NREL airfoil families for HAWTs
NREL airfoil families for HAWTs
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DOI：
10.2172/10106095
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
J. Tangler;D. Somers
中科院分区：
文献类型：
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作者：
J. Tangler;D. Somers
水平轴风力涡轮机（HAWT）专用翼型的开发始于1984年，是国家可再生能源实验室（NREL）（前身为太阳能研究所（SERI））和翼型公司的共同努力。从那时起，七个翼型家族已被设计用于各种尺寸的转子使用埃普勒翼型设计和分析代码。新翼型族的一般性能要求是它们具有对粗糙度影响相对不敏感的最大升力系数（c{sub l，max}）。翼型系列满足失速调节、变桨距和变转速风力涡轮机的需求。对于失速调节旋翼，通过设计抑制最大升力系数的叶尖翼型实现了更好的峰值功率控制。对于给定的发电机尺寸，受约束的最大升力系数允许使用更大的扫掠盘面积。此外，对于失速调节转子，使用具有高厚度的叶尖翼型来容纳失速控制装置。对于变桨距和变转速转子，具有高的最大升力系数的尖端翼型适合于具有低实度的轻质叶片。对于具有全翼展桨距控制的叶片，具有低厚度的尖端翼型导致较小的阻力。NREL翼型系列的年能量改进预计为失速调节涡轮机的23%至35%，变桨距涡轮机的8%至20%，变转速涡轮机的8%至10%。对失速调节水轮机的改进已在现场试验中得到验证。«少
The development of special-purpose airfoils for horizontal-axis wind turbines (HAWTs) began in 1984 as a joint effort between the National Renewable Energy Laboratory (NREL), formerly the Solar Energy Research Institute (SERI), and Airfoils, Incorporated. Since that time seven airfoil families have been designed for various size rotors using the Eppler Airfoil Design and Analysis Code. A general performance requirement of the new airfoil families is that they exhibit a maximum lift coefficient (c{sub l,max}) which is relatively insensitive to roughness effects. The airfoil families address the needs of stall-regulated, variable-pitch, and variable-rpm wind turbines. For stall-regulated rotors, better peak-power control is achieved through the design of tip airfoils that restrain the maximum lift coefficient. Restrained maximum lift coefficient allows the use of more swept disc area for a given generator size. Also, for stall-regulated rotors, tip airfoils with high thickness are used to accommodate overspeed control devices. For variable-pitch and variable-rpm rotors, tip airfoils having a high maximum lift coefficient lend themselves to lightweight blades with low solidity. Tip airfoils having low thickness result in less drag for blades having full-span pitch control. Annual energy improvements from the NREL airfoil families are projected to be 23% to 35% for stall-regulatedmore » turbines, 8% to 20% for variable-pitch turbines, and 8% to 10% for variable-rpm turbines. The improvement for stall-regulated turbines has been verified in field tests.« less