Resolving dynamic features of kilohertz pressure fluctuations using fast-responding pressure-sensitive paint: measurement of inclined jet impingement

Fast-responding pressure-sensitive paint (fast PSP) is a valuable tool for high spatial and temporal resolution full-field pressure measurement. However, when fast PSP is used for quantitative measurement of pressure fluctuation, there remain challenges including signal attenuation and delay and noi...

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Bibliographic Details
Published in:Experiments in fluids 2022-04, Vol.63 (4), Article 72
Main Authors: Liu, Xu, Qin, Chen, Tang, Yuchao, Zhao, Kun, Wang, Peng, Liu, Yingzheng, He, Chuangxin, Peng, Di
Format: Article
Language:English
Subjects:
Attenuation
Contamination
Data analysis
Engineering
Engineering Fluid Dynamics
Engineering Thermodynamics
Feature extraction
Fluid- and Aerodynamics
Heat and Mass Transfer
Jet impingement
Mach number
Modal analysis
Noise
Noise reduction
Pressure measurement
Pressure-sensitive paints
Proper Orthogonal Decomposition
Research Article
Spatial resolution
Spectrum analysis
Temporal resolution
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Summary:Fast-responding pressure-sensitive paint (fast PSP) is a valuable tool for high spatial and temporal resolution full-field pressure measurement. However, when fast PSP is used for quantitative measurement of pressure fluctuation, there remain challenges including signal attenuation and delay and noise contamination. This paper first discusses the effect of PSP system’s response and noise contamination on pressure fluctuation measurement and data analysis (spectral analysis and dynamic modal analysis). Then, the ability of fast PSP to extract high-frequency dynamic features from an experimental system comprising an inclined subsonic jet impinging on a plate is characterized. In this system, the jet velocity was Mach number 0.78–0.84, the feature frequency of pressure fluctuation was as high as 2500 Hz, while the 3 dB attenuation of the PSP used in this work occurred at approximately 1300 Hz. Proper orthogonal decomposition is used to realize noise reduction with no loss in spatial resolution. This noise reduction and concomitant spectral correction substantially improve the accuracy of results up to a frequency of 2500 Hz. Spatiotemporal correlation, band-limited spectra, and spectral proper orthogonal decomposition (SPOD) are then used to analyze the pressure fluctuations due to jet impingement. The SPOD results reveal the kilohertz dynamic features caused by vortex motions on the plate. Graphical Abstract
ISSN:0723-4864
1432-1114
DOI:10.1007/s00348-022-03419-4