摘要
采用全周非定常数值方法,对末级动叶长1.2 m的全转速汽轮机低压末两级内部流动进行了非定常数值分析,研究了涡轮级叶片表面气动载荷非定常变化及脉动特征,并通过频域分析研究了非定常流动扰动特征在对级内上、下游流动的扰动程度.结果表明,汽轮机长叶片级静叶中,非定常气动脉动载荷从根都到顶部逐渐增加,动叶则呈相反趋势;尾缘斜激波诱导的周向压力不均匀是下游叶片表面气动载荷变化的最主要诱导源.
Numerical simulation on the unsteady flow in the final two stages of a full speed steam turbine LP cylinder, with rotor blade height being 1200 mm, is carried out. Full channels domain and sliding grid method are used in the computation. Unsteady variation and blade aerodynamic loading fluctuation behaviors of the turbine stages are investigated. Unsteady disturbances and their influences on the upstream and downstream unsteadiness are also investigated using FFT method. Results show that for the long blade turbine stage investigated along spanwise, unsteady blade loading fluctuation increases in stator and decreases in rotor. Meanwhile, pressure distortion along circumferential direction induced by trailing among all the disturbance sources. edge shock of upstream blade row is the dominant one
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2013年第12期2253-2257,共5页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.51006011)
关键词
长叶片
气动载荷
非定常
脉动
long blade
aerodynamic loading
unsteady
fluctuation
