小型反馈射流振动器的动态特性研究

发布时间：2018-10-13 10:25

【摘要】：针对小型反馈射流振动器在低雷诺数下的流场的动态特性,利用粒子图形测速法(PIV)对其进行了二维测量实验,得到了不同流量下内部流场在振动稳定状态时的速度分布,流量范围为100~300 ml/min。通过实验监测上下反馈通道出口处的Y方向分速度并分析射流的振动过程和原理。数据分析方法包括快速傅里叶变换和小波变换,得到不同流量时的振动频率,进而得出振动频率特性和斯特罗哈数特性。结果表明:该小型反馈射流振动器内部流场呈周期振动,快速傅里叶变换和小波变换得到的振动频率接近,频率特性和斯特罗哈数特性均为非线性。
[Abstract]:In view of the dynamic characteristics of a small feedback jet vibrator at low Reynolds number, a two-dimensional measurement experiment is carried out by using the particle graph velocimetry method (PIV). The velocity distribution of the internal flow field under different flow rates is obtained when the flow is in a stable vibration state. Flow range is 100m 300 ml/min. The Y-direction velocity at the outlet of the upper and lower feedback channels is monitored experimentally and the vibration process and principle of the jet are analyzed. The data analysis methods include fast Fourier transform and wavelet transform to get the vibration frequency of different flow rate, and then to obtain the vibration frequency characteristic and the Stirohart number characteristic. The results show that the internal flow field of the small feedback jet vibrator is periodic vibration, the vibration frequency obtained by fast Fourier transform and wavelet transform is close, and the frequency characteristic and the Stirohart number characteristic are both nonlinear.
【作者单位】：武汉科技大学机械自动化学院;茨城大学工学部;
【基金】：国家自然科学基金项目(51475338) 湖北省自然科学基金项目(ZRZ2014000117)资助
【分类号】：O358

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