Structure of turbulent flow in EMEC's tidal energy test site
Structure of turbulent flow in EMEC's tidal energy test site
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DOI：
10.1016/j.icheatmasstransfer.2009.02.010
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发表时间：
2009-05
影响因子：
7
通讯作者：
E. Osalusi;J. Side;R. Harris
中科院分区：
文献类型：
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作者：
E. Osalusi;J. Side;R. Harris
测量整体湍流参数（动能、耗散率、雷诺应力等）在欧洲海洋能源中心（EMEC）潮汐试验场使用声学多普勒海流剖面仪（ADCPs）的底部边界层。涨潮和落潮在海床附近超过1.4 ms−1（2.63 mab），并产生>7 Pa的应力。湍流动能（TKE）P的产生低于2×10− 9 Wm − 3时为负值，在洪水期间估计高达5×10− 4 Wm − 3，在滞水期间降低至10− 5 Wm − 3。采用结构函数法估算了TKE耗散率ε，最大洪水时海床附近的最大值可达5×10− 1 Wm − 3，而平水时的最大值可达4×10− 3 Wm − 3。通过使用bootstrap回归技术计算对应于ε的P个体比值，进行P和ε之间的比较。研究表明，整个涨潮和落潮期间的平均ε/P比值分别为~0.3553和~0.3266，表明产大于消。由于仪器噪声，雷诺应力估计的不确定性为4×10−4Pa。
Measurements of bulk turbulent parameters (Kinetic energy, dissipation rates, Reynolds stress, etc.) were performed in the bottom boundary layer of the European Marine Energy Centre (EMEC) tidal test site using Acoustic Doppler Current Profilers (ADCPs). Flood and ebb currents exceed 1.4 ms−1 near the seabed (at 2.63 mab) and generate >7 Pa stresses. The production of turbulent kinetic energy (TKE) P, was found to be negative below 2×10−9Wm−3and, of up to 5×10−4Wm−3was estimated during flood flows and decreasing to 10−5Wm−3during slack water. The TKE dissipation rate ε was estimated using the structure function method with greatest value of up to 5×10−1Wm−3near the seabed around maximum flood, falling to 4×10−3Wm−3around slack water. The comparison between P and ε was performed by calculating individual ratios of P corresponding to ε using a bootstrap resampling technique. The study shows that the ratio ε/P averaged over whole flood and ebb were found to be ~0.3553 and ~0.3266, respectively, indicating that production exceeds dissipation. The uncertainties in Reynolds stress estimates due to instrument noise was found to be 4×10−4Pa.