Abstract
Fuel atomization is known as one of the most effective way to reduce both exhaust emission and fuel consumption of spark ignition engines. Authors have studied an influence of turbulence upstream of a nozzle on the fuel atomization, which is effective for improving the fuel atomization. This paper discusses an experimental investigation of the turbulence on the fuel atomization using a silicon plate nozzle (SPN) with a sharp edge inlet and aperture size of 100 μm or less. Here, the basic configurations of the SPN, that is, its aperture size and sharpness of the edge were changed so as to investigate characteristics of the fuel atomization for the respective cases. The characteristics of the fuel atomization were also investigated in case of superposing two SPNs and combining the SPN with a needle valve. As a result, it is clarified that the fuel atomization cannot be improved by merely reducing the orifice aperture size, and the turbulence upstream of the nozzle is also effective for the SPN with a small aperture.
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