Abstract
Temperature-sensitive paint (TSP) can optically measure a global temperature distribution using a thermal quenching of dye molecules. The TSP measurement is often used in wind tunnel tests to measure the temperature and flow fields in the aerodynamic field. The measurement accuracy is affected by the characteristics of TSP, such as temperature sensitivity, pressure dependency, luminescent intensity, photostability, and surface condition. The characteristics depend on the formulation of TSP. This study investigates the characteristics of the TSP using dichlorotris (1,10-phenanthroline) ruthenium(II) hydrate (Ru-phen). We compare the characteristics of TSPs using different polymers, solvents, and dye concentrations. The TSPs using polyacrylic acid as a polymer shows linear calibration curves, high luminescent intensity, high photostability, and smooth surface. On the other hand, the TSPs using polymethyl methacrylate have nonlinear calibration curves, low luminescent intensity, strong photodegradation, and a rough surface.
Highlights
Temperature is one of the most important physical quantities in fluid dynamics.Temperature-sensitive paint (TSP) is an optical measurement technology using thermal quenching of dye molecules
The luminescent intensity is measured in a non-contact method since TSP is an optical method that uses fluorescence and phosphorescence of dye molecules
The horizontal axis shows the temperature, and the vertical axis shows the luminescent intensity in the calibration curve
Summary
Temperature-sensitive paint (TSP) is an optical measurement technology using thermal quenching of dye molecules. It is often used in wind tunnel tests [1]. Non-contact measurement is one of the advantages of TSP Some probes such as a thermocouple or resistance thermometer are attached directly to test models. These attached probes can interfere with the flow field, and the presence of the probes would influence the measurement results in wind tunnel tests. The luminescent intensity is measured in a non-contact method since TSP is an optical method that uses fluorescence and phosphorescence of dye molecules. It is possible to measure two-dimensional and high spatial resolution temperature distribution using CMOS or CCD cameras
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