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Effect of port gas injection on in-cylinder stratification in a CNG fuelled SI engine

Garg, Manish and Ravikrishna, RV (2014) Effect of port gas injection on in-cylinder stratification in a CNG fuelled SI engine. In: PROGRESS IN COMPUTATIONAL FLUID DYNAMICS, 14 (4). pp. 244-258.

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Official URL: http://dx.doi.org/ 10.1504/PCFD.2014.063865

Abstract

The concept of barrel stratification of air-fuel mixture is evaluated for a port gas injection (PGI) single cylinder spark ignition (SI) internal combustion (IC) engine using a transient three-dimensional computational fluid dynamic (CFD) model. The gaseous fuel used in the study is compressed natural gas (CNG). It is observed that compared to the premixed gas carburettor case, a substantial amount of in-cylinder stratification can be achieved with port gas injection system. A detailed parametric study is reported to understand the effect of the various injection parameters such as injection location, injection orientation, start of injection (SOT) and its duration, and injection rate. Furthermore, the best injection timing is evaluated for various load and speed cases. It is observed that the best stratification pattern can be achieved at 50% engine load. The injection location is observed to have a profound effect on the in-cylinder stratification pattern, and injection towards the side of the spark plug is observed to give a rich fuel-air mixture near the spark plug. It is also shown that there exists an optimal injection pressure.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the INDERSCIENCE ENTERPRISES LTD, WORLD TRADE CENTER BLDG, 29 ROUTE DE PRE-BOIS, CASE POSTALE 856, CH-1215 GENEVA, SWITZERLAND
Keywords: internal combustion engine; compressed natural gas; CNG; computational fluid dynamics; CFD; air-fuel stratification; axial stratification; barrel stratification; port gas injection; PGI
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Depositing User: Id for Latest eprints
Date Deposited: 06 Sep 2014 06:26
Last Modified: 06 Sep 2014 06:26
URI: http://eprints.iisc.ac.in/id/eprint/49774

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