Abstract
Measurements of the global pressure field created by shock wave diffraction have been captured optically using a porous pressure-sensitive paint. The pressure field created by a diffracting shock wave shows large increases and decreases in pressure and can be reasonably accurately captured using CFD. The substrate, a thin-layer chromatography (TLC) plate, has been dipped in a luminophore solution. TLC plates are readily available and easy to prepare. Illumination comes from two high-intensity broadband Xenon arc light sources with short-pass filters. The sample is imaged at 100 kHz using a Vision Research Phantom V710 in conjunction with a pair of long and short pass filters, creating a band. The PSP results are compared with numerical simulations of the flow using the commercial CFD package Fluent as part of ANSYS 13 for two Mach numbers.
Highlights
A recent review on pressure-sensitive paint (PSP) technologies was conducted by Kontis [1] in which the scope and measurement range of PSP was highlighted
Unsteady pressure measurements have been carried out using pressure-sensitive paint (PSP) by several researchers [2,3,4,5,6,7,8,9]
The response is almost identical for both shock waves
Summary
A recent review on pressure-sensitive paint (PSP) technologies was conducted by Kontis [1] in which the scope and measurement range of PSP was highlighted. Unsteady pressure measurements have been carried out using pressure-sensitive paint (PSP) by several researchers [2,3,4,5,6,7,8,9] This is slightly misleading, as the term unsteady flow covers both repeating signals (such as those from a fluidic oscillator) and transients, such as a passing shock wave. Two of the papers mentioned, Asai et al [2] and Gongora-Orozco et al [8], measured the pressure distribution globally of a transient flow. Asai et al used a shock tube with a partially evacuated driven section and a pressurised driver section This sub-atmospheric starting pressure gives PSP a higher sensitivity, regardless of the substrate used [10]. The pressure at each location in the wave structure shown in Figure 1 can be analysed using the one-dimensional theory presented by Anderson [14]
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