Endwall contouring, optimization, adjoint

What is it about?

The work attends to reduce the secondary flow loss of a low-aspect-ratio, subsonic turbine blade by using the adjoint method. A general wall function treatment is briefly introduced and applied to improve the computation resources. Through endwall profiles redesign, not only the total pressure ratio, adiabatic efficiency but also the secondary kinematic energy can be improved.

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Why is it important?

Firstly we applied the wall function method to the simulations of secondary flow and grid-independent solutions are obtained, by which the resolution of the grid can be significantly reduced and thus improve the optimization efficiency. Secondly we present another optimization case by using the viscous adjoint method, which was actually completed several years before.