| In recent years,ocean energy exploitation and utilization is becoming a popular research area all over the world.Wave energy,one of the most abundant ocean energy sources,has made huge progress in the last several years.Wave energy exploitation,for our country,can help to relieve the power shortage situation,improve living environment and promote exploitation of deep sea and distant offshore areas.Wave overtopping device on breakwater,a type of wave energy converter which combines breakwater with wave energy converter and their functions,has a promising foreground.This paper,choosing the Sliding-Plate-Breakwater-Type Wave Energy Converter as study object,with two methods of physical model experiment and numerical simulation,systematically studied the energy conversion and hydrodynamic performance of the device,and the main content is shown as follows:(1)The paper determined initial size of the device,designed experiment model,according to Froude similarity law,and then made experiment plan.(2)Overtopping experiment was conducted which studied the influence of water depth and the slope ratio on overtopping discharge.The results show that,under the same wave condition,when the slope ratio is the same,the deeper the water is,the more overtopping discharge there will be;when the water depth is the same,the overtopping discharge has a largest value if the slope ratio m is equal to 2.00.(3)Electricity generating experiments were conducted.Firstly,we conducted a current experiment to test the generators’ working performance.Then we analyzed the generating performance difference of the device with or without sliding plate.Results show that setting a sliding plate can obviously increase the generating efficiency,and the efficiency of the generator 2 ranges from 4.70% to 15.40% with sliding plate.Finally,we studied the influence of location of generator,circuit’s resistances,the water depth behind breakwater,and wave parameters on generator performance.The results are as follow.Location,the water depth behind breakwater,and wave parameters all have influences on generation;the influence of wave height is much more than other parameters.(4)A 3D numerical wave flume was built.The result,compared with overtopping experiment,shows that this method can effectively simulate wave overtopping,and that the overtopping discharge is close to the data gained from experiment.(5)The corresponding relation between the sliding plate’s top elevation and water depth,and the diameter of flow pipe was studied,using the numerical simulation method.Results show that sliding plate’s top elevation should be a bit higher over water depth.Comparison analysis of 5 pipe diameters between 50 mm to 200 mm and the better pipe diameter for energy capture is 100 mm.With two methods of physical model experiment and numerical simulation,the advantage of sliding plate was demonstrated;the key parameter of the Sliding-PlateBreakwater-Type Wave Energy Converter-slope ratio,the corresponding relation between the sliding plate’s top elevation and water depth,and diameter of flow pipe was ascertained;in the same time,the key parameters which influence generation was studied. |
