Research Papers: Internal Combustion Engines

A Study of the Transition Between Lean Conventional Diesel Combustion and Lean, Premixed, Low-Temperature Diesel Combustion

[+] Author and Article Information
Stephen Busch

 University of Michigan, 1231 Beal Avenue, Ann Arbor, MI 48109sbbusch@gmail.com

Stanislav V. Bohac

 University of Michigan, 1231 Beal Avenue, Ann Arbor, MI 48109sbohac@umich.edu

Dennis N. Assanis

 University of Michigan, 2350 Hayward Street, Ann Arbor, MI 48109assanis@umich.edu

J. Eng. Gas Turbines Power 130(5), 052804 (Jun 06, 2008) (8 pages) doi:10.1115/1.2906177 History: Received November 02, 2007; Revised November 28, 2007; Published June 06, 2008

New diesel combustion modes face difficult challenges with respect to engine-out emissions and transient behavior. Transitions between lean conventional diesel combustion and lean, premixed, low-temperature diesel combustion are investigated with an automotive diesel engine. Effects of fuel pressure on transitional cycles are investigated. Cycle-by-cycle heat release analysis is performed and an exhaust mass flow model is used to obtain cycle-averaged NO concentrations. The behavior of combustion progression and NO emissions during the transitions is discussed. Observed cool-flame behavior is identified and explained.

Copyright © 2008 by American Society of Mechanical Engineers
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Figure 1

Schematic of engine and emission measurements

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Figure 2

Example of NO concentration measurement and cylinder pressure

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Figure 3

Examples of exhaust flow model

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Figure 4

Engine control parameters during a primary transition

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Figure 5

CO2 concentrations and EGR rate for a primary transition

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Figure 6

NO for a primary transition

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Figure 7

Rates of heat release with three primary transitions with three different starting rail pressures

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Figure 8

Averaged NO emission comparison for secondary transitions

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Figure 9

Cylinder pressure near TDC for a primary transition




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