Multi-objective optimization design of the intake duct for a waterjet system

Asian Working Group- IAHR's Symposium on Hydraulic Machinery and Systems

Huang, R.F.^1,2 ; Dai, Y.X.^2 ; Zhai, Z.H.^2 ; Wang, Z.^1 ; Zhou, J.J.^2 ; Luo, X.W.^1

State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing

100084, China^1

Science and Technology on Water Jet Propulsion Laboratory, Shanghai

200011, China^2

关键词: Approximation function;    Design operations;    Hydraulic efficiency;    Ideal solutions;    Inverse design methods;    Non dominated sorting genetic algorithm ii (NSGA II);    Nonuniformity;    Waterjet systems;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/163/1/012074/pdf
DOI  :  10.1088/1755-1315/163/1/012074

来源: IOP

【 摘 要 】

An intake duct for a waterjet system is treated to improve the hydraulic efficiency and the outflow nonuniformity together with its perpendicularity. A multi-objective optimization strategy is proposed by incorporating with design of experiments (DOE), computational fluid dynamics (CFD), inverse design method, Kriging model and non-dominated sorting genetic algorithm-II (NSGA-II). Optimal Latin hyper-cube design method is used in DOE to uniformly sample in variation ranges, and global optimization is then conducted by using NSGA-II based on the input-target approximation functions approximated by the Kriging model. Instead of randomly selecting one solution to implement, a technique for ordering preferences by similarity to ideal solution (TOPSIS) is introduced to select the best compromise solution (BCS) from pareto-front sets. Compared with the original duct, the optimized intake duct has a much better outflow quality at the design operation point with a comparative hydraulic efficiency. Thus, the authors believe the proposed method is helpful for optimizing the intake duct.