副室式ガス機関の炭化水素の排出特性

概要

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The characteristics of unburned HC from a prechamber were studied using a small sized single cylinder engine and a constant-volume combustion rig. It is thought that HC in exhaust gas is unburned fuel from a crevice volumes between a liner and a piston and between a liner and a head. When the compression ratio is higher, a ratio of the crevice volume to the combustion chamber is higher and HC increases. When the crevice volume reduces, the thermal efficiency improves because unburned fuel HC and CO reduce. When a hole angle of the prechamber is made larger, HC decreases. The flame jet from the larger hole angle can reach the liner wall. When the swirl intensity decreases, the thermal efficiency improves and NO_x decreases, but HC increases. The flame jet is disturbed by the swirl and the flame propagates to the liner wall.
一般社団法人日本機械学会の論文
1994-01-25