Abstract
The unsteady flow field within an annular 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 at a very low Reynolds number condition, Re, out=3.60×104 . The obtained data was analyzed from the viewpoints of both absolute (stationary) frame of reference and relative (rotating) frame of reference. The effect of the turbine nozzle wake and secondary vortices on the flow field inside the rotor passage was clearly captured. The nozzle wake and secondary vortices are suddenly distorted at the rotor inlet, because of the three-dimensional distributions of velocity and flow angle around the rotor. The nozzle flow (wake and secondary vortices) and rotor flow (separation, wake, secondary vortices, and tip leakage vortex) interact intensively near the rotor exit.
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