摘要
蒸汽喷射泵的操作工况在偏离设计值时,喷射性能会严重恶化。本文借助连续介质力学数值模拟工具-STARCCM+,对三喷嘴蒸汽喷射泵内部流场进行了三维数值模拟。分析了操作参数(背压、工作蒸汽压力和引射蒸汽压力)对其喷射系数的影响,并与相同工况下单喷嘴蒸汽喷射泵进行对比。此外,对三喷嘴蒸汽喷射泵的结构参数(喷嘴轴线的汇交点位置)进行了考察。结果表明,在工作蒸汽变工况操作条件下,三喷嘴蒸汽喷射泵能够保持稳定、可靠运行;在相同工况下,三喷嘴蒸汽喷射泵的临界背压值小于单喷嘴。在多喷嘴蒸汽喷射泵的设计中,各喷嘴轴线的汇交点位置存在一最佳值。
The dynamics of 3-dimensional flow field in three-nozzle steam jet pump was Inathematically modeled and numerically simulated with STAR-CCM ＋ , the software developed in computational continuum mechanics algorithms, to improve its long-term reliability. The impact of the operation conditions, including but not limited to the backing pressure, motive steam pressure, suction steam pressure, and intersection of its nozzle＇ s axes, on entrainment ratio of the three-noz- zle steam jet pump were investigated. The simulated results show that under the off-design conditions, the three-nozzle steam jet pump is capable of working with fairly high stability and reliability, and that its critical backing pressure is smaller than that of the single nozzle steam ejector pump. Besides, under the specified operation conditions, the three noz- zles can be aligned in such a way that their axes focus at an optimized position.
出处
《真空科学与技术学报》
EI
CAS
CSCD
北大核心
2015年第1期49-56,共8页
Chinese Journal of Vacuum Science and Technology
基金
河北省科学技术研究与发展计划项目(12276711D)
关键词
蒸汽喷射泵
计算流体力学
数值模拟
三喷嘴
喷射系数
Steam ejector, Computational fluid dynamics, Numerical simulation, Three nozzles, Entrainment ratio
