Much strong vortex was produced behind each elliptical tooth, which were distributed uniformly, so convective heat transfer was enhanced greatly. The tube side heat transfer film coefficient increased by two times in comparison with that without any insert. The enhancement was more than simple twisted strip by over 5 times.
由于平带上轴向等距离排布的椭圆齿齿后产生大量强烈的涡流，使管内的对流传热得以非常有效的强化，管内侧传热膜系数比空管时提高近一倍，其强化幅度达到光滑扭带的6倍以上。
And also, it shows that, in hydraulic turbine condition, there occurs the serious vortex strip vibration of draft tube with the frequency of 2.1 Hz, meanwhile, this frequency component exists in all the vibration signals of the unit.
水轮机工况，负荷为200MW时发生严重尾水管涡带振动，频率为2.1Hz，此时在机组各个振动信号中都有该频率成分存在。
A taut strip model of box girder is designed to test spanwise VIV response, and get the vortex induced force correlation effect function.
设计了箱梁断面拉条模型，通过测试沿跨向主梁涡激振动响应获得涡激力相关性效应函数。