燃气轮机润滑油管线两相流动及结构响应特性分析

doi:10.6040/j.issn.1672-3961.0.2025.153

摘要/Abstract

摘要： 为避免首台300 MW级F级重型燃气轮机润滑油回油过程中发生气塞,防止管道内不稳定流动导致管线变形,对回油管线的两相流动及结构响应特性进行深入研究。基于剪切应力传输(shear stress transport, SST)k-ω湍流模型和流体体积(volume of fluid, VOF)模型,建立完整回油管线的气液两相流模型,分析不同回油温度及液相率下的管内流动模式、两相流流态及气液分布情况;基于流场仿真数据,建立回油管线流固耦合动力学模型,研究不同流动情况下的管线结构响应特性。结果表明,在回油过程中,管内润滑油的流动形态主要呈现分层流与周向绕流两种流型。在周向绕流作用管段,最大液相率出现在管段终点截面,绕流管段中心区域截面的液相率与回油口液相率均呈正相关。随着润滑油温度升高,管路整体平均液相率降低。当回油口液相率低于0.50时,系统平均液相率与回油口液相率呈正相关关系。经结构力学验证,管道系统及支吊架的结构设计符合应力规范要求。本研究为重型燃气轮机润滑油回油管道的优化设计与安全评估提供理论依据,有效提高燃气轮机运行的可靠性与稳定性。

关键词: 润滑油, 两相流, 流固耦合, 结构响应, 燃气轮机

Abstract: To prevent gas locking and the consequent blockage of the lubricating-oil return pipeline in the first 300 MW-class F-class heavy-duty gas turbine, as well as pipeline deformation induced by unstable internal flow, the two-phase flow and structural response characteristics of the oil return pipeline were systematically investigated. A numerical model of gas-liquid two-phase flow covering the entire oil return pipeline was developed using the shear stress transport(SST)k-ω turbulence model and the volume of fluid(VOF)method. The flow patterns, two-phase flow regimes, and gas-liquid distributions in the pipeline were analyzed under different lubricating-oil temperatures and liquid volume fractions at the oil return inlet. Based on the simulated flow-field data, a fluid-structure interaction dynamic model of the oil return pipeline was subsequently established to investigate the structural response characteristics of the pipeline and its supports under different flow conditions. The numerical results indicated that the lubricating oil in the return pipeline primarily exhibited two characteristic flow patterns, including stratified flow and circumferential swirling flow. In the pipeline section characterized by circumferential swirling flow, the maximum liquid volume fraction occurred at the downstream end cross-section. The liquid volume fraction in the central cross-section of this section was positively correlated with the liquid volume fraction at the oil return inlet. As the lubricating oil temperature increased, the overall mean liquid volume fraction in the pipeline generally decreased. When the inlet liquid volume fraction was below 0.50, the system-averaged liquid volume fraction increased with increasing inlet liquid volume fraction. Structural mechanical analysis further demonstrated that the stress levels in both the pipeline system and its supports satisfied the requirements of the relevant design codes. The findings provided a theoretical basis for the optimal design and safety assessment of lubricating oil return systems in heavy-duty gas turbines and contributed to improving the operational reliability and stability of gas turbine units.

Key words: lubricating oil, two phase flow, fluid-structure interaction, structural response, gas turbines

中图分类号:

TK124

张斌,周广杰,任冠宇,辛公明,刘波. 燃气轮机润滑油管线两相流动及结构响应特性分析[J]. 山东大学学报 (工学版), 2026, 56(5): 173-181.

Zhang Bin, Zhou Guangjie, Ren Guanyu, Xin Gongming, Liu Bo. Analysis of two-phase flow and structural response characteristics in gas turbine lubricating oil pipes[J]. Journal of Shandong University(Engineering Science), 2026, 56(5): 173-181.

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