叶栅通道内湿蒸汽非平衡凝结流动的数值模拟

doi:10.11949/j.issn.0438-1157.20151614

化工学报 ›› 2016, Vol. 67 ›› Issue (5): 1806-1813.DOI: 10.11949/j.issn.0438-1157.20151614

叶栅通道内湿蒸汽非平衡凝结流动的数值模拟

韩中合, 韩旭, 李恒凡

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, 河北保定 071003

收稿日期:2015-10-26 修回日期:2016-01-18 出版日期:2016-05-05 发布日期:2016-05-05
通讯作者: 韩中合
基金资助:
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)。

Numerical simulation of wet steam non-equilibrium condensing flow in cascade passage

HAN Zhonghe, HAN Xu, LI Hengfan

Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, North China Electric Power University, Ministry of Education, Baoding 071003, Hebei, China

Received:2015-10-26 Revised:2016-01-18 Online:2016-05-05 Published:2016-05-05
Supported by:
supported by the National Natural Science Foundation of China (51576066) and the Fundamental Research Funds for the Central Universities (2015MS107).

摘要/Abstract

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。

关键词: 湿蒸汽, 叶栅通道, 跨音速, 两相流, 凝结, 热力学

Abstract:

Subcooled degree is the direct drive potential of condensing phenomena happening and developing. The nucleation process of cascade passage sharply occurs in a narrow flow section. Water droplets distribution is affected by boundary layers and wakes. Due to the condensing parameters distribution steep and sensitive, high resolution second-order TVD scheme and time-marching technique were adopted in numerical algorithm. Using numerical algorithm, the condensing parameter distributions was calculated and compared with measured data to verify the accuracy of the numerical algorithm. Basic physical phenomena of non-equilibrium condensing flow and the influence of inlet subcooled degree on the homogenous nucleation were examined. Varying pattern of pressure, nucleation rate, droplets number, droplets radius and wetness were investigated. It was found that the inlet subcooled degree had a significant influence on non-equilibrium phase change in transonic condensing flow.

Key words: wet steam, cascade passage, transonic, two-phase flow, condensation, thermodynamics

中图分类号:

O354

韩中合, 韩旭, 李恒凡. 叶栅通道内湿蒸汽非平衡凝结流动的数值模拟[J]. 化工学报, 2016, 67(5): 1806-1813.

HAN Zhonghe, HAN Xu, LI Hengfan. Numerical simulation of wet steam non-equilibrium condensing flow in cascade passage[J]. CIESC Journal, 2016, 67(5): 1806-1813.

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叶栅通道内湿蒸汽非平衡凝结流动的数值模拟

Numerical simulation of wet steam non-equilibrium condensing flow in cascade passage

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