Investigation of transverse jet injections in a supersonic crossflow using fast-responding pressure-sensitive paint

Crafton, Jim; Forlines, Alan; Palluconi, Steve; Hsu, Kuang-Yu; Carter, Campbell; Gruber, Mark

doi:10.1007/s00348-014-1877-3

Cited by 31 publications

(11 citation statements)

References 13 publications

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“…A schematic and picture of the setup are shown in Figure 2. Polymer-ceramic/PtTFPPF PSP formulation, manufactured by ISSI Inc. and demonstrated to provide high, faster than 10 kHz, response [31], was applied on and around the turret; the paint has a pinkish color and can be seen in Figure 1, right. To illuminate PSP, eight UV light sources, emitting in a narrow band about 400 nm, were placed on both sides of the test section.…”

Section: Methodsmentioning

confidence: 99%

Conditional Studies of the Wake Dynamics of Hemispherical Turret Using PSP

Gordeyev

Lucca

Morrida

et al. 2018

2018 AIAA Aerospace Sciences Meeting

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Fast-response Pressure-Sensitive Paint (PSP) was used to study the wake response of the hemispherical turret at different subsonic and transonic Mach numbers to different pressure patterns on the hemisphere itself. POD technique was used to extract dominant spatial modes and the corresponding temporal coefficients of the unsteady pressure field on the hemisphere. The unsteady pressure distributions in the wake for different conditional events, such as large positive or negative temporal coefficients for different hemisphere-only POD modes, were computed and analyzed. It was found that the wake has the two main dynamic modes, the "switching" and "breathing" ones. The wake dynamics was found to be coupled with the instantaneous location of the separation line on the hemisphere. In the range of tested Mach numbers, the presence of the unsteady shock on the hemisphere did not have any significant effect of the wake dynamics.

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Section: Methodsmentioning

confidence: 99%

Conditional Studies of the Wake Dynamics of Hemispherical Turret Using PSP

Gordeyev

Lucca

Morrida

et al. 2018

2018 AIAA Aerospace Sciences Meeting

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“…The resulting system acts as an array of fast pressure transducers and the resulting data can be analyzed to provide frequency content of the flow at each spatial location. Dynamic PSP systems have been used to identify structures in cavity flows 6 , study shock boundary layer interactions 7 , and investigate transverse jet injection in supersonic flows 8 .…”

Section: Experimental Approachmentioning

confidence: 99%

Investigation of Passive Flow Control of Cavity Acoustics Using Dynamic Pressure-Sensitive Paint

Crafton

Stanfield

Rogoshchenkov

et al. 2017

55th AIAA Aerospace Sciences Meeting

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Spatially resolved pressure fluctuations were measured on the ceiling of a rectangular cavity using pressure-sensitive paint for the frequency range of 100 to 5000 Hz. The measurements were acquired at Mach 0.7 and 1.5 for a clean cavity, and with four different flow control devices placed at the leading edge of the cavity. The high spatial resolution of the PSP data allowed the pressure waves to be visualized as they moved down the cavity. Timeresolved pressure data was analyzed to reveal frequency spectrum, identify Rossiter tones, and compute sound pressure levels in the cavity. The frequency and amplitude of the PSP data were in good agreement with conventional dynamic pressure sensors that were located along the length of the cavity centerline. Comparisons of the PSP spectral data with the pressure transducer spectral data indicate a noise floor for the PSP data of about 105-dB for the supersonic data. The high spatial resolution spectral maps indicated asymmetric structure in the higher order Rossiter tones with several of the flow control devices. Analysis of the data using Proper Orthogonal Decomposition revealed that the asymmetric structure was present, but very weak, in the baseline case. This suggests that the flow control devices were not creating the asymmetry, but enhancing an already present structure. This asymmetry was not evident in the subsonic data. I.Nomenclature CMOS= complementary metal-oxide semiconductor LED = light emitting diode POD = proper-orthogonal decomposition PSP = pressure-sensitive paint SPL = sound pressure level

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“…A typical PSP is composed of an oxygen sensitive luminescent probe in an oxygen permeable binder (Crafton, Forlines, Palluconi, Hsu, Carter, & Gruber, 2011). The surface is then illuminated by and LED light source of a prescribed wavelength.…”

Section: Pressure Sensitive Paintmentioning

confidence: 99%

A Study on the Aeroelastic and Aeroacoustic Effects of a Sonic Under-expanded Jet

Palluconi

Crafton

Dong

2013

43rd Fluid Dynamics Conference

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An experimental and computational study of a sonic and sub-sonic jet impinging on a flat plate is presented. Traditional techniques for acquiring surface pressure distributions on models call for embedded arrays of pressure taps and or transducers which can be costly and are limited in spatial resolution and by model geometry. Pressure sensitive paint (PSP) offers a costeffective non-intrusive alternative with superior spatial resolution over traditional techniques. Experimental pressure sensitive paint measurements are compared to CFD models using the Spalart-Allmaras single equation turbulence model. Attempts are made and conclusions are presented to correlate flow structures to noise sources such as screech tones. Jet noise has been characterized but its sources are not fully understood and this research aims to look experimentally at its origins.Introduction: Pressure Sensitive Paint (PSP) is an optical sensor used for surface pressure measurements. A paint-like coating is applied to a surface and illuminated by an LED lamp of a specific wavelength. The fluorescence of the paint is then imaged through a long-pass filter by a CCD camera and stored for conversion to pressure by use of a previously determined calibration. The paint fluorescence is a function of the local oxygen concentration in the air. Using PSP, each camera pixel acts as a pressure transducer. PSP was used to investigate the steady pressure distribution across the surface of an acrylic plate statically mounted normal to a sonic jet impinging on its surface. The study was done over a wide range of impingement distances and pressure ratios using to determine cases of interest where distinct tones were produced. A case of interest was modeled using CFD in FLUENT © for comparison with the PSP data.

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Investigation of transverse jet injections in a supersonic crossflow using fast-responding pressure-sensitive paint

Cited by 31 publications

References 13 publications

Conditional Studies of the Wake Dynamics of Hemispherical Turret Using PSP

Conditional Studies of the Wake Dynamics of Hemispherical Turret Using PSP

Investigation of Passive Flow Control of Cavity Acoustics Using Dynamic Pressure-Sensitive Paint

A Study on the Aeroelastic and Aeroacoustic Effects of a Sonic Under-expanded Jet

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