A Nonlinear Computational Model of Tethered Underwater Kites for Power Generation
A Nonlinear Computational Model of Tethered Underwater Kites for Power Generation
复制标题
水下发电系留风筝的非线性计算模型
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
G. Tryggvason
中科院分区：
文献类型：
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作者：
Amirmahdi Ghasemi;D. Olinger;G. Tryggvason
通过数值模拟研究系留海底风筝 (TUSK) 的动态运动。 TUSK 系统由在洋流中移动的刚性翼状风筝组成。风筝通过系绳连接到海洋表面的平台或锚定到海底。风筝产生的水动力通过系绳传输到平台上的发电机以产生电力。 TUSK 系统被认为是船用涡轮机的替代品，因为风筝可以高速移动，从而与传统船用涡轮机相比提高了发电量。二维纳维-斯托克斯方程在规则结构网格上求解以求解洋流，并且虚拟域浸入边界法用于刚性风筝。采用投影方法和开放式多处理 (OpenMP) 来求解流动方程。调节两个系绳的放出和卷入速度以控制风筝的迎角和由此产生的水动力。详细检查了基线模拟，其中在连续的风筝功率和收回阶段实现了高净功率输出。然后进一步研究了TUSK系统中不同关键设计参数的影响，例如系绳与当前速度的比率、风筝重量、当前速度以及系绳与风筝弦长的比率。确定风筝的系统功率输出、涡流场、系绳张力和流体动力系数。功率输出结果与二维运动风筝的理论结果非常吻合。 [DOI：
The dynamic motion of tethered undersea kites (TUSK) is studied using numerical simu- lations. TUSK systems consist of a rigid winged-shaped kite moving in an ocean current. The kite is connected by tethers to a platform on the ocean surface or anchored to the seabed. Hydrodynamic forces generated by the kite are transmitted through the tethers to a generator on the platform to produce electricity. TUSK systems are being considered as an alternative to marine turbines since the kite can move at a high-speed, thereby increasing power production compared to conventional marine turbines. The two-dimensional Navier–Stokes equations are solved on a regular structured grid to resolve the ocean current flow, and a fictitious domain-immersed boundary method is used for the rigid kite. A projection method along with open multiprocessing (OpenMP) is employed to solve the flow equations. The reel-out and reel-in velocities of the two tethers are adjusted to control the kite angle of attack and the resultant hydrodynamic forces. A baseline simulation, where a high net power output was achieved during successive kite power and retraction phases, is examined in detail. The effects of different key design parameters in TUSK systems, such as the ratio of tether to current velocity, kite weight, current velocity, and the tether to kite chord length ratio, are then further studied. System power output, vorticity flow fields, tether tensions, and hydrodynamic coefficients for the kite are determined. The power output results are shown to be in good agreement with the established theoretical results for a kite moving in two dimensions. [DOI: