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建立了平面激光诱导荧光(PLIF)用于燃油分布特性测量的试验装置及其校正方法,并验证了校正方法的有效性.PLIF和平面激光散射(PLS)方法的燃油分布特性测量结果表明PLS方法对直径小于50μm的液滴存在非线性效应使小液滴集中区燃油分布测量结果偏大,PLIF方法适合燃油分布特性测量.利用PLIF方法从喷雾锥角、燃油周向分布不均匀度和分布指数等方面综合评价燃油空间分布特性.偏心和尺寸大小不等的凹槽等分布不均匀的表现形式表明:造成燃油分布不均匀的因素包括喷嘴内部通道表面粗糙度、喷射孔圆度和零件之间的同轴度.利用PLIF方法研究雾锥在供油压差分别为0.14,0.25,2.5MPa时雾锥沿喷射方向的发展过程,液滴随雾锥发展逐渐从环形集中区分散到整个雾锥横截面,并且液滴分散过程随供油压差增加而加快.
The experimental device and its calibration method of planar laser-induced fluorescence (PLIF) for measuring fuel distribution characteristics were established and the effectiveness of the calibration method was verified.The measurement results of fuel distribution characteristics of PLIF and PLS methods showed that the PLS method The non-linear effect on the droplets less than 50μm in diameter makes the measurement of fuel distribution in the small droplet concentration area larger, and the PLIF method is suitable for the measurement of the distribution of fuel distribution.Using the PLIF method from the spray cone angle, the circumferential unevenness and distribution index And other aspects of the comprehensive evaluation of the spatial distribution of fuel characteristics of eccentric and uneven size uneven distribution of grooves and other forms of expression shows that: uneven distribution of fuel caused by the nozzle surface roughness, jet hole roundness and between the parts Of the coaxiality.Using PLIF method to study the development of the fog cone along the jet direction when the oil supply differential pressure is 0.14, 0.25, 2.5MPa respectively, the droplets gradually disperse from the annular concentration zone to the entire cone Cross-section, and droplet dispersion process with the oil pressure increase and speed up.