基于粒子运动分析的慢流速超声测量技术研究

Ultrasonic velocimetry based on particle displacement for slow flow

在河、港工模型试验中,水流慢流速的测量应用很多,但是慢流速的测量一直是有待解决的难点。本文提出了一种基于超声技术的流速测量方法,它是通过分析相邻两次测量中水中粒子的反射信号的位移求出颗粒的移动速度,从而实现流速测量。这种测量方法的特点是可测流速范围较大,尤其是在低流速段具有较高的灵敏度。初步实验结果表明,采用该方法最低可以测量0.5mm/s的流速。

Although there are lots of applications of slow velocity measurement in river and harbor model test, it is still a challenging job to measure slow velocity accurately. This article presents a new measurement method of flow velocity based on particle-displacement. The method calculates the velocity of flow from velocity of particles that is measured from the displacement of particle signals in two neighboring echoes. The advantage of this method is wide measurement range and more sensitive to slow velocity sphere. The primary experiments show that the lowest velocity can be measured is 0.5 mm/s with this method.