基于寿命法的压力敏感涂料静/动态特性实验

The pressure sensitive paint metrical technique has unique advantages in surface pressure measurements of internal and external flow fields. The study of spectral characteristics and "transducer" characteristics of paints is of vital significance for impact analysis of uncontrollable factors such as differences of surroundings in spraying and curing and applicability verification of specific tests for proposed paint formulas. Therefore, taking a phosphorescent pressure sensitive paint under research as the object, we conduct an experimental research on the variation law of luminescent lifetime with pressure and temperature based on a self-developed static calibration system. Fitting analysis of the measured results shows that the applicable temperature of the paint is between 30℃ and 60℃, which can be modified by temperature sensitivity. In addition, based on the self-developed high frequency dynamic pressure optical calibration system, the law of the pressure sensitive paint lifetime peak-to-peak values with different pressure pulsation frequencies is studied experimentally. Analysis ascertains that the cut-off frequency upper limit of the paint based on the luminescent lifetime is 0.94 kHz. The feasibility and effectiveness of the combination method for static and dynamic calibration of paint characteristics are further verified by experimental studies, providing important technical support for the research and development of pressure sensitive paint formulations and applications.