IMPROVEMENT OF SPRAY PERFORMANCE OF A LOW-PRESSURE ATOMIZER BY CONICAL SHEET FORMATION

The conventional swirl-type injector used as a single-point injector h as some faults, in that at low fuel flow rate it becomes difficult to generate a thin fuel film, and spray characteristics deteriorate. A ne w type of single-point injector is proposed in this paper to solve the above problem and to improve its atomization performance. The newly d esigned injector is of the impingement type. Liquid fuel jets impinge on the solid wall and form thin liquid films; then they are issued fro m the injector. This type of injector has the following advantages. Th e impingement-type injector can generate a thin liquid film even at a lower liquid flow rate. The liquid film issued from the impingement-ty pe injector is thinner and spreads out more widely. The droplets gener ated by the disintegration of the thin liquid film are finer. The azim uthal mass flux distribution of droplets is more uniform. The upwash g enerated by the impingement of the films promotes film spreading. Howe ver, a large upwash checks the uniform azimuthal distribution of dropl et mass flux.