Loading [a11y]/accessibility-menu.js
Signal Analysis of Supersonic Vapor Condensation in Nozzle Sensor Using Distributed Transient Pressure Probes | IEEE Journals & Magazine | IEEE Xplore

Signal Analysis of Supersonic Vapor Condensation in Nozzle Sensor Using Distributed Transient Pressure Probes


Abstract:

The amplitude-frequency characteristics of self-excited oscillating pressure in nozzle condensation dominate the actual flow field and mass flow rate, which affect the me...Show More

Abstract:

The amplitude-frequency characteristics of self-excited oscillating pressure in nozzle condensation dominate the actual flow field and mass flow rate, which affect the measurement accuracy of the sonic nozzle for the moist gas. In order to estimate this effect and improve the measurement accuracy, the complex supersonic vapor nozzle condensation with different nozzle geometries was investigated. First, the raw signals of the time-averaged and transient oscillating pressure during the condensation occurs in the nozzle were acquired, by using a multiparameter adjustable humidification apparatus, two nozzle sensors with distributed pressure probes and a 10th order low-pass hardware filter. Then, these raw signals were decomposed and reconstructed to further improve the filtering result, by using discrete wavelet transforms with the Db5 wavelet bases. Finally, the accurate amplitude-frequency characteristics of the transient pressure signals were extracted and analyzed by fast Fourier transform and the ratio correction method. It found that the experimental frequencies are mainly dependent on the curvature of nozzle wall and mass fraction of water vapor, which is also compared with a semiempirical formula derived from the experiments of 2-D symmetric rectangular nozzle. The results showed that this formula has a significant deviation from the experimental results of 3-D toroidal nozzles, which needs to be investigated further. All the research is contributed to further analyze the effect of condensation on the actual mass flow of the sonic nozzle.
Published in: IEEE Transactions on Instrumentation and Measurement ( Volume: 68, Issue: 4, April 2019)
Page(s): 1053 - 1061
Date of Publication: 19 August 2018

ISSN Information:

Funding Agency:


References

References is not available for this document.