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浙江大学学报(工学版)
浙江大学学报(工学版)  2019, Vol. 53 Issue (6): 1157-1163    DOI: 10.3785/j.issn.1008-973X.2019.06.015
机械与能源工程     
湿蒸汽流场下介入式探针振动数值模拟
胡展豪(),冯俊涛,盛德仁*(),陈坚红,李蔚
浙江大学 热工与动力系统研究所，浙江 杭州 310027
Numerical simulation for vibration of interferometric probein wet steam flow field
Zhan-hao HU(),Jun-tao FENG,De-ren SHENG*(),Jian-hong CHEN,Wei LI
Institute of Thermal Science and Power System,Zhejiang University, Hangzhou 310027, China
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摘要：

介入式探针在汽轮机末级与湿蒸汽流场相互影响，采用双向流固耦合技术对该三元流动问题进行数值分析，研究探针在湿蒸汽流场下的受力情况和振动特性. 利用Workbench平台搭建流固耦合模型，采用基于湍流剪应力输运的k-ω模型以提高计算精度. 计算结果表明：探针在X、Y、Z方向的振动周期略有波动，最大振幅分别为0.28 mm、4.75和5.50 μm. 由于光学探针结构特殊，探针前端测量区域受到压差作用力很小，前端的形变量增长率有所降低. 在振动过程中，探针背流方向约2/3探针长度处应力值最大，该值远低于探针材料的许用应力，且在计算工况下不会引发共振效应.
关键词： 介入式探针;  湿蒸汽两相流场;  振动特性;  双向流固耦合技术;  数值分析    
Abstract:

The bidirectional fluid solid coupling technique was adopted to analyze the three-element flow problem that the interferometric probe interacts with the wet steam flow field at the end stage of the steam turbine. The vibration characteristics and stress of the probe under wet steam flow field were studied. The fluid solid coupling model was built by using Workbench platform. The k-ω model based on turbulent shear stress transport was used to improve calculation accuracy. Results show that the vibration period of the three directions X, Y and Z of probe fluctuate slightly. The oscillation amplitudes in directions X, Y and Z were 0.28 mm, 4.75 μm and 5.50 μm, respectively. Due to the special structure of the optical probe, the pressure differential force acting on the tip of the probe is very small, leading to a decrease in the growth rate of the shape variable at the front end. During probe vibration, the maximum stress position of the probe is about 2/3 of the point in the direction of back flow of the probe, the maximum stress is far below the allowable stress of the probe material, and the resonance effect is not induced in the calculation condition.
Key words: interferometric probe    two-phase wet steam flow field    vibration characteristics    bidirectional fluid solid coupling technique    numerical analysis
收稿日期: 2018-04-10 出版日期: 2019-05-22
CLC:  O 359  
通讯作者: 盛德仁     E-mail: 21727038@zju.edu.cn;shengdr@zju.edu.cn
作者简介: 胡展豪（1995—），男，硕士生，从事两相流光学测量技术研究. orcid.org/0000-0002-8812-4635. E-mail： 21727038@zju.edu.cn
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胡展豪
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李蔚

引用本文:

胡展豪,冯俊涛,盛德仁,陈坚红,李蔚. 湿蒸汽流场下介入式探针振动数值模拟[J]. 浙江大学学报(工学版), 2019, 53(6): 1157-1163.

Zhan-hao HU,Jun-tao FENG,De-ren SHENG,Jian-hong CHEN,Wei LI. Numerical simulation for vibration of interferometric probein wet steam flow field. Journal of ZheJiang University (Engineering Science), 2019, 53(6): 1157-1163.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2019.06.015    或    http://www.zjujournals.com/eng/CN/Y2019/V53/I6/1157

图 1  双向流固耦合数值计算流程图
图 2  探针内部构件分布图
图 3  探针与周围流场的几何模型
图 4  局部网格加密处理的流场结构化网格
图 5  稳态计算探针表面的应力场
图 6  稳态计算探针附近流体的速度场
图 7  探针表面最大压力与网格节点数的关系
图 8  雷诺数约为30 000时的湍流尾迹
图 9  稳态计算得到的探针周围流场流线图
图 10  用于监测探针振动情况的监测点位置
图 11  探针在3个方向上的位移-时间曲线
图 12  探针振动形变云图
图 13  探针中部截面周围流场压力云图
图 14  探针测量部分周围流场压力云图
图 15  探针应力最大时在XZ平面的应力云图
图 16  探针应力最大位置在一个振动周期内的应力
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