Abstract
Pressure side extensions are effective tip leakage control devices in axial flow turbines. RANS based viscous flow simulations are used to compare a number of potential aerodynamic de-sensitization devices for blade tips. The present study benefits from the past aerodynamic experiments performed in the rotating turbine rig at Penn State by Dey and Camci [14]. After a brief discussion of the computational details, a grid independency study is presented. The current study shows that a significant tip leakage mass flow rate and aerodynamic loss reduction is possible by using proper tip platform extensions located near the pressure side corner of the blade tip. A set of computations with realistic turbine rotor inlet flow conditions are performed in a linear cascade arrangement in the relative frame of reference. The boundary conditions for the computations are obtained from inlet flow measurements performed in Penn State Axial Flow Turbine Research Facility AFTRF.
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