前方后尖浮舱五边形后弯管水槽性能实验研究

EXPERIMENTAL STUDY ON PERFORMANCE OF PENTAGONAL BACKWARD BENT DUCT BUOY WITH BUOYANCY TANK SQUARE IN FRONT AND TRIANGULAR IN BACK IN 2D WAVE TANK

为提高后弯管(BBDB)波浪能的转换效率,对基于新理念和经验研制的前方后三角浮力舱五边形后弯管模型在造波水槽中进行一级能量转换实验研究。共考虑约束方式、喷嘴比、链长、吃水深度、模型浮态等因素,设置23种实验工况进行对比。实验中测量入射波高、波周期、气室液位和气室内外气压差。实验结果得到,该模型俘获宽度比最高值为121.34%,远优于同样实验条件下前方后圆后弯管模型79.1%的历史文献最高值;并且具有较宽的响应周期,为后弯管在随机波条件下实现高效转换创造条件;在BBDB模型正向波作用自由漂荡运动中,测得最大俘获宽度比为94.73%。模型实验结果与高效空气透平机组的结合,为波浪能的高效、低成本利用提供可能。

For improving the energy conversion efficiency of Backward Bent Duct Buoy(BBDB)wave energy utilization,a pentagonal BBDB model with the buoyancy tank square in front and triangular in back is developed based on the new ideas and the experiment experience and the BBDB is tested on the primary energy conversion in the wave flume(2D).23 test cases for five influence factors including the restraint way,the nozzle area ratio,the anchor chain length,the draft and the floating-state of model are carried out for comparison.The incident wave height,wave period,the elevation of internal water surface and the air pressure in the air chamber were measured in the tests.From the results,the maximum Capture Width Ratio(CWR)of the new model is 121.34%,which is far superior to the maximum CWR of the one with the buoyancy tank square in front and half cylinder in back 79.1%in the historical document under the same test condition.In addition,it has a wide responsive wave period,which creates the condition for a highefficiency conversion under the condition of irregular waves.When the BBDB is drifting freely along the direction of wave propagation,the maximum CWR is 94.73%.If the BBDB is combined with the high-efficiency air turbine and generator,it provides the possibility for efficient and low cost utilization of wave energy.