超音速气雾化中导液管突出长度对气体流场的影响

Effect of protrusion length of melt delivery tube on gas flow field for supersonic gas atomization

利用计算流体动力学Fluent软件模拟导液管突出长度对超音速气雾化喷嘴气体流场的影响以及对流场中心线上压强、速度和温度等的影响规律。结果表明:气流场中存在一系列膨胀波及压缩波,并随着导液管突出长度的增加,马赫碟的强度逐渐增加;随着突出长度逐渐变大,抽吸压力逐渐减小,成为负压;滞点和马赫碟的出现对气流速度和温度有较大的影响;导液管顶端径向分布的静压强存在一个压强梯度,并且随着导液管突出长度的增加而减小。

The effect of protrusion length of melt delivery tube on the gas flow field for supersonic gas atomization was analyzed numerically by using a computational fluid dynamics software Fluent. The influence of protrusion length on the static pressure, velocity magnitude and temperature of the central axis of the flow field was also examined. The results indicate that a series of expansion and compression waves are present in the flow field. With increasing protrusion length of melt delivery tube, the strength of Mach disk increases and the aspiration pressure decreases. The presence of stagnation point and Math disk has a remarkable influence on the velocity and temperature of gas flow. A radical pressure gradient exists along the tip of the delivery tube and decreases with increasing protrusion length.