Internal Combustion Engines

Experimental Study of Low Temperature Diesel Combustion Sensitivity to Engine Operating Parameters

[+] Author and Article Information
G. P. McTaggart-Cowan, S. Cong, C. P. Garner

 Loughborough University, Loughborough, LE11 3TU, UK

E. Wahab

Ford Motor Company, Dounton Basildon, SS15 6EE, UK

M. Peckham

Cambustion Ltd., Cambridge, CB1 8DH, UK

J. Eng. Gas Turbines Power 134(8), 082805 (Jun 21, 2012) (11 pages) doi:10.1115/1.4006377 History: Received October 14, 2011; Revised March 04, 2012; Published June 21, 2012; Online June 21, 2012

This work elucidated which engine operating parameters have the greatest influence on Low temperature diesel combustion (LTC) and emissions. Key parameters were selected and evaluated at low and intermediate speed and load conditions using fractional factorial and Taguchi orthogonal experimental designs. The variations investigated were: about ± 5% in EGR rate, fuel injection quantity and engine speed respectively; and ± 10 °C in intake charge temperature. The half-fractional factorial results showed that the interactions among these parameters were negligible for a specific load/speed point. The Taguchi orthogonal method could be used as an efficient DoE tool for studying the multi-parameter ‘small-scale transients’ that a diesel engine would be likely to encounter when operating in LTC modes. LTC showed the most significant sensitivity to EGR rate variations, where an increase from 60% to 63% in EGR rate doubled THC and CO emissions and reduced combustion stability. LTC was also sensitive to the fuel injection quantity with an increase in injected mass lowering the overall oxygen-fuel ratio and thereby increasing THC and CO emissions. These two parameters influenced the oxygen concentration in the intake charge; which was identified to be a decisive parameter for the LTC combustion and emissions. Intake charge temperature affected the total charge quantity trapped in the cylinder and showed noticeable influence on CO emissions for the low speed intermediate load condition. Variations in engine speed showed a negligible influence on the LTC combustion processes and emissions.

Copyright © 2012 by American Society of Mechanical Engineers
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Figure 1

Schematic of experimental system

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Figure 2

Cylinder pressure and heat release rate during low temperature combustion operation of the test engine for baseline conditions in this study

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Figure 3

Plots of the THC and CO emissions over the main factors and the interactive influence of EGR rate with other parameters. The symbols represent the individual emissions data for the whole set of tests; the lines are the average values for the specific factors and levels (1500 r/min 8 mg/cycle, half fractional factorial test).

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Figure 4

Effects of intake oxygen concentration on LTC THC and CO emissions, and CA50 and CoV(IMEP) (1500 r/min 8 mg/cycle, half fractional factorial test)



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