TECHNICAL PAPERS: Internal Combustion Engines

Experimental Study on Homogeneous Charge Compression Ignition Combustion With Fuel of Dimethyl Ether and Natural Gas

[+] Author and Article Information
Mingfa Yao

State Key Laboratory of Engine Combustion, Tianjin University, Tianjin 300072, Chinay_mingfa@tju.edu.cn

Zunqing Zheng, Jin Qin

State Key Laboratory of Engine Combustion, Tianjin University, Tianjin 300072, China

J. Eng. Gas Turbines Power 128(2), 414-420 (Sep 22, 2005) (7 pages) doi:10.1115/1.2130731 History: Received February 02, 2004; Accepted September 22, 2005

The homogeneous charge compression ignition (HCCI) combustion fueled by dimethyl ether (DME) and compressed natural gas (CNG) was investigated. The experimental work was carried out on a single-cylinder diesel engine. The results show that adjusting the proportions of DME and CNG is an effective technique for controlling HCCI combustion and extending the HCCI operating range. The combustion process of HCCI with dual fuel is characterized by a distinctive two-stage heat release process. As CNG flow rate increases, the magnitude of peak cylinder pressure and the peak heat release rate in the second stage goes up. As DME flow rate increases, the peak cylinder pressure, heat release rate, and NOx emissions increase while THC and CO emissions decrease.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Schematic of test setup

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Figure 2

Abnormal and normal HCCI process for DME/CNG dual fueled engine

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Figure 3

Effects of CNG on combustion process

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Figure 4

Effects of CNG on burning rates

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Figure 5

Effects of DME on combustion process

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Figure 6

Effects of DME on the temperature in cylinder

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Figure 7

Effects of DME on the first stage heat release

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Figure 8

Effects of DME and CNG proportions on BTE

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Figure 9

Knock limit and lean burning limit

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Figure 10

Effect of DME proportion on THC and CO emissions

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Figure 11

Effects of DME proportion on NOx emissions



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