Effects of Nozzle Secondary Vortices on Unsteady Hub-Endwall Flow of a Turbine Rotor
The unsteady flow field of an axial-flow turbine rotor was investigated experimentally using an LDV system. Detailed measurements of the time-averaged and time-dependent distributions of the velocity, the flow angle, and the turbulence intensity were carried out. The obtained data was analyzed from the viewpoints of both absolute (stationary) frame of reference and relative (rotating) frame of reference. This paper focuses on the effect of the turbine nozzle secondary vortices (a passage vortex and a trailing edge vortex) near the hub endwall on the flow field inside the rotor passage. The nozzle passage vortex are accumulated on the rotor suction surface because of both the negative jet effect of the nozzle passage vortex itself and the formation of the rotor passage vortex. The nozzle passage vortex induces large fluctuations of velocity and turbulence intensity inside the rotor.
Turbine Unsteady flow Nozzle-rotor interaction Laser Doppler velocimetry Secondary vortices Hub endwall
Takayuki Matsunuma
National Institute of Advanced Industrial Science and Technology (AIST) 1-2-1 Namiki, Tsukuba, Ibaraki, 305-8564, Japan
国际会议
2007杭州国际动力工程会议(The International Conference on Power Engineering 2007)
杭州
英文
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）