Feature Extraction of Oscillating Flow with Vapor Condensation of Moist Air in a Sonic Nozzle

Ding, Hongbing; Li, Yiming; Wang, Chao; Wen, Chuang; Tian, Yuhe

Abstract

The sonic nozzle is commonly used in flow measurement. However, the non-equilibrium condensation phenomenon of moist air in the nozzle has a negative effect on the measuring accuracy. To investigate this complex phenomenon, the experiments on the oscillating condensation flow of moist air were conducted by an adjustable humidification apparatus with different relative humidity (0-100%), temperature (30-50° C) and carrier gas pressure (1-6 bar), where the micro size pressure measuring system was designed by Bergh-Tijdeman (B-T) Model. The accurate mathematical model of nonequilibrium condensation was also built and validated by the experimental data of time-averaged pressure distribution. Then, the frequency and intensity of pressure fluctuation of oscillating flow at a wide range of operation condition were obtained combining experimental data and physical simulation model. Importantly, a new semi-empirical relation of dimensionless frequency deduced from dimensionless analysis was identified accurately by experimental data. Finally, the signal nonstationarity was also observed by using the continuous wavelet transform (CWT). The instantaneous frequency saltation and the energy attenuation of pressure signals were observed in the condensation flow.

Citation

Ding, H., Li, Y., Wang, C., Wen, C., & Tian, Y. (2020). Feature Extraction of Oscillating Flow with Vapor Condensation of Moist Air in a Sonic Nozzle. IEEE Transactions on Instrumentation and Measurement, 69(9), 1-1. https://doi.org/10.1109/tim.2020.2967130

• Journal Article Type: Article
• Acceptance Date: Dec 30, 2019
• Online Publication Date: Jan 20, 2020
• Publication Date: Jan 20, 2020
• Deposit Date: Feb 24, 2020
• Publicly Available Date: Feb 24, 2020
• Journal: IEEE Transactions on Instrumentation and Measurement
• Print ISSN: 0018-9456
• Electronic ISSN: 1557-9662
• Publisher: Institute of Electrical and Electronics Engineers
• Peer Reviewed: Peer Reviewed
• Volume: 69
• Issue: 9
• Pages: 1-1
• DOI: https://doi.org/10.1109/tim.2020.2967130
• Keywords: Sonic nozzle; vapor condensation; oscillating frequency and intensity; semi-empirical relation; CWT; nonstationary
• Public URL: https://nottingham-repository.worktribe.com/output/4027305
• Publisher URL: https://ieeexplore.ieee.org/abstract/document/8963904
• Additional Information: © 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.