Validation of the actuator line method for simulating flow through a horizontal axis tidal stream turbine by comparison with measurements
Validation of the actuator line method for simulating flow through a horizontal axis tidal stream turbine by comparison with measurements
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DOI：
10.1016/j.renene.2017.05.060
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发表时间：
2017-12
期刊：
影响因子：
8.7
通讯作者：
M. H. Baba-Ahmadi;P. Dong
中科院分区：
文献类型：
--
作者：
M. H. Baba-Ahmadi;P. Dong
本文的目的是评估执行器线法（ALM）模拟水平轴潮汐水轮机流动的能力。建立了一种结合ALM和大涡模拟技术的数值模型，并将其应用于实验室规模的潮汐水轮机的流场计算。从流向平均速度、湍流强度、湍流动能和涡轮后最大湍流动能衰减率等方面对流场进行了分析。结果表明，该方法能较好地预测涡轮后的平均流量和湍流特性。预测的流场显示了一个清晰的过渡，从涡轮附近的有组织涡度区到下游的高湍流。讨论了这种过渡的位置和控制参数，但需要进一步的数值和实验研究，以阐明其对潮汐能发电机组中下游涡轮机的流动结构和性能的影响。
The purpose of the present work is to evaluate the capability of the Actuator Line Method (ALM) to simulate flow through a horizontal axis tidal stream turbine. A numerical model combining the ALM with large eddy simulation technique is developed and applied to compute the flow past a laboratory-scale tidal stream turbine. The flow field is analysed in terms of streamwise mean velocity, turbulence intensity, turbulent kinetic energy and the decay rate of the maximum turbulent kinetic energy behind the turbine. It is found that the ALM performs well in predicting the mean flow and turbulence characteristics behind the turbine. The flow field predicted show a clear transition from an organised vorticity region near the turbine to a highly turbulent flow downstream. The location of this transition and the controlling parameters are discussed but further investigation, both numerical and experimental is required in order to clarify its effects on the flow structure and the performance of downstream turbines in tidal turbine arrays.