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

Liu, Xu; Qin, Chen; Tang, Yuchao; Zhao, Kun; Wang, Peng; Liu, Yingzheng; He, Chuangxin

doi:10.1007/s00348-022-03419-4

Cited by 15 publications

(4 citation statements)

References 42 publications

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“…The PSD and root-mean-square (r.m.s.) were spectrally corrected to mitigate the spectral attenuation due to the paint response and the integral effect within a finite exposure time (Funderburk & Narayanaswamy 2019;Liu et al 2022a).…”

Section: Data Processing and Analysismentioning

confidence: 99%

Spanwise unsteadiness in the sidewall-confined shock-wave/boundary-layer interaction

Liu,

Chen,

Zhang

et al. 2024

J. Fluid Mech.

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Three-dimensional effects of sidewalls on the low-frequency unsteadiness of the shock-wave/boundary-layer interaction (SBLI) are of academic and practical importance but not yet well understood. Considerable attention has been paid to the viscous effect of sidewalls, whereas the potential inviscid confinement effect of sidewalls has received little attention. The present work provides experimental evidence of multiscale spanwise travelling waves crossing the separation front under the confinement of sidewalls. Global pressure measurements were made for a sidewall-confined 24 $^\circ$ compression ramp interaction in Mach-2.83 flow using fast-responding pressure-sensitive paint. The unsteady pressure in a statistically two-dimensional intermittent region suggests that in addition to the canonical streamwise oscillation, the separation front exhibits significant low-frequency, multiscale spanwise distortion. Modal analysis further reveals that multiscale spanwise unsteadiness has higher intensity and frequency than the streamwise oscillation. Such strong spanwise unsteadiness calls attention to the low-frequency unsteadiness in previous sidewall-confined SBLI experiments and encourages further study on the mechanism of the confinement effect.

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Section: Data Processing and Analysismentioning

confidence: 99%

Spanwise unsteadiness in the sidewall-confined shock-wave/boundary-layer interaction

Liu,

Chen,

Zhang

et al. 2024

J. Fluid Mech.

Self Cite

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“…Later work by Funderburk and Narayanaswamy [34] demonstrated a frequency correction algorithm based on the ratio of power spectral values from both PSP and transducers as a function of frequency; however, the authors noted that this method does not account for changes in phase as a function of frequency. Liu et al [35] and Numata et al [29] showed a correction for PSP frequency response by including both the influence of the camera exposure time and the physical frequency response of the PSP. The dynamic correction of PSP results for non-unity gain and phase lag across a wide range of frequencies is not often performed.…”

Section: Fast Response Pspmentioning

confidence: 99%

“…Correction of frequency response for non-unity gain is only applicable to stationary unsteady signals with long time history recordings. The study by Liu et al [35] demonstrated application of temporal response correction in the frequency domain and highlighted the challenges of overcorrection in the frequency domain (particularly at higher frequencies) resulting from relatively low signal to noise ratio. In order to correct for the low-pass filtering effect of the PSP response time, it is necessary to amplify high-frequency content; however, if frequency-domain information is the desired outcome of the experiment, care must be taken to not overcorrect highfrequency content [34,35].…”

Section: Fast Response Pspmentioning

confidence: 99%

Application of pressure-sensitive paint for explosive blast measurements

Quinn,

Nunn,

Adams

et al. 2023

Meas. Sci. Technol.

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This study demonstrates the application of fast response pressure-sensitive paint (PSP) to explosively driven blast wave testing. A sprayable polymer ceramic fast response PSP was applied to an aluminium disc before being coated with platinum porphyrin compound as the active luminophore. The disc was then exposed to a blast wave and the response was measured using a high-speed video camera. The PSP measured the transit of the incident shock wave clearly, albeit with a slight response delay following the instantaneous change in pressure. A time domain-based method for improving temporal response, whilst considering both spatial and temporal effects, is described. This study clearly demonstrates that the spatial distribution of a blast wave on a surface may be captured by PSP technology. Integrated parameters such as impulse can correctly be characterised using this method. This technology offers an enhanced and more efficient way of characterising blast.

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“…Furthermore, various PC-PSPs have been developed for unsteady-pressure measurement [15][16][17][18][19][20][21]. Fast-response PSPs have been applied to the unsteady-pressure measurement [10,22]. The mechanism of the time response of PSPs has also been studied [23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Indexes for evaluation of dynamic characteristics of pressure-sensitive paint based on pressure sensitivity and frequency response

Kasai,

Nagata,

Nonomura

2024

Meas. Sci. Technol.

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Two evaluation indexes were proposed to select the optimal PSP for unsteady pressure measurement from various PSPs with different pressure sensitivity and frequency response. An effective sensitivity coefficient calculated by pressure sensitivity and gain attenuation due to the response delay was proposed. Furthermore, an effective amount of intensity change was recommended, which takes into account the emission intensity and the effective sensitivity coefficient, because the magnitude of the intensity of a PSP is also important for unsteady-pressure measurement with high-speed sampling. A total of five types of PC-PSPs developed in previous studies were compared: two types of fast-response PC-PSPs using Pt(II) meso-tetra (pentafluorophenyl) porphine (PtTFPP) with poly(isobutyl methacrylate) (poly(IBM)) and ruthenium complex with RTV silicone, respectively, and three types of PC-PSPs using PtTFPP with poly[1-trimethylsilyl)-1-propyne] (poly(TMSP)). A comparison was made using the proposed evaluation indexes under various pressure ranges. The results showed that poly(TMSP)-based PC-PSP has a high effective sensitivity coefficient at pressures less than 20 kPa. On the other hand, poly(IBM)-based PC-PSP has the highest effective sensitivity coefficient at a pressure of 100 kPa. The effective amount of intensity change of poly(TMSP)-based PC-PSP is the highest at 2 kPa, but that of poly(IBM)-based PC-PSP is the highest at a pressure higher than 5 kPa among the evaluated PC-PSPs due to its high luminescence intensity.A PSP with high emission intensity will provide high performance in terms of fluctuation of emission intensity detected by the photodetector when the excitation intensity and the exposure time are limited due to limitations of optical equipment or high-speed sampling.

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

Cited by 15 publications

References 42 publications

Spanwise unsteadiness in the sidewall-confined shock-wave/boundary-layer interaction

Spanwise unsteadiness in the sidewall-confined shock-wave/boundary-layer interaction

Application of pressure-sensitive paint for explosive blast measurements

Indexes for evaluation of dynamic characteristics of pressure-sensitive paint based on pressure sensitivity and frequency response

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