This paper reports on the experimental investigation of the flame lift-off length for five different orifice diameters (.0.100, .0.130, .0.160, .0.190, and .0.227 mm) of a diesel injector nozzle. The flame lift-off was determined from the measurement of 308 nm OH chemiluminescence for different fuel injection pressures using commercial diesel fuel and a Common Rail fuel injection equipment of passenger car size. The fuel injection pressures were 450, 900, and 1350 bar. The experiments were conducted at air pressures of 30, 50, 70, and 90 bar and at an air temperature of 750 K in a constant pressure spray chamber. It was observed that the flame lift-off length increases with increased injection pressure and increased orifice diameter. PLIF平面激光誘導(dǎo)熒光火焰燃燒檢測(cè)系統(tǒng) 汽車發(fā)動(dòng)機(jī)多參量測(cè)試系統(tǒng)