【作者】 王鑫； 陈瑜； 谢锡麟； 麻伟巍；

【Author】 WANG Xin;CHEN Yu;XIE Xi-lin;MA Wei-wei;Donghua University,Faculty of Science;Fudan University,Department of Mechanics & Engineering Science;

【机构】 东华大学理学院； 复旦大学力学与工程科学系；

【摘要】 通过自行设计的实验设备实现了控制槽道边界的运动,对流动边界的控制改变了槽道内流场中频率的构成。介绍了槽道流动装置,从不同角度:出口速度、边界变形频率和振幅研究和分析了边界静止槽道流动和控制边界运动的槽道流动,计算了实验工况下边界变形频率和流场中产生频率的斜率,对不同流场状态下的平均速度和湍流度进行了对比和FFT分析,比较得出了不同形态的槽道内流动特点。结果表明,槽道流动的边界变形能够控制槽道内流场中的频率,边界变形的频率与流场产生的基频频率之比的比例系数约为0.4945,亚谐频频率为基频频率的二分之一,且所有谐频与边界变形频率均成倍数关系,另外在同一流场剖面下倍频关系不会随速度和空间位置发生改变。而且平均速度和湍流度在不同边界变形方式和变形频率下呈现不同的增势。更多还原

【Abstract】 The deformation of the channel flow boundary is controlled by self-designed experimental equipment.The control of the boundary changes the frequency of the flow field in the channel.Channel flow device is introduced in this paper,the static and moving boundary of channel flow is researched and analyzed from different aspects:outlet velocity,frequency and amplitude of boundary’s deformation.This paper has calculated frequency of boundary’s deformation and flow field frequency of gradient under the experimental conditions,and different flow state of mean velocity and turbulent intensity is analyzed by comparison and FFT which concluded the characteristics of flow in different forms of channel.Results show that the deformation of channel boundary can control the flow field frequency,and the ratio of deformation of channel boundary and fundamental frequency is about 0.4945,subharmonic frequency is a half of the fundamental frequency,and all harmonic frequency and deformation of channel boundary are multiples,which is not change with the speed and the spatial position under the same flow profile.While the mean velocity and turbulence intensity showed different growth in different deformation mode and frequency of boundary.更多还原