基于Fluent的潮流能提取水动力影响数值研究

Numerical Study on Hydro-Dynamic Impact of Tidal Current Energy Extraction Based on Software of Fluent

利用CFD软件建立三维数值水槽水动力模型,并对三种推力系数下放入潮流能发电机后水流流场的变化进行模拟计算分析,以推力系数取0.75为例,从水位和流速变化的角度分析和讨论潮流能提取对水动力的影响,并对三种推力系数下的流速减小进行对比分析。计算结果表明:发电机阻碍了水流的运动,发电机附近流速明显下降,同时发电机下游产生明显的尾流效应,发电机周边及尾流外流速明显加快;推力系数越大,流速变化值越大,同时流速恢复得越慢。

A 3-dimension numerical channel was established by using the commercial computational dynamics （CFD） code FLUENT. The tidal current fields with three different power extraction schemes were simulated. Taking drag coefficient of 0.75 as an example, the hydro-dynamic impact of tidal current energy extraction were analyzed in the ease of water level and current velocity. Then, the velocity deficits of the three eases were compared with each other. The simulated results illustrate that there is a clear velocity reduction due to energy losses in the wake. However, the water speed is accelerated around the turbine and also along the downstream wake. It is also found that the bigger the drag coefficient is, the larger the value of velocity deficit Cr is, and also the slower the water velocity recovers.