Adjoint-Based Unsteady Optimization of Turbomachinery Operating with Nonideal Compressible Flows

The lack of established optimal design guidelines for turbomachinery operating in the nonideal flow regime (e.g., organic Rankine cycle turbines, compressors, compressors refrigeration systems) demands effective and efficient automated methods. Past research work focused on gradient-free methods applied to computational fluid-dynamic simulations. application adjoint method is a cost-effective alternative as it enables gradient-based optimization irrespective number variables. This paper presents fully turbulent unsteady multirow partly regime. therefore allows solution constrained problems, which thermodynamic properties working fluid need be modeled by means complex equations state. designs computed with simulations obtained harmonic balance are then compared resulting from mixing-plane 1) two-dimensional turbine cascade subject time-varying inlet conditions, 2) stage an power system. results demonstrate importance computing using accurate models shape these machines.