Basic operational parameters of a horizontal axis marine current turbine
Basic operational parameters of a horizontal axis marine current turbine
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发表时间：
2004-11
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通讯作者：
L. Myers;A. Bahaj
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作者：
L. Myers;A. Bahaj
对直径为0.4m的水平轴海流涡轮机（MCT）进行了循环水槽试验。该模型的设计目的是便于全变桨距叶片的变速运行，以模拟非设计点运行条件。在1.2ms-1至2.8ms- 1的流速范围内测量功率输出。采用轴向动量理论计算了旋翼的扭矩和推力。实验结果与Garrad哈桑& Partners Ltd.提供的名为Bladed的商用BEM计算机包的输出进行了比较。由于高叶片攻角的流行，使用了三个独立的翼型过失速方程来给出模型的不同水平的预测功率。水槽试验的结果表明，在高叶片攻角下，产生的功率超过了最乐观的预测值。在叶片角度接近失速前值时，测得的功率与预测值非常一致。观察到气穴现象，尽管动力传动系统振动明显，但似乎对功率产生影响不大。这项工作将有助于量化MCT的全面操作限制，从而优化这项新技术的性能。
A 0.4m diameter horizontal axis Marine Current Turbine (MCT) was tested in a circulating water channel. The model was designed to facilitate variable speed operation with full pitching blades to simulate off design point operational conditions. The power output was measured over a range of flow speeds from 1.2ms-1 to 2.8 ms- 1. Rotor torque and thrust were calculated using axial momentum theory. Experimental results were compared with the output of a commercial BEM computer package named Bladed supplied by Garrad Hassan & Partners Ltd. Due to the prevalence of high blade angles of attack three separate aerofoil post stall equations were used to give varying levels of predicted power for the model. Results from the water channel tests indicate that at high blade angles of attack the power generated was in excess of the most optimistic predicted values. At blade angles approaching pre-stall values measured power was in close agreement with predicted values. Cavitation was observed although appeared to have little effect upon power production although drivetrain vibration was noticeable. This work will facilitate full-scale operational limits to be quantified for MCTs thus optimising performance of this new technology.