横流作用下气液两相环状流射流液膜的雾化特性实验研究

In order to better understand the effects of the crossflow on the atomization of the gas-liquid annular flow jet, the characteristics of the breakup and atomization of the liquid film of the gas-liquid annular flow jet in the crossflow were experimentally investigated by using high speed photography technology in the present work. It is found that the gas-liquid annular flow jet can realize stable atomization in the crossflow, and the breakup and atomization of the jet liquid film have the features of periodicity and discontinuity. Three distinct breakup modes for the annular flow jet liquid film are clarified, namely the burst breakup mode, the segmental breakup mode and the annular film breakup mode. The characteristics of the liquid film evolution of the jet for each breakup mode are studied. The flow dynamic conditions for different breakup modes of the jet liquid film are obtained based on experimental statistical analysis. Furthermore, the diameter distributions of the droplets that came from different breakup stages of the liquid film of the annular flow jets are statistically analyzed quantitatively and the results show that among the three breakup modes, the burst breakup of the jet liquid film will produce more smaller droplets and achieve the best atomization quality. In addition, the increase in the superficial gas velocity of the annular flow as well as the velocity of the crossflow can also improve the atomization performance of the annular flow jet liquid film.