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作者采用基于激光衍射原理的粒径测量仪，在变密度风洞中研究了常温下直喷式柴油机用泵－管－嘴高压供油系统（喷油压力４０～９５ＭＰａ范围）的喷油压力、喷嘴孔径和环境密度对喷雾的粒径及其分布特性的影响。结果表明：喷雾中的索特平均直径ＳＭＤ随喷油压力升高或喷嘴孔径减小而明显下降；采用小孔径喷嘴既有利于提高喷油压力，又有利于全工况范围的雾化改善。喷雾空间粒度分布特征是：ＳＭＤ在喷雾轴线方向呈“两头大，中间小”，在喷雾径向上呈“外边大，内边小”。环境密度增大，ＳＭＤ值上升。
Based on the particle size measuring instrument based on laser diffraction theory, the author studied the injection pressure of pump-pipe-nozzle high pressure oil supply system (injection pressure 40 ~ 95MPa) at room temperature in variable density wind tunnel. Effects of Nozzle Bore and Environmental Density on Spray Particle Size and Its Distribution. The results show that the average diameter of SMD Sox drops obviously with the increase of injection pressure or the decrease of nozzle diameter. The use of a small aperture nozzle not only improves the injection pressure but also improves the atomization of the whole working condition. Spray space particle size distribution is characterized by: SMD in the spray axis was “two big, middle small” in the spray radial was “outside large, small inside.” Environmental density increases, SMD value increases.