This paper presents the application of a viscous continuous adjoint method for the optimization of a low-aspect-ratio turbine blade row through endwall contouring. A generalized wall-function method is implemented in a Navier-Stokes flow solver with Menter's shear-stress transport k-ω turbulence model to simulate the secondary flow with reduced requirements on grid density. Entropy production through the blade row combined with a flow turning constraint is used as the objective function in the optimization. With the viscous adjoint method, at each design cycle, the complete gradient information needed for optimization can be obtained by solving the flow governing equations and their corresponding adjoint equations only once for each cost function, regardless of the number of design parameters. Flow loss through the blade row is minimized while maintaining the same mass-averaged flow turning at the design condition. The performance of the optimized blade at off-design conditions is also evaluated and compared with that of the original blade.
Turbine Blade Row Optimization Through Endwall Contouring by an Adjoint Method
Journal of propulsion and power ; 31 , 2
2015
Aufsatz (Zeitschrift)
Englisch
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