Fabrication And Characterization Of Fast-responding Pressure-sensitive Paint Based On Mesoporous Particle

Pressure-sensitive Paint measurement technology is a non-contact optical pressure measurement method based on fluorescence"oxygen quenching"process in photoluminescence.Because of its remarkable advantages of high spatial resolution and full-field measurement,it has attracted extensive attention from universities and research institutions worldwide.Pressure-sensitive Paint technology has become a frontier technology of pressure measurement in aerodynamic experiments.For application in dynamic pressure measurement,Fast-responding Pressure-sensitive Paint technology have developed rapidly since 2000,and become the trend of Pressure-sensitive Paint.The response time of Fast-responding Pressure-sensitive Paint can reach milliseconds or even shorter which make it has high time resolution.The preparation and characterization of coatings are the basis and core of the Pressure-sensitive paint measurement technology.The properties of coatings are directly related to the accuracy and applicability of measurement results.At present,there are some stability problems in Fast-responding Pressure-sensitive Paint,such as poor erosion resistance,,limited temperature application range,fast photo-degradation and so on.These problems have become the bottleneck of the development of Pressure-sensitive Paint measurement technology In the fields of hypersonic and power machinery.In this paper,a new Fast-responding Pressure-sensitive Paint based on porous SiO₂ particles are developed.The pressure-measure performance and stability of the coatings are characterized,the result show this new Pressure-sensitive Paint’s mechanical strength and upper limit of applicable temperature have been significantly increased and The rate of photo-degradation decreases significantly.Finally,the preliminary application of Porous-particles Pressure-sensitive Paint in JF-12 hypersonic shock tunnel is realized,and its good performance in extreme experimental environment is verified.The significance of this research,the working principle of Pressure-sensitive Paint,the development of measurement technology,the research status of Fast-responding Pressure-sensitive Paint,and the bottleneck problems in the current measurement technology of Pressure-sensitive Paint are introduced in the introduction.Finally,the main work of this paper is briefly introduced.In the second chapter,the development idea of Fast-responding Pressure-sensitive Paint is introduced firstly,then the selection of materials and preparation process of porous particle pressure sensitive coatings are introduced,and the Porous-particles Pressure-sensitive Paint are preliminarily characterized by spectral analysis,microstructural analysis and surface morphology analysis.In the third chapter,the calibration technology of pressure sensitive coatings is introduced firstly,then the composition and technical principle of static temperature and pressure calibration system and dynamic pressure calibration system are introduced.Finally,the calibration result of Porous-particles Pressure-sensitive Paint is discussed.Through the control group experiment,the effects of different factor on pressure-measure performance are discussed.In the fourth chapter,the stability of fast response pressure sensitive coatings in application test is introduced firstly.Then in order to solve these problems,test experiments were designed to verify its stability,including photodegradation experiment,high temperature resistance experiment and erosion resistance experiment.Finally,the result are discussed.Superior Application Properties of Porous-particles Pressure-sensitive Paint are verified.In the fifth chapter,the test conditions of Porous-particles Pressure-sensitive Paint are introduced.The structure of JF-12 hypersonic shock tunnel and the measurement system of Porous-particles Pressure-sensitive Paint are briefly introduced.The experimental results are simply analyzed and the excellent performance of Porous-particles Pressure-sensitive Paint under extreme experimental conditions is proved.The sixth chapter summarizes the work of this paper,points out the shortcomings of the research work and looks forward to the possible problems in the development of Fast-responding Pressure-sensitive Paint in the future.