Ultrasonic Waves Peak-valley Fitting Method and Two-Dimensional Flow Velocity Measurement in Planar Cascade
QUE Yi-fei,YU Tian-yang,ZHANG Shi-wei,Ma Liang,SU Ming-xu
Institute of Particle and Two-phase Flow Measurement, Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
Abstract：In order to accurately obtain time difference information of ultrasonic propagation in complex two-dimensional flow fields, a signal processing method for determining echo characteristic points by polynomial fitting of ultrasonic peak and trough amplitude is investigated and applied to one-dimensional and two-dimensional flow velocity measurement. A measuring device of multi-channel ultrasonic velocity is developed. In the range of 0~40m/s flow rate, the device is used to acquire one-dimensional flow ultrasonic signal. The maximum relative error between the results obtained by the peak-valley fitting and those of the pitot tube is 0.72% lower than that calculated by the peak fitting method. A methodology for calculating two-dimensional flow velocity by means of time difference of diagonal transducers is proposed to conduct the measurement of two-dimensional flow velocity during a series of experiments in a planar cascade flow channel. The relative errors between the experimental flow velocities and those measured by the three-hole probe at different working conditions are all under 3.16%. It also effectively reflects the change trend of velocity at measuring points from magnitude to direction due to the change of channel section and blade bending at different inlet flow velocities.
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2023, Vol. 44 
