叶栅通道内湿蒸汽非平衡凝结流动的数值模拟

发布时间：2018-01-04 11:09

本文关键词：叶栅通道内湿蒸汽非平衡凝结流动的数值模拟　出处：《化工学报》2016年05期 　论文类型：期刊论文

【摘要】：过冷度是各种凝结现象产生、发展的直接驱动力,叶栅通道内湿蒸汽成核过程通常集中在喉部下游很窄的区域内,水滴数目和水滴半径分布则受到边界层和尾迹影响。针对叶栅通道内跨音速非平衡凝结流动参数分布陡峭、变化敏感的特点,采用具有较好激波捕获效果的高分辨率二阶TVD格式进行离散。利用时间推进法对控制方程进行求解,建立了凝结流动的数值解法,模拟与实验结果相吻合,验证了模型的准确性。研究了叶栅通道内非平衡凝结流动的基本物理现象,讨论了进口过冷度对凝结特性的影响,归纳了叶栅通道内压力、成核率、水滴数、水滴半径、蒸汽湿度的变化规律。研究表明:进口过冷度对非平衡凝结流动特性有重要影响。
[Abstract]:Undercooling is various condensation phenomenon, the direct driving force for the development of the cascade passage of wet steam in the nucleation process is usually concentrated in the downstream of the throat in a narrow range of droplet number and droplet radius distribution is affected by the boundary layer and wake effects. For in cascade transonic non equilibrium condensation flow parameter distribution of steep change, sensitive, high resolution two order TVD scheme has good shock capturing effect are discrete. The governing equations are solved by using the method of advancing the time, established a numerical solution of condensation flow, simulation coincided with the experimental results, to verify the accuracy of the model. The basic physical phenomenon of cascade nonequilibrium condensation flow, discussed the inlet subcooling on condensation characteristics, summed up the pressure in the cascade passage, nucleation rate, droplet number, droplet radius, variation of steam humidity studies: The inlet undercooling has an important influence on the characteristics of non-equilibrium condensing flow.

【作者单位】：华北电力大学电站设备状态监测与控制教育部重点实验室;
【基金】：国家自然科学基金项目(51576066) 中央高校基本科研业务费专项资金项目(2015MS107)~~
【分类号】：O35
【正文快照】： 引言湿蒸汽非平衡凝结流动广泛存在于航空、化工、发电等工程领域,在动力推进、气液分离、动力机械节能等方面有着较高的应用价值。电站汽轮机通流部分在长期水蚀作用下,出现流动效率降低,机组经济性变差等问题,叶片长期工作在湿蒸汽工况下,还可能出现断裂[1]。Baumann[2]指出

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