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首页> 外文期刊>Ocean Engineering >Tidal power extraction on a streamwise bed slope
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Tidal power extraction on a streamwise bed slope

机译：流床坡度上的潮汐能提取

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摘要

Three-dimensional Reynolds-averaged Navier-Stokes computations are presented for an actuator disc representation of an ideal tidal stream energy extracting device, operating within a channel that slopes in the streamwise direction. Downwards facing, horizontal and upwards facing slopes are considered at the same mass flow rate and depth at the device position, for both high and low channel blockage ratios. The downwards facing, slope is shown to present a greater available kinetic power to the disc than the horizontal and upwards facing slopes. This is due to the velocity profile being more strongly sheared as a result of the adverse pressure gradient, which results in greater thrust variation over the disc area. Conversely, during uphill flows devices experience reduced thrust variation, as the velocity profile is more uniform due to the favourable pressure gradient. Although downhill flows can deliver greater overall power due to increased flow shear, uphill flows are more efficient at converting the power presented to the disc into power removed and this is shown to be due to the downstream flow constriction and resulting increased pressure coefficient drop through the bypass flow. (C) 2016 Elsevier Ltd. All rights reserved.
机译：针对理想潮汐流能量提取装置的致动器盘表示，提供了雷诺平均的三维Navier-Stokes计算，该装置在沿流向倾斜的通道内运行。对于高通道阻塞率和低通道阻塞率，在设备位置的质量流量和深度相同时，应考虑朝下，水平和朝上的坡度。向下的斜面显示出比水平的和向上的斜面更大的动能。这是由于不利的压力梯度导致速度曲线受到更大的剪切，从而导致整个圆盘区域的推力变化更大。相反，在上坡流动期间，由于有利的压力梯度，速度曲线更加均匀，因此设备的推力变化减小。尽管由于流量剪切力的增加，下坡流可以提供更大的总功率，但上坡流将提供给圆盘的功率转换为已去除功率的效率更高，这表明这是由于下游流量的限制以及由此导致的压力系数下降所致。绕过流量。 （C）2016 Elsevier Ltd.保留所有权利。

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