Quantitative imaging of equivalence ratios in a natural gas SI engine flow bench using acetone fluorescence

摘要: Although compressed natural gas (CNG) is a gaseous fuel, the mixing process quite different from air-liquid fuel mixing. The aim of this work to understand effect feeding system on mixture homogeneity. Planar laser-induced fluorescence has been used produce quantitative equivalence ratio maps in intake manifold. Fluorescence results excitation doped acetone gas. Its emission proportional mass. Collected images were post processed obtain ratio. This shows difference between continuous injection at low speed and sequential injection. In first part, we present behaviour jet second part displays smaller section duct upstream valve. study clearly stratification obtained with speed. A very homogenous observed for trapped cycle aspirated next cycle.