Experimental verification of the dynamic characteristics of the pulsation pressure measurement system

Introduction. Dynamic pressure is measured in many areas of human activity. It is often not possible to place a sensor directly at the pressure receiver point. Connecting tubes have to be used. This paper discusses the diagnostics of a measuring system for obtaining dynamic flow characteristics in a model of a hydraulic turbine spillway. The purpose of this study is to determine the optimal length of the pressure connecting line and to check the transfer characteristics of the measuring system used.

Materials and methods. A special stand was created for diagnostics of the measuring system. The software for signal processing is implemented in the LabVIEW graphical programming environment. The algorithm for converting sensor signals from the time domain to the frequency domain was the discrete Fourier transform (DFT). The measuring system used pressure sensors XGZP6857A. An analog-to-digital converter (ADC) NI USB 6225 was used. Calibration was performed using the standard method by conducting “reference” experiments in the AeroLab aerodynamic setup. The reference device is the differential digital pressure gauge ECO-INTECH DMC-01M.

Results. As a result of the experiments, pressure pulsation values were obtained for 6 different lengths of connecting tubes. The following lengths of connecting tubes were used in the experiments: 20, 40, 70, 150, 400, 900 mm. Pressure pulsations were recorded in the range from 0 to 70 Hz with a step of 10 Hz. During further analysis of the signals, pressure pulsation spectra and the dependence of the pressure pulsation amplitude on the length of the connecting tube were obtained.

Conclusions. The setup described in the paper can be used for dynamic calibration of pressure sensors in the frequency range up to 70 Hz with different lengths of connecting tubes. The measuring system discussed in the paper can be used to obtain dynamic characteristics of flow in the model of the hydraulic turbine spillway when copper connecting tubes up to 400 mm long are used.

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