MODELING OF MOTION-CAPTURING PRESSURE SENSITIVE PAINT METHOD FOR QUANTITATIVE SURFACE PRESSURE MEASUREMENT

A desire to understand unknown phenomena is a fundamental part of all scientific research. A deeper understanding expands current engineering capabilities and aids the development of future technologies. The lack of experimental data is a critical limitation for the study of unknown phenomena, especially those involving unsteady flow and nonstationary object motion. Nonintrusive experimental measurement techniques are necessary to tackle those problems. Motion-capturing PSP method is one nonintrusive experimental measurement technique that can measure unsteady surface pressure on nonstationary objects. However, this method still faces challenges when applied to measurements that have small pressure fluctuations. Various factors in flow conditions, PSP characteristics, and a measurement system significantly influence measurement accuracy. Connecting the factors to the measurement accuracy helps deepen understanding of the motion-capturing PSP method measurement and gives new insights for improving the method.
In this thesis, five theoretical models and one empirical model were proposed. The proposed models give physical interpretations that yield a deeper understanding of the photochemical physics present in PSP measurements. The models are validated using experimental data. Two scenarios of applying the validated models in practical applications are also discussed. Those enable the applications of the motion-capturing PSP method to a number of novel applications such as ballistic range experiments, rotating propellers, blast tube experiments, etc.