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ISSN: 1045-5110 Print
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Pages: 98
| Article price - $35.00 |
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INTERACTING-SPRAYS INJECTION: A NEW CONCEPT FOR NOx AND SMOKE REDUCTION IN DIESEL ENGINES
B. Chehroudi
Engineering Research Corporation, P.O. Box 1718, Lancaster, California, USA
K. M. Sinko
GM Electro-Motive Division, LaGrange, Illinois, USA
W. J. Minkowycz
Department of Mechanical Engineering (M/C251), University of Illinois at Chicago, Chicago, IL 60607
S. Shih
Honda R&D, Raymond, Ohio, USA
ABSTRACT
In the past decade many in-cylinder injection approaches have been proposed for simultaneous reduction of NOx and smoke in diesel engines, with various degrees of success in operation. In this article, some results from a novel and promising technique referred to as the interacting-sprays injection concept is presented. A single-cylinder compression-ignition two-stroke research engine with optically accessible head mounted on a high-speed CFR (cooperative fuel research) engine crankcase is used to investigate the combustion and emission characteristics of this injection system. The interacting-sprays injection system produces two separate, independently controlled liquid fuel spray injections with a good degree of adjustability with regard to their fuel quantities and injection timings. The impingement schedule of the two sprays on each other at the right time and place inside the combustion chamber is the key to the success of the interacting-sprays injection system. Results are presented that show the effects of the varied injection system characteristics on the combustion and exhaust emissions (NOx and smoke). The effects of the injection timing and time separation between the first and second injections of the interacting-sprays injection system are explored. Conditions are identified for which a favorable influence on both smoke and NOx production is observed. A promising and new injection system and strategy are therefore proposed as a result of the data acquired in this study.
pages 673-690
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