摘要
由于涡轮前温度的不断升高,叶片冷却结构的复杂化、复合化,为改善涡轮冷却叶片在愈发恶劣的工作环境下的抗振特性,建立了多个复合冷却方式涡轮叶片的3维有限元模型。通过对模型进行热-固耦合和振动特性分析,研究了气膜孔的大小、数目、位置、排列、角度对叶片固有频率的影响。结果表明:气膜孔数的增多会导致叶片固有频率的降低,最多降低8.0%;气膜孔的增大对其影响则是不稳定的;其角度和位置的影响可以忽略不计。
Since the increase of the turbine inlet temperature and the complex structure of the turbine cooling blade,a few three- dimensional finite element models of the multiple-cooling turbine blades were established to improve its resistance of vibration characteristic under the poor condition. The effect of the film-holes including its size, number, location, arrangement and angle on the inherent frequency were studied by the analysis of thermal-solid coupling and vibration characteristics. The results show that the inherent frequency of the blade is deceased by the increase of the film-holes, and the maximum of decrease value is 8.0%. The inherent frequency of blade is unstable and invisible by the influence of the size and location for the film-holes.
出处
《航空发动机》
2015年第6期54-58,共5页
Aeroengine
关键词
气膜孔
涡轮叶片
冷却
热固耦合
振动特性
film hole
turbine blade
cooling
thermal-solid coupling
vibration characteristics
