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| 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 |
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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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Received: 26 October 2022
Published: 18 May 2023
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2023, Vol. 44 
