Heat Transfer Predictions for Two Turbine Nozzle Geometries at High Reynolds and Mach Numbers

Abstract

Predictions of turbine vane and endwall heat transfer and pressure distributions are compared with experimental measurements for two vane geometries. The differences in geometries were due to differences in the hub profile, and both geometries were derived from the design of a high rim speed turbine (HRST). The experiments were conducted in the Isentropic Light Piston Facility (ILPF) at Pyestock at a Reynolds No. of 5.3 × 106, a Mach No. of 1.2, and a wall-to-gas temperature ratio of 0.66. Predictions are given for two different steady state three-dimensional Navier-Stokes computational analyses. C-type meshes were used, and algebraic models were employed to calculate the turbulent eddy viscosity. The effects of different turbulence modeling assumptions on the predicted results are examined. Comparisons are also given between predicted and measured total pressure distributions behind the vane. The combination of realistic engine geometries and flow conditions proved to be quite demanding in terms of the convergence of the CFD solutions. An appropriate method of grid generation, which resulted in consistently converged CFD solutions, was identified.

Prediction of Nonuniform Inlet Temperature Effects on Vane and Rotor Heat Transfer

“…The analysis was done using the steady-state threedimensional Navier-Stokes code, RVC3D, described by Chima(1991), and by Chima and Yokota(1988). Comparisons with experimental heat transfer data for both vanes and rotors using this code have been reported, (Boyle and Giel(1995), Boyle and Jackson(1995), and Boyle and Lucci(1996)). The reported results were for cases in which the inlet flow field was uniform in the tangential direction for both vanes and rotors.…”

Predicted Turbine Heat Transfer for a Range of Test Conditions

“…Harasagama and Wedlake(1991), Chana(1992), and Arts and Heider(1994) presented stator vane heat transfer obtained in shock tube facilities for annular cascades. Predictions using three-dimensional Navier-Stokes analyses were obtained by Heider and Arts(1994) for the data of Arts and Heider(1994), and by Boyle and Jackson(1995) for the data of Chana(1994).…”

On the Application of Transition Correlations in Turbomachinery Flow Calculation

“…approach currently employed in turbomachinery practice is still the use of experiment-based correlations (Coupland, 1995) with different numerical schemes ranging from integral boundary-layer method to full Navier-Stokes analysis (Gostelow, et al, 1994, Slimani and Kulisa, 1997, and Boyle and Jackson, 1997.…”