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Article: Effects of low Reynolds number on wake-generated unsteady flow of an axial-flow turbine rotor.
- Article from:
- International Journal of Rotating Machinery
- Article date:
- January 1, 2005
- Author:
CopyrightCOPYRIGHT 2005 Hindawi Publishing Corp. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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The unsteady flow field downstream of axial-flow turbine rotors at low Reynolds numbers was investigated experimentally using hot-wire probes. Reynolds number, based on rotor exit velocity and rotor chord length [Re.sub.out, RT], was varied from 3.2 x [10.sup.4] to 12.8 x [10.sup.4] at intervals of 1.6 x [10.sup.4] by changing the flow velocity of the wind tunnel. The time-averaged and time-dependent distributions of velocity and turbulence intensity were analyzed to determine the effect of Reynolds number. The reduction of Reynolds number had a marked influence on the turbine flow field. The regions of high turbulence intensity due to the wake and the secondary vortices ...