Numerical simulation for vibration of interferometric probein wet steam flow field

doi:10.3785/j.issn.1008-973X.2019.06.015

Journal of ZheJiang University (Engineering Science)

2019, Vol. 53

Issue (6): 1157-1163 DOI: 10.3785/j.issn.1008-973X.2019.06.015

Mechanical and Energy Engineering

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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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

Received: 10 April 2018 Published: 22 May 2019

CLC:	O 359
	TK 14

Corresponding Authors: De-ren SHENG E-mail: 21727038@zju.edu.cn;shengdr@zju.edu.cn

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Cite this article:

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.

URL:

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

湿蒸汽流场下介入式探针振动数值模拟

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

Fig.1 Flow chart of bidirectional flow solid couplingnumerical calculation

Fig.2 Distribution diagram of probe internal components

Fig.3 Geometric model of probe and surrounding flow field

Fig.4 Flow field structured meshes with local meshes densification

Fig.5 Stress field on surface of probe on steady statecalculation

Fig.6 Velocity field of fluid near probe on steady state calculation

Fig.7 Relationship between maximum pressure on probesurface and number of mesh nodes

Fig.8 Turbulent wake form with Reynolds number ofabout 30 000

Fig.9 Flow field diagram around probe of steady statecalculation

Fig.10 Location of monitoring point used for monitor probe vibration

Fig.11 Displacement-time curve of probe in three directions

Fig.12 Probe vibration deformation cloud picture

Fig.13 Pressure cloud picture of flow field around centralsection of probe

Fig.14 Pressure cloud picture of flow field around measurement section of probe

Fig.15 Probe’s stress cloud picture on XZ plane at maximum stress

Fig.16 Stress of probe’s maximum stress position within one vibration period


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