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TECHNICAL PAPERS

Relating Burning Rate and NO Formation to Pressure Development in Two-Stroke Diesel Engines

[+] Author and Article Information
P. G. Hill, B. Douville

Department of Mechanical Engineering, University of British Columbia, 2324 Main Mall, Vancouver, B. C., V6T 1Z4 Canada

J. Energy Resour. Technol 119(2), 129-136 (Jun 01, 1997) (8 pages) doi:10.1115/1.2794976 History: Received July 26, 1996; Revised February 25, 1997; Online November 06, 2007

Abstract

A multizone thermodynamic method has been developed to determine combustion rate and NO formation from measured cylinder pressures and performance of two-stroke diesel engines. Integral to the analytical method is a nonlinear fit to the combustion chamber heat loss; the fit is consistent with the overall energy balance and with measured fuel consumption rate and exhaust temperature. The method assumes equilibrium combustion properties except for NO, whose relatively slow formation is estimated using the extended Zeldovich mechanism in the post-flame gas during a period of one mixing time. Application of the method to a 2-stroke diesel engine indicates a post-flame mixing time of 0.55 ms or 4 deg crank angle at 1250 rpm, yielding exhaust concentrations of NO considerably less than what would have been expected from equilibrium-then-sudden-freezing considerations.

Copyright © 1997 by The American Society of Mechanical Engineers
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