潮流發(fā)電試驗場水動力特性數(shù)學模型研究
[Abstract]:Energy crisis and environmental pollution are two major problems facing the world today. As a green and clean renewable energy, tidal current has great advantages such as abundant reserves, predictability and environmental and ecological friendliness, so the prospect of development is very considerable. Many countries rich in marine resources have formulated corresponding policies and strategic objectives in order to vigorously promote the research of tidal current energy generation technology and successfully build a certain scale of tidal energy generation test ground. In order to understand the influence of the installation on the flow field and arrange the berth of the generator set in the test site reasonably, this paper takes the Putuo Shan-Huludao tidal current energy demonstration project in Zhoushan as the research site. The mathematical model is used to simulate the influence of the generator on the local near-field and large-range far-field hydrodynamic forces in the test area. In this paper, the research methods and conclusions of hydrodynamics in tidal current energy test site are briefly introduced from the point of view of numerical simulation, and a generalizing method of generating equipment based on energy equation is put forward. That is to say, the influence of the device for quantifying the resistance loss along the flow field between the upper and lower reaches of the flow field is adopted, and the effect is transformed into the corresponding bottom bed resistance, and the equivalent roughness coefficient of the power flow generator is derived. Then the local flow field model of the three-dimensional tidal current energy device is established and the velocity distribution of the local flow field is simulated and analyzed with CFD software under the combination of seven rotational speeds and velocities. According to the generalizing method of the generator, the equivalent roughness and the comprehensive roughness of each unit are calculated, and the functional relationship between the flow velocity and the comprehensive roughness is obtained by regression analysis. Finally, this function is introduced into the two-dimensional tidal current mathematical model of Putuo Mountain Island-Huludao Island in Zhoushan, and the influence of the device is simulated by modifying the roughness value of the grid in which the device is located. In the calculation of the two-dimensional model, the response degree and range of hydrodynamic force in the whole test site are studied when the whole device is placed in a fluctuating tide calendar, when a single device is placed in the spring tide process, and the whole device is placed in the whole tidal process. The results show that the influence area of the device on the flow field is related to the tidal current velocity and the topography near the device berth. The farther away from the device, the less the influence of the device on the flow field is. On the whole, the influence of the device on the far-field velocity is small, the change of the velocity is at least about 2%, and the maximum is not more than 8% of the velocity before the device is placed.
【學位授予單位】:天津大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:TM612
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