Study on Unsteady Aero-dynamic Load Analysis of Horizontal Axis Wind Turbine Rotor

水平轴风力发电机转子非定常气动载荷分析研究

基本信息

批准号：
15560136
负责人：
HASEGAWA Yutaka
金额：
$ 2.37万
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：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

Complex terrain has become attractive as the site proposed for WTGS(Wind Turbine Generator System). The turbulent intensity of the wind flow over the complex terrain is, however, much larger than that over flat terrain, and it brings about increased aerodynamic load on the wind turbine blades. Therefore it is important for the design of WTGS and wind turbine blades to estimate and/or to measure the turbulent characteristics of the wind over complex terrain correctly. It is also necessary to examine the effects of the unsteady flow conditions on the blade load fluctuation by means of a numerical calculation. In the present research, the following three projects have been performed.A local angle of attack to HAWT rotor blade has been analyzed in the unsteady flow conditions, by means of numerical calculation based on the panel method. Yawed inflow condition was adopted for the calculation, and the spanwise distribution of the angle of attack (A.O.A.) is found to fluctuate in sinusoidal m … More anner when the yaw misalignment angle is small as much as 5〜15 deg. When the misalignment angle is increased to 30 degree, the fluctuation of A.O.A.shows high frequency component because of the dynamic stall effects.The detailed wind measurements using multi wind-masts were also carried out at Shitara-Cho, Aichi in Japan during the period from November 19th in 2003 to March 23rd in 2004. The influence of the terrain slope on the wind has been examined by analyzing the vertical profile of mean velocity and the characteristics of the turbulence, such as the power spectrum and the coherence.The existence of tower in horizontal axis wind turbine system has a large effect on surrounding fluid flow. In case of upwind wind turbines, the unsteady aerodynamic loads occur when the blades of a wind turbine are passing in front of the tower. The present research has also tried to produce a numerical method for calculating the effect of tower existence on the aerodynamic loads. For the calculation of aerodynamic loads on the rotor blades, an inviscid aerodynamic model based on the asymptotic acceleration potential method was adopted, which is capable of calculating the unsteady aerodynamic loads. In the model, the rotor blades are represented by spanwise and chordwise pressure distributions. The tower is represented by pressure distribution, in order to adapt the numerical model to that for the calculation of aerodynamic loads on the blades. Less

复杂地形随着WTGS（风力发电机组）选址而变得有吸引力，但复杂地形上的风流湍流强度比平坦地形上的风流湍流强度大得多，并且会带来更大的气动载荷。因此，对于 WTGS 和风力涡轮机叶片的设计来说，正确估计和/或测量复杂地形上的风的湍流特性非常重要，还需要检查非定常流的影响。通过数值计算研究了叶片载荷波动的条件。在本研究中，进行了以下三个项目。通过基于数值计算的方法，对非定常流动条件下的HAWT转子叶片的局部攻角进行了分析。采用面板法进行偏航流入条件计算，发现当偏航失准角较小时，攻角（A.O.A.）沿翼展呈正弦波动。高达5〜15°当失速角增加到30°时，由于动态失速效应，A.O.A.的波动表现出高频成分。在Shitara-Cho也进行了使用多风桅的详细风测量， 2003年11月19日至2004年3月23日期间的日本爱知县，通过分析日本爱知县的垂直剖面，研究了地形坡度对风的影响。水平轴风力机系统中塔架的存在对周围流体流动有很大的影响。对于逆风风力机，当风力机出现不稳定气动载荷时，会产生不稳定的气动载荷。目前的研究还尝试提出一种计算塔架存在对空气动力载荷影响的数值方法，以计算转子叶片上的空气动力载荷。采用基于渐近加速度势法的无粘气动模型，能够计算非定常气动载荷。模型中，转子叶片用翼展方向和弦向压力分布表示，塔架用压力分布表示。将数值模型应用于计算叶片上的空气动力载荷。

项目成果

期刊论文数量（23）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Study on Unsteady Flow around a HAWT Rotor by Panel Method(Calculation of Yawed Inflow Effects and Evaluation of Angle of Attack in Three Dimensional Flow Field)

HAWT转子周围非定常流的面板法研究（偏航流入效应计算和三维流场攻角评估）

DOI：
发表时间：
2005
期刊：
Transactions of the Japan Soc.of Mechanical Engineers(in Japanese) Vol.71-B. No.701
影响因子：
0
作者：
H.Imamura;D.Takezaki;Y.Hasegawa;M.Kawai;K.Kikuyama
通讯作者：
K.Kikuyama

Aerodynamic Loads Calculation of a Horizontal Axis Wind Turbine Rotor in Combined Inflow Condition

复合流入工况下水平轴风力发电机转子气动载荷计算

DOI：
发表时间：
2004
期刊：
Proceeding of 2004 European Wind Energy Conference and Exhibition (2004-11, London, U.K.) (On CD-Rom)
影响因子：
0
作者：
Y.Hasegawa;H.Imamura;他3名
通讯作者：
他3名

Fundamental Study for Estimation of Wind Energy Resources(2^<nd> Report, Turbulence Characteristics of Wind Flow over Complex Terrain)

风能资源估算的基础研究（第2^<nd>报告，复杂地形风流湍流特性）

DOI：
发表时间：
2005
期刊：
Transactions of the Japan Soc.of Mechanical Engineers(in Japanese) Vol.71-B(in Press)
影响因子：
0
作者：
Y.Hasegawa;K.Kikuyama;H.Imamura;H.Suzuki;H.Ishikawa;K.Hatabara
通讯作者：
K.Hatabara

パネル法による水平軸風車ロータ周りの非定常流れ解析,(斜め流入風の影響と三次元流れ場における迎角の考察)

采用面板法进行水平轴风力机转子绕流非定常分析（考虑斜入风和三维流场攻角的影响）