旋流雾化喷嘴内气液两相流动的特性研究

采用试验和数值模拟相结合的方法，对旋流雾化喷嘴内部气液两相流动特性进行研究，揭示旋流雾化喷嘴内部的流动机理，有效预测其雾化特性。计算模型采用雷诺应力(RSM)湍流模型和欧拉-欧拉(Euler-Euler)两相流模型。结果表明，当气液体积比为600、气体流量小于25 m3/h时，模拟计算结果与试验数据吻合较好。在喷口内部，由于流通截面的减小，二甘醇的切向速度迅速增大，在喉部区域达到峰值，流经喉部后，由于流通面积的增加，切向速度呈减小趋势。随着气体流量的增加，二甘醇的射程越来越远，当气体流量分别为15，20，30 m3/h时，二甘醇的分配不均匀度分别为27.94%，26.05%，33.42%，呈现先减小后增大的趋势。

STUDY ON CHARACTERISTICS OF GAS-LIQUID TWO-PHASE FLOW IN SWIRL ATOMIZING NOZZLE

By means of experiment and numerical simulation and diethylene glycol as test material, the gas-liquid two-phase flow characteristics in a swirl atomizer nozzle were studied, the flow mechanism in swirl atomizer nozzle was revealed, and the atomizing characteristics in the swirl atomizer nozzle were predicted effectively. The RSM turbulence model and the Euler-Euler multiphase flow model were used in the numerical simulations. The results showed that when the gas/liquid ratio was 600 and the gas flow rate was less than 25 m3/h, the simulation results were in good agreement with the experimental data. Due to the decrease of flowing area, the tangential velocity of diethylene glycol inside the swirl nozzle increased rapidly, and reached a peak value in the throat area. After that, the tangential velocity decreased gradually due to the increase of the flow area. With the increase of gas flux, the speed range of diethylene glycol was farther and farther. When the gas flow rate were 15, 20 and 30 m3/h, the distributing uniformity of diethylene glycol were 27.94%, 26.05% and 33.42%, respectively, showing a trend of decrease first and then increase.