Abstract
In order to study the vortex-induced vibration response and lock-in characteristics of NACA 0009 hydrofoil under the inlet velocity changing linearly and continuously, a measurement experiment was arranged based on a vortex-induced vibration synchronous measurement experiment platform. Adopting a feedback control method for incoming flow velocity, the small deformation of hydrofoil trailing edge displacement and wake structures were accurately measured, discovering a series of new lock-in phenomena innovatively. The experiment results show that an “amplitude jump” can occur on the hydrofoil when entering and exiting the lock-in regime, increasing hundredfold of the structural vibration amplitude. There is a “frequency increase” phenomenon in the lock-in regime due to the structural natural frequency increasing slowly with the inlet speed. Analyzing the interaction among of vortex evolution, displacement and vibration velocity in the lock-in regime, the experimental study can provide more bases for the lock-in mechanism and fluid-structure interaction characteristics of the hydrofoil.
| Translated title of the contribution | Experimental Study on Lock-in Characteristics of NACA0009 Hydrofoil |
|---|---|
| Original language | Chinese (Traditional) |
| Pages (from-to) | 287-294 |
| Number of pages | 8 |
| Journal | Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of Technology |
| Volume | 45 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - Mar 2025 |