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Control mechanisms of different bionic structures for hydrofoil cavitation.
Qi Yang1, Deyou Li1, Tinglan Xiao1
1School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.
Ultrasonics Sonochemistry
|January 1, 2024
Summary
A novel bionic structure combining humpback flipper and sailfish fin designs effectively controls hydrofoil cavitation. This combined approach significantly reduces cavitation volume and enhances flow stability in hydraulic machinery.
Area of Science:
- Fluid Dynamics
- Biomimetics
- Mechanical Engineering
Background:
- Cavitation poses a significant challenge to the efficiency and stability of rotating machinery.
- Existing bionic structures, like humpback flipper leading-edge protuberances and sailfish fin spine structures, offer limited cavitation control.
- There is a need for improved methods to mitigate hydrofoil cavitation in hydraulic systems.
Purpose of the Study:
- To develop and investigate a novel passive control method for hydrofoil cavitation by combining two existing bionic structures.
- To compare the cavitation control effectiveness of individual bionic structures with the combined structure.
- To analyze the underlying control mechanisms of these bionic designs on hydrofoil cavitation.
Main Methods:
- Large Eddy Simulation (LES) was employed to model and analyze cavitation processes.
- Three hydrofoil configurations were studied: wavy leading-edge, bionic fin spine structure, and a novel bionic combined structure.
- Cavitation was investigated under a specific cavitation number (σ = 0.8).
Main Results:
- The novel bionic combined hydrofoil demonstrated superior cavitation inhibition compared to individual structures.
- Cavitation volume was reduced by 43% with the combined bionic structure.
- Flow field stability was enhanced, with a reduction in the standard deviation of the pressure coefficient on the suction surface by up to 46.55%.
Conclusions:
- The combined bionic structure achieves a synergistic effect, enhancing cavitation control beyond individual designs.
- This novel approach offers a promising solution for improving the performance and longevity of hydraulic machinery.
- The findings provide valuable theoretical support for optimizing blade designs in applications like propellers and pump turbines.
Keywords:
Bionic structuresHydrofoil cavitationLarge eddy simulationPassive controlPressure fluctuationMore Related Videos
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