연료 공급관의 가열이 분사연료의 미립화에 미치는 영향에 대한 실험적 연구

This paper presents a strategy to deal with upcoming ULEV regulations. Usually the HC emission is caused by poor fuel atomization during the cold starting and warm-up period. Improvement on fuel atomization is planned by heating the fuel in fuel-rail. In this experiment, the heated fuel-rail system is constructed to investigate the reduction effects on the size of the fuel droplet by fuel heating. The fuel atomization is examined by measuring Sauter Mean Diameter (SMD) of the fuel droplets from three different types (two-hole, pintle, and six-hole) of injector based upon the returnless heated fuel-rail system. The result shows that the six-hole type injector with the heated fuel provides the best fuel atomization result in terms of SMD among three different types of injector.