Numerical Analysis of Turbulent Inflow Characteristics on Aerodynamic Loads of HAWT Rotor

HAWT转子气动载荷湍流流入特性数值分析

基本信息

批准号：
13650177
负责人：
HASEGAWA Yutaka
金额：
$ 2.24万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650177/
关键词：
Numerical Analysis Horizontal Axis Wind Turbine Inflow Condition Acceleration Potential Method Turbulent Flow Unsteady Flow Aerodynamic Characteristics Fatigue Load 翼型失速

项目摘要

This project is aimed at the development of numerical methods to simulate a turbulent wind field and to predict its influence on aerodynamic loads experienced by a HAWT rotor.The turbulent wind field simulation generates time series of turbulent wind speed at several points in a rotor plane for use in the aerodynamic loads analysis, taking account of the correlation of the wind time series at a certain point with that at every other point. The wind field simulation model is constructed on the basis of a Fourier synthesis method (the Veer's model). In this model, the required inputs are the power spectrum densities (PSDs) and the coherence functions of the turbulent wind, which define the cross spectral densities (CSDs) between any two points in the rotor plane. The vector of complex Fourier coefficients of the simulated wind can be determined by adding random phases to the set of PSDs and CSDs. By performing an inverse Fourier transform of the vector, the time series of the wind is obtained.For the calculation of aerodynamic loads on the rotor blades, an inviscid aerodynamic model based on an asymptotic acceleration potential method is adopted. This calculation model can easily evaluate the effects of the flow unsteadiness in the rotor plane induced by the wake. Unsteady aerodynamic loads caused by the dynamic stall effects are taken into account by using the ONERA method.It is analyzed how the aerodynamic loads on the rotor (ex.flapping moment) respond to turbulence characteristics of the wind incoming to the rotor. Turbulence characteristics of the wind incoming to a turbine rotor bring about complicated aerodynamic loads on the wind turbine, which must be considered in the structural design process of the rotor blades. The present calculation model has a possibility to develop a simple design tool.

该项目的目的是开发数值方法，以模拟动荡的风场并预测其对HAWT转子经历的空气动力负载的影响。动荡的风场模拟在转子平面中的多个点上的湍流速度产生了时间序列，用于在空气载荷分析中使用，并考虑到其他与其他点相关的空气载荷分析。风场仿真模型是基于傅立叶合成方法（VEER的模型）构建的。在此模型中，所需的输入是功率谱密度（PSD）和湍流风的相干函数，这些函数定义了转子平面中任何两个点之间的跨频谱密度（CSD）。模拟风的复杂傅立叶系数的向量可以通过在PSD和CSD的集合中添加随机相确定。通过执行向量的反傅立叶变换，可以获得风的时间序列。对于转子叶片上的空气动力载荷，采用了基于渐近加速度方法的无粘性空气动力学模型。该计算模型可以轻松地评估尾流诱导的转子平面中流动不稳定的影响。通过使用Onera方法考虑了由动态失速效应引起的不稳定的空气动力学负载。该方法分析了转子上的空气动力载荷（Ex.填充力矩）如何响应风接入转子的湍流特征。风向涡轮转子的湍流特征带来了风力涡轮机上复杂的空气动力载荷，这在转子叶片的结构设计过程中必须考虑。当前的计算模型有可能开发简单的设计工具。