Study on Dynamic Response and Clearance Characteristics of Steam Turbine Main Steam Valves under Multi-Field Coupling

YANG Wenlong; YUAN Qi; JIANG Shengke

doi:10.7652/xjtuxb202604014

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Study on Dynamic Response and Clearance Characteristics of Steam Turbine Main Steam Valves under Multi-Field Coupling

Special Topic Dynamic Characteristics Research of Key Steam Turbine Components | 更新时间：2026-04-10

- Study on Dynamic Response and Clearance Characteristics of Steam Turbine Main Steam Valves under Multi-Field Coupling
- Journal of Xi'an Jiaotong University Vol. 60, Issue 4, Pages: 175-186(2026)
- 作者机构：
  
  西安交通大学能源与动力工程学院，710049，西安
  陕西省叶轮机械及动力装备工程实验室，710049，西安
  东方电气集团东方汽轮机有限公司，618001，四川德阳
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202604014
  CLC： TK262
- Received：25 August 2025，
  
  Online First：05 January 2025，
  
  Published：10 April 2026
- 稿件说明：
移动端阅览
YANG Wenlong, YUAN Qi, JIANG Shengke. Study on Dynamic Response and Clearance Characteristics of Steam Turbine Main Steam Valves under Multi-Field Coupling[J]. Journal of Xi'an Jiaotong University, 2026, 60(4): 175-186.
DOI：

YANG Wenlong, YUAN Qi, JIANG Shengke. Study on Dynamic Response and Clearance Characteristics of Steam Turbine Main Steam Valves under Multi-Field Coupling[J]. Journal of Xi'an Jiaotong University, 2026, 60(4): 175-186. DOI： 10.7652/xjtuxb202604014.

摘要

针对大功率汽轮机主汽阀在频繁调峰运行中因热力耦合作用易发生变形卡涩，进而影响机组安全性的问题，综合考虑温度梯度与蒸汽流动压力对阀门变形的影响，建立了基于多重参考系与三维有限元的流-热-固耦合模型。采用接触算法处理阀壳与阀杆间隙的接触问题，并应用重叠网格方法模拟阀门快速关闭过程中阀杆的动态运动特性，实现阀门结构强度与接触间隙变形的瞬态计算及分析。研究结果表明：在阀门全开的稳定运行工况下，阀杆和阀壳的最大等效应力分别为376和323 MPa；冷态启动、停机及快速关闭过程中，阀壳与阀杆的最大等效应力分别为414、225、265 MPa和102、141、170 MPa，均满足材料强度设计要求；各工况下阀杆与阀芯间隙均呈不对称分布，其范围在0.56～1.04 mm，且均未发生接触干涉，阀门无卡涩现象。研究所建模型能够准确预测多场耦合下阀门的动态响应与间隙特性，为汽轮机主汽阀的强度评估与防卡涩设计提供了可靠依据。

Abstract

To address the issue of deformation and sticking in high-power steam turbine main steam valves during frequent load-following operation caused by thermo-mechanical coupling，which compromises unit safety，this paper comprehensively considers the effects of temperature gradients and steam flow pressure on valve deformation.A fluid-thermal-structural coupling model based on multiple reference frames and three-dimensional finite element analysis is established.A contact algorithm is employed to address the contact problem in the clearance between the valve housing and the valve stem，and the overset grid method is applied to simulate the dynamic motion characteristics of the valve stem during rapid valve closure.This enables the transient calculation and analysis of both structural strength and clearance deformation.The results indicate that under the stable full-open operating condition，the maximum equivalent stresses on the valve stem and valve housing are 376 and 323 MPa，respectively.During cold start-up，shutdown，and rapid closure processes，the maximum equivalent stresses on the valve housing are 414，225，and 276 MPa，respectively，while those on the valve stem are 376，141，and 102 MPa，respectively，all meeting the material strength design requirements.The clearance between the valve stem and the valve plug under all conditions exhibits an asymmetric distribution，ranging from 0.56 mm to 1.04 mm，with no occurrence of contact interference or valve sticking.The model developed in this study can accurately predict the dynamic response and clearance characteristics of the valve under multi-field coupling，providing a reliable basis for the strength assessment and anti-sticking design of steam turbine main steam valves.

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