Wavenumber-Frequency Spectra on a Launch Vehicle Model Measured via Unsteady Pressure-Sensitive Paint

Panda, Jayanta; Roozeboom, Nettie; Ross, James C.

doi:10.2514/1.j057449

Cited by 17 publications

(3 citation statements)

References 23 publications

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“…The surface pressure is then obtained by processing the emission intensity (in the intensity-based method) or luminescence lifetime (in the lifetime-based method). The PSP technique has been widely applied in wind tunnel studies [2][3][4] and other complex flow problems over the past two decades [5,6]. The rapid evolution of measurement techniques has enabled PSP to be applied to more challenging tasks [7] such as pressure measurement on fast-rotating surfaces.…”

Section: Introductionmentioning

confidence: 99%

A dual-camera single-shot lifetime method with fully controllable exposure gates for pressure-sensitive paint measurements on fast-rotating surfaces

Li¹,

Dong²,

Peng³

et al. 2022

Meas. Sci. Technol.

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This paper proposes a dual-camera single-shot lifetime method for pressure-sensitive paint (PSP) measurements on fast-rotating surfaces. Two cameras with fully controllable exposure gates are used for image acquisition to reduce the motion blur due to the open-ended exposure of the interline transfer charge-coupled device camera which was typically used for the single-shot lifetime method. The images can thus be processed without deblurring for a wider rotating speed range than is possible with existing techniques. More importantly, both frames have equal exposure times and therefore equal blur lengths. This enables precise pixel-to-pixel image matching and minimizes image registration errors. In addition, the signal strengths of the frames can be balanced, enabling shot-noise-induced errors to be reduced by independent adjustment of the aperture ratio. A pressure uncertainty estimation model is established to evaluate the measurement errors, which helps determine the system parameters. The dual-camera PSP system is calibrated and then validated through the surface pressure measurement of a fast-rotating disk. It is found that the exposure time te has little effect on the PSP sensitivity, whereas the delay time td affects both the pressure sensitivity and the measurement error. Both te and td are set to 5 μs in the rotating disk experiment. Images with a blur length of 1.4 pixels are captured and processed without deblurring to yield reasonable surface pressure results. The pressure error is decreased from 1.05 to 0.65 kPa by increasing the aperture ratio F from 2 to 4.

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Section: Introductionmentioning

confidence: 99%

A dual-camera single-shot lifetime method with fully controllable exposure gates for pressure-sensitive paint measurements on fast-rotating surfaces

Li¹,

Dong²,

Peng³

et al. 2022

Meas. Sci. Technol.

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“…Polymer-ceramic pressure-sensitive paint (PC-PSP) has received significant attention as a method for unsteady pressure measurement over aerodynamic test articles [1][2][3]. Spatial and temporal pressure measurements using PC-PSP have been utilized for the comprehension of advanced flow fields [4,5]. The luminescent intensity from PSP is related to the partial pressure of oxygen in the air based on a photophysical process called oxygen quenching.…”

Section: Introductionmentioning

confidence: 99%

Temperature Effects on Polymer-Ceramic Pressure-Sensitive Paint as a Luminescent Pressure Sensor

Hayashi

Sakaue

2020

Aerospace

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Polymer-ceramic pressure-sensitive paint (PC-PSP) has been used for capturing unsteady pressure over aerodynamic surfaces. Spatial and temporal pressure information is calculated from the luminescent intensity produced by a PC-PSP, which provides a nonintrusive pressure measurement. Despite its benefits, the temperature dependency of PC-PSP makes extraction of quantitative pressure data challenging. The temperature dependency in terms of the static and dynamic characteristics of a ruthenium-based PC-PSP is studied herein. The impact of temperature dependency on PC-PSP characteristics is also discussed in the context of an unsteady pressure measurement.

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“…Surface pressure fluctuations are commonly evaluated either in the spatial domain (Palumbo [9] and Haxter [1]) or in the wavenumber domain (Abraham [10], Haxter [11], Bull [12], and Panda [13]). Conclusions about the flow angle can be drawn from either of the two representations.…”

mentioning

confidence: 99%

Determining Flow Propagation Direction from In-Flight Array Surface Pressure Fluctuation Data

et al. 2022

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When characterizing spatial coherence properties of turbulent boundary-layer surface pressure fluctuation data, it is important to determine the local flow direction first. Without flow direction, it is very easy to introduce errors due to misalignment between sensors and the flow. For cases with two-dimensional microphone distributions, a method of determining flow direction from the orientation of the coherent pressure in spatial domain was introduced recently. If the data are analyzed in wavenumber domain, flow information can be obtained by the position and orientation of the convective ridge. In this publication, flow directions determined from a revised spatial domain approach and from two wavenumber domain approaches are considered. It was found that the result from the spatial domain approach and the result from the orientation of the convective ridge are similar for most frequencies, while the result based on the position of the convective ridge differs in the lower frequency range. Tilted convection of coherent structures in the turbulent boundary layer is discussed as a possible cause of these observations. A modification of the analytical model for surface pressure coherence is derived that takes the findings into account.

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Wavenumber-Frequency Spectra on a Launch Vehicle Model Measured via Unsteady Pressure-Sensitive Paint

Cited by 17 publications

References 23 publications

A dual-camera single-shot lifetime method with fully controllable exposure gates for pressure-sensitive paint measurements on fast-rotating surfaces

A dual-camera single-shot lifetime method with fully controllable exposure gates for pressure-sensitive paint measurements on fast-rotating surfaces

Temperature Effects on Polymer-Ceramic Pressure-Sensitive Paint as a Luminescent Pressure Sensor

Determining Flow Propagation Direction from In-Flight Array Surface Pressure Fluctuation Data

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