摘要
叶片的加工和安装偏差不仅直接影响到涡轮的性能,而且可能对叶片通道内热斑的迁移产生影响。为了研究这种偏差对热斑在涡轮中迁移及叶片热负荷等的影响,本文以某高压涡轮级为例,利用三维非定常数值模拟手段进行了研究。结果表明:动叶安装角的偏差对动叶中热斑的迁移如周向迁移有较明显的影响;而热斑迁移的变化将直接影响涡轮动叶压力面和吸力面的热负荷分布,最终影响涡轮叶片的寿命;并且热斑迁移的变化还导致下游支板通道内温度分布产生较为明显的变化,这有可能给发动机排气温度的测量带来偏差。热斑迁移的变化在涡轮的设计和故障分析中应予重视。
The departures of blade machining and assembly may influence not only turbine performance, but also the migration of hot streak in turbine passage. In order to investigate the influence of these departures on the migration of hot streak and the thermal load of blade, 3-D unsteady numerical simulations of a high pressure turbine stage are carried out. Numerical results indicate that the departure of rotor blade stagger have obvious influence on circumferential migration of hot streak in rotor blade passage. The thermal loads of rotor blades are directly influenced by the changes of hot streak migration and therefore also the life-span of blades. In addition, the change of hot streak migration also result in obvious temperature variations of downstream strut passage, which may lead to measure error of engine exhaust temperature. The change of hot streak migration should be considered in turbine design and failure analyses.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2009年第6期944-948,共5页
Journal of Engineering Thermophysics
基金
国家自然科学基金项目(No.50776003)
国防重点实验室基金项目(No.9140C4103080703)
关键词
动叶安装角偏差
热斑
涡轮
非定常
数值模拟
departure of rotor blade stagger
hot streak
turbine
unsteady
numerical simulation
