副室付火花点火機関の燃焼特性 : 副室位置の影響

概要

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For the purpose of examining the effect of prechamber position or torch jet direction on the combustion characteristics and engine performances, a spark ignition engine with a vertical or horizontal prechamber is used to measure to cylinder pressure and the engine output by changing the sectional area of torch nozzle, prechamber volume and air-fuel ratio, while keeping the ignition timing at MBT and the engine speed and the volumetric efficiency constant. Typical pressure-crank angle diagrams selected among many others are analysed to determine the combustion characteristics such as the ignition delay, the end of combustion period and the heat release rate. To explain the large difference of combustion characteristics between the vertical and horizontal prechamber engine, the flame propagation in each combustion chamber is measured by the ion-current method and also the torch flow patterns remained on the piston head are visualized by the oil film method. As a result, the effect of prechamber position on the combustion characteristics can be made clear, and the relationship between the combustion characteristics and the engine performances for each engine with vertical or horizontal prechamber can also be evaluated.
東海大学の論文