Abstract

As a renewable energy, wind energy has become the main direction of new energy research, so it is very important to study the coupling effect of wind and structure. In this paper, Fluent and Mechanical APDL are called through the Coupling System module to build a two-way fluidstructure coupling computing platform in ANSYS workbench. Study the characteristics of flexible plate flutter caused by two-way coupling, analyze the response of flexible plate structure under two-way coupling, analyze the impact of two-way coupling on the safety of flexible plate structure, and put forward flexible plate structure improvement strategies.

INTRODUCTION

With the continuous development of wind power generation technology, the generating power of wind turbines has increased from 500W at the beginning to ≥2MW at present, and the diameter of the wind wheel has also expanded from 3m to ≥100m at present. However, due to the large span, chord length and flexibility of the blade, it is more likely to be affected by aeroelastic problems caused by inertial force, elastic force and aerodynamic load in actual operation. In some serious cases, the blade may deform too much, causing fracture damage and bringing huge losses to the wind farm.

The analysis method considering fluid-structure coupling can accurately calculate the structure and fluid response of wind turbine under actual working conditions, which provides a reference for fine wind turbine blade design and is of great significance for the progress of wind turbine technology. Therefore, it is necessary to establish an accurate analysis method for fluid-structure interaction of blades, which is of great engineering significance for blade design and performance analysis.

In the fields of shipbuilding, new energy and aeronautical engineering, flexible plate and shell structures exist in large numbers, and the fluidstructure coupling vibration of such structures is a widespread problem. For the research of wind turbine blade, the precise simulation of flexible thin plate under the wind field is the basic research, and the wind turbine blade as a whole is similar to the flexible plate with high aspect ratio. In this work, using the commercial software ANSYS Fluent and Mechanical APDL to calculate the complex flexible plate. In the two-way coupling analysis, the deformation of the flexible plate at each time step is considered, which makes the solution more reliable. Figure 1 shows the computational flow of bidirectional fluid-structure coupling. The data is passed between the structure and the fluid in real time and only moves to the next time step when it converges simultaneously.

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