Visualization of In-Cylinder Flow of a Gasoline HCCI Engine Using Blowdown Supercharging System by PIV Method

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  • PIV法によるブローダウン過給ガソリンHCCI機関の筒内流動の可視化

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The objective of this research is to investigate the effect of the EGR guide, employed to generate a strong in-cylinder thermal stratification, on the recharged EGR gas flow into the cylinder in a gasoline HCCI engine equipped with the blowdown supercharging (BDSC) system. The recharged EGR gas flow was visualized using an optical access engine. A steady gas flow and an unsteady gas flow in motoring from the exhaust port into the cylinder were visualized via PIV method. The effect of the pressure difference between the exhaust port and the cylinder and the geometry of the EGR guide on the recharged gas flow was investigated. The results indicate that the flow field pattern is largely affected by the EGR guide height, and that an increase in the EGR guide height is effective to generate a strong in-cylinder thermal stratification. And then, the reduction of maximum pressure rise rate (dp/dθ) was investigated with a larger EGR guide height. Also, the in-cylinder thermal stratification was investigated by numerical simulation. The results indicate that thermal stratification gets stronger by a higher EGR guide. However, it was found that the reduction of maximum pressure rise rate takes a peak at a height of EGR guide.

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