C102 EFFECTS OF FREE-STREAM TURBULENCE INTENSITY ON UNSTEADY MIDSPAN FLOW IN A TURBINE ROTOR AT LOW REYNOLDS NUMBER

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概要

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• The time-dependent unsteady flow at midspan of an axial-flow turbine rotor was investigated experimentally using a laser Doppler velocimetry (LDV) system, focusing on the influence of free-stream turbulence intensity at very low Reynolds number (Re_<out, RT>=3.6×(10)^4). The free-stream turbulence intensity at nozzle inlet was elevated from 0.5% to 9.4% by setting a turbulence-generating sheet. The time-averaged and time-dependent flows were analyzed and the effects of nozzle wake on the flow field inside the rotor were determined qualitatively and quantitatively. The flow separation occurred at the rotor suction surface even under the high turbulence intensity condition because of the low Reynolds number flow. However, the decrease in flow fluctuation was observed at the higher turbulence intensity. The turbulence in the wake region was anisotropy and it exhibited strong Reynolds stress at both the low and high free-stream turbulence intensities.

• 一般社団法人日本機械学会の論文

著者

• Tsutsui Yasukata

  National Institute Of Advanced Industrial Science And Technology (aist)

• Tsutsui Yasukata

  National Institute Of Advanced Industrial Science And Technology

• MATSUNUMA Takayuki

  National Institute of Advanced Industrial Science and Technology (AIST)

• Matsunuma Takayuki

  National Institute Of Advanced Industrial Science And Technology

関連論文

• LDV Measurements of Unsteady Flow within a Turbine Rotor at Low Reynolds Numbers(Special Issue on International Conference on Power and Energy System)
• E106 MICRO GAS TURBINE CO-GENERATION SYSTEM AT SAPPORO CITY UNIVERSITY UNDER SERVICE CONDITIONS(Distributed Energy System-1)
• C102 EFFECTS OF FREE-STREAM TURBULENCE INTENSITY ON UNSTEADY MIDSPAN FLOW IN A TURBINE ROTOR AT LOW REYNOLDS NUMBER

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