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TECHNICAL PAPERS: Internal Combustion Engines

Effects of Heat Release Mode on Emissions and Efficiencies of a Compound Diesel Homogeneous Charge Compression Ignition Combustion Engine

[+] Author and Article Information
Wanhua Su

 State Key Laboratory of Engines, Tianjin University, Tianjin 300072, P.R.C.whsu@tiu.edu.cn

Xiaoyu Zhang, Tiejian Lin, Yiqiang Pei, Hua Zhao

 State Key Laboratory of Engines, Tianjin University, Tianjin 300072, P.R.C.

J. Eng. Gas Turbines Power 128(2), 446-454 (Oct 14, 2005) (9 pages) doi:10.1115/1.2032447 History: Received March 03, 2004; Revised October 14, 2005

A compound diesel homogeneous charge compression ignition (HCCI) combustion system has been developed based on the combined combustion strategies of multiple injection strategy and a mixing enhanced combustion chamber design. In this work, a STAR-CD based, multidimensional modeling is conducted to understand and optimize the multiple injection processes. The parameters explored included injection timing, dwell time, and pulse width. Insight generated from this study provides guidelines on designing the multipulse injection rate pattern for optimization of fuel-air mixing. Various heat release modes created by different injection strategies are investigated by experimental comparison of combustion efficiency, heat loss, and thermal efficiency. It is demonstrated that the process of fuel evaporation and mixing are strongly influenced by pulse injection parameters. Through control of the parameters, the stratification and autoignition of the premixed mixture, and the heat release mode can be controlled. The dispersed mode of heat release created only by the compound diesel HCCI combustion is a flexible mode in combustion control. The thermal efficiency with this mode can reach approximately to as high as that of conventional diesel combustion, while the NOx and smoke emissions can be reduced simultaneously and remarkably.

Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic of experimental setup

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Figure 2

Computational grid at TDC used for engine calculations

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Figure 3

Multiple injection profiles

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Figure 4

Effect of fuel injection timing on fuel-air mixture formation: Injection profile 1. (a) Earlier injection, (b) baseline, (c) later injection.

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Figure 5

Equivalence ratio distributions at 40, 20, and 0 deg BTDC. Perspective view. (a) Baseline, (b) later injection.

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Figure 6

Temperature distributions at 40, 20, and 0 deg BTDC. Perspective view. (a) Baseline, (b) later injection.

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Figure 7

Effect of pulse dwell time on fuel-air mixture formation, earlier injection, injection profile 2

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Figure 8

Effect of pulse dwell time on fuel-air mixture formation, baseline, injection profile 2

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Figure 9

Effect of pulse dwell time on fuel-air mixture formation, later injection, injection profile 2

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Figure 10

Effect of pulse dwell time on fuel-air mixture formation, earlier injection, injection profile 3

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Figure 11

Effect of pulse dwell time on fuel-air mixture formation, baseline, injection profile 3

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Figure 12

Effect of pulse dwell time on fuel-air mixture formation, later injection, injection profile 3

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Figure 13

ROHR at low load PCCI operation conditions by means of multiple injections (IMEP=0.32MPa)

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Figure 14

NOx and smoke emissions at low load HCCI operation conditions by means of multiple injections (IMEP=0.32MPa)

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Figure 15

Heat release results of cases B3–B6 (IMEP=0.67MPa)

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Figure 16

NOx and smoke emission results of cases B3–B6 (IMEP=0.67MPa)

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Figure 17

Heat release results of cases C7–C9 (IMEP=0.93MPa)

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Figure 18

NOx and smoke emission results of cases C7–C9 (IMEP=0.93MPa)

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Figure 19

Heat release results of cases D10–D15 (IMEP=0.93MPa)

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Figure 20

Combustion efficiency, heat loss and thermal efficiency of cases D10–D15 (IMEP=0.93MPa)

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Figure 21

uHC and CO emission results of cases D10–D15 (IMEP=0.93MPa)

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Figure 22

NOx and smoke emission results of cases D10–D15 (IMEP=0.93MPa)

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