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초록· 키워드

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Direct injection spark ignition engines can achieve better thermal efficiency by applying stratified fuel concentration in the combustion chamber. The purpose of this study is to clarify the combustion in such inhomogeneous fuel concentration field. The combustion of inhomogeneous fuel concentration field in a cylindrical constant volume vessel was fundamentally investigated axisymmetrically. A swirling fuel-air mixture was produced in the vessel. A rich fuel concentration was formed near the center of the vessel by the injection of propane. The mixture was ignited at the center of the vessel. The experimental runs were done under various conditions at fuel distribution and swirl flow at the ignition timing. The fuel concentration distribution at the ignition timing was measured using laser-induced fluorescence. The gas flow field was obtained with a laser Doppler velocimeter in advance. The pressure history in the combustion chamber was analyzed to determine the combustion characteristics. Furthermore, a high-speed video camera was used to capture the flame development. The flame can propagate and the combustion occurs even in an ultra lean mixture of equivalence ratio of 0.3 in total. As the fuel concentration near the spark location approximates stoichiometric, flame propagation of the initial stage of the combustion becomes faster under an ultra lean mixture condition.

목차

Abstract

1.Introduction

2.Experimental Method

3.Gas Flow Field

4.Concentration Field

5.High-Speed Photographs of Flame Propagation

6.Combustion Efficiency

7.Combustion Characteristics

8.Summary

Acknowledgement

References

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UCI(KEPA) : I410-ECN-0101-2009-556-014132321