燃料抛撒中液体颗粒尺寸的研究

Investigation of the Liquid Particle Size in the Fuel Dispersion

利用激光散射仪和纹影仪观测了水的抛撒首次破碎和二次破碎中的液体颗粒尺寸 ,并对水的抛撒二次破碎中的液体颗粒尺寸进行了数值模拟计算。实验观测表明 :水的抛撒二次破碎中 ,在固定位置测量到的云雾区液体颗粒Sauter平均直径随测量时间的增加呈现出减小的趋势 ;而云雾区的宽度随着与抛撒中心的距离增大而呈现出增加的趋势 ;云雾区前缘的液体颗粒Sauter平均直径则随着与抛撒中心的距离增大而呈现出先逐渐增大然后迅速减小的趋势 ,这与数值模拟计算结果基本一致 ;水的抛撒首次破碎过程中 。

Both the experiments performed by use of the laser light scattering apparatus and the schlieren apparatus and the numerical simulation of the secondary breakup of water in the dispersion are presented in this paper. The experimental results show that during the secondary breakup of water in the dispersion the Sauter mean diameter of liquid particles measured at the fixed position in the atomization area becomes smaller as time increases. The width of the atomization area becomes larger as the distance from the center of water dispersion increases, the Sauter mean diameter of liquid particles in the front of atomization area decreases rapidly after increasing gradually as the distance increases,which is in good agreement with the result derived from the numerical simulation, and the diameter of liquid particle in the primary breakup of water in the dispersion has the order of centimeter.