Session: 39-01 Adjoint-based and adjoint-enhanced design optimization methods and applications

Paper Number: 80490

80490 - Multi-Objective Aerodynamic and Aeroelastic Coupled Design Optimization Using a Fully Turbulent Discrete Adjoint Harmonic Balance Method 

With increasing requirements for high-loading and high-efficiency turbomachines, the blades become thinner and thinner and thus the design optimizations considering both the aerodynamic performance and aero-elastic stability become more and more necessary. In this study, a fully turbulent discrete adjoint harmonic balance solver is developed using algorithmic differentiation (AD), validated by the finite difference method (FDM) with the nonlinear flow solver, and then adopted to perform multi-disciplinary coupled design optimization. To this end, a framework of multi-objective adjoint design optimization is constructed to improve both aerodynamic performance and aero-elastic stability of turbomachinery blades. This framework is divided into two steps including the aerodynamic design initialization and aero-elastic Pareto front determination. First, the blade profiles are optimized to improve the aerodynamic performance only and keep the aero-elastic stability constant. Second, the optimized blade profiles in the first step are used as the initial ones and then further optimized with the objective function of aero-elastic parameters and the constraints of aerodynamic parameters like the mass flow rate, total pressure ratio and the entropy generation. The effectiveness of the multi-objective design optimization method is demonstrated using the transonic NASA Rotor 67 subjecting to a hypothetical vibration mode. The results show that the multi-objective adjoint design optimization method can improve not only aerodynamic performance but also flutter stabilization.

Presenting Author: Hangkong Wu Northwestern Polytechnical University

Presenting Author Biography: I am a phd student studying at Northwestern Polytechnical University. I major in multi-disciplinary design optimization considering both the aerodynamic and aero-elastic stability of turbomachinery blades using discrete adjoint method.

Authors:

Hangkong Wu Northwestern Polytechnical University
Dingxi Wang Northwestern Polytechnical University
Xiuquan Huang Northwestern Polytechnical University