矿井降尘超声雾化喷嘴空化流动特性仿真研究

摘要

Based on computational fluid dynamics (CFD) method,we used automatically generate hybrid grid and two-phase flow fluid cavitation turbulent model to carry out the numerical simulation research on unsteady of pipe flow pattern of cavitation Hartmann type ultrasonic atomization nozzle.Simulation results reveal the ultrasonic atomization nozzle type pipe flow cavitation mechanism and the flow characteristics of cavitation bubble,predict the cavitation of ultrasonic atomization nozzle position and degree.The cavitation intensity of internal nozzle and nozzle mouth lateral is larger,and there is no cavitation phenomenon in resonant cavity,which just plays a role of crushing effect of cavitation bubble.The influence of air volume fraction and cavitation intensity was lower after the inlet pressure was greater than 3 MPa.%基于计算流体动力学(Computational fluid dynamics,CFD)方法,应用自动生成网格技术,采用两相流混合流体完整空化湍流模型;对矿用Hartmann型超声雾化喷嘴的管流型空化进行非定常数值模拟研究.模拟结果揭示超声雾化喷嘴管流型空化发生机理和空化泡的流动特性,预测超声雾化喷嘴的空化产生部位和程度;喷嘴内部和喷嘴口外侧空化强度较大,谐振腔内部无空化现象,只是起到空化泡的破碎作用;进口压力大于3 MPa后对气相体积分数和空化强度影响较小.