Abstract
Polymer-ceramic pressure-sensitive paint (PC-PSP) has been investigated as a surface-pressure sensor for unsteady aerodynamics and short duration measurements. This PSP provides a fast response to a change in pressures with a spray-coating ability. Because it is sprayed onto an aerodynamic surface, the thickness of PC-PSP may play an important role in determining the performance of this sensor. The thickness of other fast PSPs, such as anodized aluminum pressure-sensitive paint, is a major factor in determining its performance. We vary the thickness of PC-PSP from 10 to 240 μm in order to study its effects on PSP measurement characteristics including time response, signal level, pressure sensitivity, and temperature dependency. It is found that the thickness does affect these characteristics. However, a thickness over 80 μm provides uniform performance in these characteristics.
Highlights
Pressure-sensitive paint (PSP) has been widely utilized in aerospace applications [1,2,3,4,5,6,7,8,9,10].In combination with a fast frame-rate camera, PSP measurement opens its application to unsteady flow measurement on surfaces and to short duration testing [11,12,13,14,15]
We focused on the influence of the thickness of polymer-ceramic pressure-sensitive paint (PC-PSP)
PC-PSP has been investigated for unsteady aerodynamics and short duration testing to this paper
Summary
Pressure-sensitive paint (PSP) has been widely utilized in aerospace applications [1,2,3,4,5,6,7,8,9,10].In combination with a fast frame-rate camera, PSP measurement opens its application to unsteady flow measurement on surfaces and to short duration testing [11,12,13,14,15]. PSP uses a photophysical process of oxygen quenching to relate an oxygen pressure of a testing fluid to a luminescent signal. A luminophore and a supporting matrix that is mixed solvent with a polymer and chemical solvent configure the PSP The former gives a luminescent signal and the latter holds the luminophore onto a test piece. Using a porous material as a supporting matrix enhances the response, as pores or other structures are open to a test gas (Figure 1b) This porous structure provides PSP with a fast response to a pressure change by enhancing mass diffusion in pores. This porous surface structure results in an enhanced time response of this PSP of approximately ten microseconds [18,19,20]. This porous PSP is constrained by the supporting matrix [21]
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