Optimization design of the unsmooth bionic structure of a hydrofoil leading edge based on the Grey–Taguchi method

Abstract

Hydrofoil sections are broadly used in the field of fluid machinery. The leading edge of a hydrofoil structure is closely related to drag and cavitation performance. In this study, we adopt the concept of a bionic design. The fin structure of a fish is simplified and applied to the traditional National Advisory Committee for Aeronautics 0015 hydrofoil. We adopt the Grey–Taguchi method to calculate the best layout. This helps obtain the best drag and cavitation performance. Large eddy simulations are used to verify the scheme. When the ratio of fin depth to length h/L is 0.3, the fin layout length Xn is 7 L, the inclination of fins θ is 7°, and the bionic hydrofoil exhibits the best hydrodynamic performance. Application of the best bionic hydrofoil to the fluid machinery (pump) demonstrates that the hydraulic performance of the pump has been considerably improved.

Guest editorial for the special issue on “marine hydrodynamics for innovative design”

“…Advanced ocean engineering concepts including hydrofoils, 11,12 wave energy converters, 13 autonomous, 14 and remotely operated vehicles 15…”

“…Optimisation methods and algorithms, 3,12 physics informed models by swarm intelligence algorithms 16 Neural Networks 17 and Machine Learning methods 4…”

Investigation on Stall Characteristics of Centrifugal Pump with Guide Vanes

“…Therefore, the timing position affects the flow at the outlet of the volute so that the volute will produce a low-frequency fluctuation. In order to further study the clocking effect, the guide vane and volute tongue are simplified as two static hydrofoils [42]. The flow is controlled by the upstream valve angle for hydraulic characteristics research at different operating conditions.…”