current work is to find optimum time step for CFD analysis three cases are studied with variation in time step from TS 1, TS 0.5 and TS 0.25 the computed data is validated with Experimental data available which are in good agreement

Keywords: Time step Optimization, CFD Combustion Analysis and IC Engine Combustion

DOI: https://doi.org/10.15623/ijret.2014.0320006