Abstract
A polymer-ceramic pressure-sensitive paint (PC-PSP) is a fast responding and sprayable PSP which has been applied for capturing global unsteady flows. The luminophore application process is studied to enhance the characterization of the PC-PSP. A dipping deposition method is used to apply a luminophore on a polymer-ceramic coating. The method selects a solvent by its polarity index. The characterization includes the signal level, pressure sensitivity, temperature dependency, and response time. It is found that the luminophore application process affects the steady-state characterizations, such as the signal level, pressure sensitivity, and temperature dependency. A range of change for each characterization, which is based on the minimum quantity, is a factor of 4.7, 9, and 3.8, respectively. A response time on the order of ten microseconds is shown. The application process is not a dominant factor for changing the response time, which is within the uncertainty of the thickness variation. Comparisons of the effects on the luminophore application process and the polymer content are made to discuss the PC-PSP characterization results.
Highlights
A luminescent pressure-sensitive paint (PSP) sensor combined with a fast frame-rate camera has been used for capturing global unsteady flows and for short duration testing [1,2,3]
Based on the present results obtained, we found that the luminophore application process effected more than the polymer content to control
A dipping deposition method was used to apply the luminophore onto a polymer-ceramic coating, which varied according to the polarity index of the solvents used for dipping
Summary
A luminescent pressure-sensitive paint (PSP) sensor combined with a fast frame-rate camera has been used for capturing global unsteady flows and for short duration testing [1,2,3]. The PSP uses a photophysical oxygen quenching process to relate an oxygen pressure of a testing fluid to a luminescent signal. It is composed of a luminophore and a supporting matrix. The supporting matrix of this PSP is composed of a porous particle and a polymer (Figure 1) The former enhances the response time, while the latter provides the spraying ability. Because a PC-PSP uses a porous material as one of the supporting matrix components, the application process would be a parameter to control the PSP characterization features, such as the signal level, pressure sensitivity, temperature dependency, and the response time. Comparisons were made to discuss the effects of the polymer content [10] and the application process on the PSP characterization results
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