Instantaneous Velocity Profile Measurement by Ultrasonic Doppler Method
Instantaneous Velocity Profile Measurement by Ultrasonic Doppler Method
复制标题
超声波多普勒法瞬时速度分布测量
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
Y. Takeda
中科院分区：
文献类型：
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作者：
Y. Takeda
PSI开发了超声速度剖面（UVP）测量方法。它利用脉冲超声回波描记术以及瞬时多普勒频移的检测。该方法与传统方法相比主要有以下优点：1）高效的流场映射过程，2）适用于不透明液体，3）时空速度场的记录。在简要介绍其工作原理的基础上，给出了该系统的特点和技术指标。然后以振荡管流、水银T型分支流和圆形自由射流为例，说明了上述优点。在流体动力学的进一步深入研究中，给出了旋转库埃特系统中调制波动流的研究结果。采用位置相关的功率谱和时间相关的能量谱密度研究了水流的动力学特性，并基于二维傅里叶分析将速度场分解为内禀波结构。
The Ultrasonic Velocity Profile (UVP) measuring method has been developed at PSI. It utilizes pulsed ultrasonic echography together with the detection of the instantaneous Doppler shift frequency. This method mainly has the following advantages over the conventional techniques : 1) an efficient flow mapping process, 2) applicability to opaque liquids and 3) a record of the spatiotemporal velocity field. After a brief introduction of its principle, the characteristics and specifications of the present system are given. Then examples such as for oscillating pipe flow, T-branching flow of mercury and circular free jet flow in fluid engineering are described, which confirm the above advantages. In a further in-depth study of fluid dynamics, results of an investigation of modulated wavy flows in a rotating Couette system are presented. The position-dependent power spectrum and time-dependent energy spectral density were used in order to study the dynamic characteristics of the flow, and subsequently the velocity field was decomposed into intrinsic wave structure based on the two-dimensional Fourier analysis.