The Numerical Study of the Influences of Working Steam Parameters on Spontaneous Condensing Flow In Transonic Nozzles
In order to study the phenomenon of the steam condensation in transonic expansion flow of a steam ejector,liquid mass fraction and the droplet number density transfer equations were introduced,and the mathematical model was established to describe the flow of wet steam. The numerical simulation of the flow in the nozzle was carried out based on FLUENT 6.3.26,and then was compared with the simulation results,which were obtained under the assumption of ideal gas. It can be found that the outlet temperature of the nozzle is higher than the prediction under the assumption of ideal gas. Meanwhile,the flow speed is higher than that of prediction,which means that the steam condensation has a negative impact on the injection of pumped gas. The spontaneous condensation features in the nozzle were simulated with different working steam parameters. The results show that the working steam pressure and the temperature have a direct influence on the spontaneous condensation in the transonic nozzle,and it is of importance to select steam parameters for the nozzle and the steam ejector so that the working performance can be ensured.
steam ejector spontaneous condensation transonic flow numerical simulation
LEI Hong-jian WANG Xiao-dong DONG Jing-liang YAN Yi YANG Zhi-xue YI Shu
Vacuum and Fluid Research Centre,School of Mechanical Engineering and Automation,Northeastern University,Shenyang 110819 ,China
国际会议
沈阳
英文
379-384
2011-05-22（万方平台首次上网日期，不代表论文的发表时间）