Abstract
Aiming at the performance evaluation problem of tidal energy turbines in the application of periodic time-varying flow velocity, with the goal of maximizing the efficiency of energy harvesting in practical applications, an evaluation system combining the characteristics of flow velocity changes in practical applications is proposed. After long-term monitoring of tidal current flow velocity in the applied sea area, the actual measured tidal current periodic flow velocity is divided into several flow velocity segments by using statistical segmentation, and the evaluation flow velocity of each flow velocity segment and its time proportion in the tidal current cycle are obtained. A test device with constant torque regulation is built, and capture power tests of different torque loads are carried out under each evaluation flow rate. After comparison, the maximum captured power at each evaluation flow rate is determined. We calculate the weight based on the time proportion of each evaluation flow velocity and obtain the turbine average power of the tidal cycle, thereby evaluating the overall energy capture performance of the turbine under the periodic time-varying flow velocity. Finally, the application test of the turbine in the actual sea area shows that the thin-walled airfoil turbine is more suitable for the sea area, which is the same as the pool evaluation result. The result shows that the evaluation system is reliable and effective and has significance for guiding practical engineering.
Highlights
The energy problem is urgent throughout the world today
TheThe fundamental reason for this this consequence is that flow rate actualapplication applicationsea seaarea areachanges changes periodically, periodically, so the consequence is that the the flow rate in in thetheactual the performance turbine at the flow rate cannot represent application performance ofofthethe turbine atdesign the design flow ratefully cannot fullythe represent theperformance application in the sea
In current research on tidal energy turbines, the problem of evaluating the energy capture performance of hydraulic turbines is focused on the design flow rate
Summary
The energy problem is urgent throughout the world today. The over-exploitation and utilization of fossil energy has caused a serious threat to modern civilization and the world economy [1]. Quan-kun Xu designed and built a 60 KW horizontal axis tidal current power generation system and carried out tests in the application sea area to evaluate its energy capture performance [17]. Evaluating the performance of the turbine at a specific flow rate to reflect the energy capture performance of the turbine in practical applications is one-sided. In order to more accurately reflect the comprehensive performance of hydraulic turbines under the application of time-varying flow velocity in the sea area, research on the turbine performance evaluation system based on the statistical segmentation of the time-varying flow velocity data of the applied sea tidal cycle was carried out, and a statistical segmentation of the time-varying flow velocity of the tide cycle was creatively proposed.
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