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The backfire could be caused by the backflow of hot burned gas from the cylinder into the intake port. Especially. in the case of gaseous fuel engines. the possibility of backfire occurrence is higher since the ignition temperature is lower than that of liquid fuel.
In this study. prior to conversion of gasoline engine to LPG engine. the backflow was measured at four different valve timings(type Ⅰ,Ⅱ,Ⅲ,Ⅳ) in a gasoline engine. To quantify the amount of backflow. hot wire anemometry was adopted and its signal was analyzed as the change of temperature and flow in the intake port.
It was found that the backflow was decreased with increasing the engine load. When the intake valve timing was retarded. the backflow was not found nearly and the power was decreased a little at low engine speed.

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Abstract

1.서론

2.실험장치 및 방법

3.실험결과 및 고찰

4.결론

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UCI(KEPA) : I410-ECN-0101-2009-556-014104785