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http://dx.doi.org/10.15435/JILASSKR.2016.21.1.37

An Experimental Study on the Ignition Probability and Combustion Flame Characteristics of Spark-Ignited Direct-Injection CNG  

Hwang, Seongill (기아자동차 부산서비스센터)
Chung, Sungsik (동아대학교 기계공학과)
Yeom, Jeongkuk (동아대학교 기계공학과)
Jeon, Byongyeul (현대자동차 서부산서비스센터, 부산서비스센터)
Lee, Jinhyun (현대자동차 서부산서비스센터, 부산서비스센터)
Publication Information
Journal of ILASS-Korea / v.21, no.1, 2016 , pp. 37-46 More about this Journal
Abstract
For the SI engines, at only full load, the pumping loss has a negligible effect, while at part load conditions, the pumping loss increases. To avoid the pumping loss, the spark-ignited engines are designed to inject gasoline directly into the combustion chamber. In the spark-ignited direct-injection engines, ignition probability is important for successful combustion and the flame propagation characteristics are also different from that of pre-mixed combustion. In this paper, a visualization experiment system is designed to study the ignition probability and combustion flame characteristics of spark-ignited direct-injection CNG fuel. The visualization system is composed of a combustion chamber, fuel supply system, air supply system, electronic control system and data acquisition system. It is found that ambient pressure, ambient temperature and ambient air flow velocity are important parameters which affect the ignition probability of CNG-air mixture and flame propagation characteristics and the injected CNG fuel can be ignited directly by a spark-plug under proper ambient conditions. For all cases of successful ignition, the flame propagation images were digitally recorded with an intensified CCD camera and the flame propagation characteristics were analyzed.
Keywords
CNG; Ignition probability; Visualization system; Flame propagation characteristics;
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Times Cited By KSCI : 2  (Citation Analysis)
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