정상유동장치 안에서의 고압 가솔린 분사기의 연료분무 특성

Abstract

The direct injection into the cylinders has been regarded as a way of the reduction in fuel consumption and some pollutant emissions. Its spray is of paramount importance in that the primary atomization process must meet the requirement of quick and complete evaporation and combustion. The spray geometry must be stable and compact showing controlled mixture formation by taking a benefit from in-cylinder charge flows. The interaction between flow and injector spray was investigated in a steady flow system embodied in a wind tunnel to simulate the variety of flow inside the cylinder of the direct-injection spark ignition engine. The spray developments in flowing fields with the mean velocity up to 17m/s were at first identified by spray visualization. The direct Mie scattered images and Shadowgraph images presented the macroscopic view of the liquid sprays and the spatial distribution of vapor fields. The microscopic characteristics of the spray were investigated by the velocity and particle size measurements using a phase Doppler anemometer (PDA).