Turbine Design: The Effect on Axial Flow Turbine Performance of Parameter Variation
A reference on both aircraft and industrial turbines, Turbine Design: The Effect on Axial Flow Turbine Performance of Parameter Variation details specific methods for optimization and design. A rotary machinery consultant and design engineer, the author examines how to investigate and fix the initial scantling selections, for input, to analysis, of CFD computer programs. He presents a method of selecting the best compromise turbine design, taking into account a range of parameters, including size, stress and number of stages. Used to design many turbines, FieldingAs method enables a designer to select the best compromise to ensure performance acceptability. The method uses correlations to investigate both the direct and the indirect problems.Contents Include: Basic Turbine Design Selection of Parameters Blade Efficiency and Shaft Efficiency Work Parameter and Flow Coefficient Degree of Reaction Minimum Hub/Tip Ration Minimum Exit Mach Number and Reynolds Number General Parameters Effect of Stress on Turbine Efficiency State Calculations Introduction Profile loss and Optimum Space/Chord Ratio Secondary and Leakage Loss Coefficients Three Dimensional Considerations State Thermodynamic Calculations Thermodynamics and Blade Shapes Relating Thermodynamic Calculations to Physical Blade Efflux Angle Prediction from a Blade Row Design Example Design and Test of a Single Stage Turbine Selection of Parameters Detailed Thermodynamic Design Comparison of Design Prediction and Test Results Index & References.
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BASIC TURBINE DESIGN
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50 percent reaction Ainley annulus area approximately aspect ratio assumed assumption axial blade chord blade length blade row blade shapes blade speed boundary layer Ca/U calculation cascade coefficient for S/C computational fluid dynamic constant correlation defined degree of reaction determined Diagram displacement thickness efflux angle energy thickness enthalpy drop entropy estimate Figure flow coefficient flow path fluid free vortex ft/sec GAS OUTLET ANGLE gas turbines given hub/tip ratio ideal gas ideal gas law inlet angle isentropic isentropic process kinetic energy KpAT leakage loss coefficients mass flow maximum mean section design method minimum Navier-Stokes equations nozzle OUTLET ANGLE DEGREES Pressure loss coefficient profile loss coefficient radius restriction factor Reynolds number root Mach number rotor secondary losses shroud simple radial equilibrium solution stator stress Substituting Eq temperature thermodynamic tion tip clearance total-to-total efficiency Uhub variation velocity viscosity zero exit swirl