论文部分内容阅读
基于FLUENT软件离散相模型及气体助力雾化模型,采用欧拉-拉格朗日方法研究通过Y型喷嘴雾化液氮的雾化特性.由于液氮液滴的蒸发相变,与水相比喷雾锥角更清晰且明显减小,约为10°,喷雾距离缩短.分析喷嘴气液工作压力对液氮雾化索太尔平均直径(SMD)、液滴体积分数和数量分数的影响.结果表明:SMD沿喷射方向变化幅度极小;SMD主要受气相速度及气液比影响,气压低时气相速度影响较大,气压高时气液比影响较大;由于相变作用,液氮雾化粒径分布更为集中.数值研究Y型喷嘴用于不同流量需求的气氮调温器的调温效果,出口温度低于98K,进出口温差达到12K,且整个出口温差在±1K以内,能够实现精确控温要求.
Based on the FLUENT discrete phase model and gas-assisted atomization model, the atomization characteristics of liquid nitrogen atomized by Y-nozzle were studied by Euler-Lagrange method. Due to the phase transition of evaporation of liquid nitrogen droplets, The spray cone angle is clearer and obviously reduced, about 10 °, and the spray distance is shortened.The influence of the gas-liquid working pressure of the nozzle on the atomized atomized diameter (SMD), drop volume fraction and volume fraction of the liquid nitrogen is analyzed. The results show that SMD has a very small variation along the spray direction. SMD is mainly affected by the gas velocity and the gas-liquid ratio. The influence of the gas velocity on the gas pressure is greater when the gas pressure is lower and the gas-liquid ratio is more affected when the gas pressure is higher. Particle size distribution is more concentrated.Numerical study of Y-nozzle nozzle for different flow needs of the thermostat effect of nitrogen and nitrogen thermostat, the outlet temperature is lower than 98K, import and export temperature reached 12K, and the entire outlet temperature difference within ± 1K, Accurate temperature control requirements.