A parallel multiblock Navier-Stokes solver with the k‐ω turbulence model is used to solve the unsteady flow through an annular turbine cascade, the transonic Standard Test Case 4, Test 628. Computations are performed on a two- and three-dimensional model of the blade row with either the Euler or the Navier-Stokes flow models. Results are compared to the experimental measurements. Comparisons of the unsteady surface pressure and the aerodynamic damping are made between the three-dimensional, two-dimensional, inviscid, viscous simulations, and experimental data. Differences are found between the stability predictions by the two- and three-dimensional computations, and the Euler and Navier-Stokes computations due to three-dimensionality of the cascade model and the presence of a boundary layer separation, respectively.

Issue Section:
Technical Papers
Keywords:
turbines, blades, transonic flow, Navier-Stokes equations, boundary layer turbulence, flow instability, confined flow, aerodynamics, damping, flow simulation, flow separation
Topics:
Blades, Cascades (Fluid dynamics), Damping, Flow (Dynamics), Pressure, Simulation, Flutter (Aerodynamics), Turbine blades, Navier-Stokes equations, Shock (Mechanics), Suction, Separation (Technology)
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 by American Society of Mechanical Engineers
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