Theses and Dissertations

Zihan Wang

Issuing Body

Mississippi State University

Advisor

Krishnan, Sundar

Committee Member

Srinivasan, Kalyan

Committee Member

Som, Sibendu

Date of Degree

8-11-2012

Document Type

Graduate Thesis - Open Access

Major

Mechanical Engineering

Degree Name

Master of Science

College

James Worth Bagley College of Engineering

Department

Department of Mechanical Engineering

Abstract

Diesel and biodiesel combustion in a light duty compression ignition engine were simulated during a closed cycle, using a commercial computational fluid dynamics (CFD) code, CONVERGE. The corresponding computational domain was constructed for the engine based on combustion chamber geometry and compression ratio measurements. Submodels were calibrated for simulation. The results were able to capture the experimental pressure and apparent heat release rate trends for both fuels over a range of engine loads and fuel injection timings. NOx emissions trends were captured for diesel, while under-predicted for biodiesel. The NOx trends were also analyzed based on the thermal NO mechanism. A new modular tool in Matlab was developed for studying the residence time. It was found that high in-cylinder temperatures and their residence time are critical in NOx formation.

URI

https://hdl.handle.net/11668/19776

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