Aerothermal Investigations of Tip Leakage Flow in Axial Flow Turbines-Part I: Effect of Tip Geometry and Tip Clearance Gap

A numerical study has been performed to investigate the effect of tip geometry oil the tip leakage flow and heat transfer characteristics in unshrouded axial flow turbines. Base line flat tip geometry and squealer type geometries, namely, double squealer or cavity and suction-side squealer, were considered. The performances of the squealer geometries, in terms of the leakage mass flow and heat transfer to the tip, were compared with the flat tip at two different tip clearance gaps. The computations were performed using a single blade with periodic boundary conditions imposed along the boundaries in the pitchwise direction. Turbulence was modeled using three different models, namely, standard k-epsilon, low Re k-omega, and shear stress transport (SST) k-omega, in order to assess the capability, of the models in correctly predicting the blade heat transfer The heat transfer and static pressure distributions obtained using the SST k-omega model were-found to be in close agreement with the experimental data. It was observed that compared to the other two geometries considered, the cavity tip is advantageous both from the aerodynamic and from the heat transfer perspectives by providing a decrease in the amount of leakage, and hence losses, and average heat transfer to the tip. In general, for a given geometry, the leakage mass flow and the heat transfer to the tip increased with increase in tip clearance gap. Part II of this paper examines the effect of relative casing motion on the flow and heat transfer characteristics of tip leakage flow. In, Part III of this paper the effect of coolant injection on the flow and heat transfer characteristics of tip leakage flow is presented.