스월형 가솔린 직분식 인젝터의 분무특성에 대한 수치적 연구

Abstract

In this study, the characteristics of high-pressure swirl injector have been studied using numerical simulation and experiment to investigate the effect of the length of orifice and swirl port on the spray characteristics. Influences of swirl port angle and initial conditions have also been examined in terms of penetration depth and Sauter's mean diameter. Computed results of the spray characteristics are compared with experimental data. The results show that the tangential velocity at the nozzle exit decreases, but the axial velocity increases as swirl port angle is increased. Hence, the static flow rate increases, but the initial spray angle decreases with increasing the swirl port angle. It is also shown that the values of the initial SMD and initial spray angle used as input data for spray simulation influences the penetration depth and SMD. The spray pattern from the present numerical simulation agrees well with experimental result.