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Auxiliary Hydraulic Variables
Published in Jochen Aberle, Colin D. Rennie, David M. Admiraal, Marian Muste, Experimental Hydraulics: Methods, Instrumentation, Data Processing and Management, 2017
Jochen Aberle, Colin D. Rennie, David M. Admiraal, Marian Muste
Pressure Sensitive Paint (PSP) is used for optical measurements of surface-pressure distributions. The working principles of PSP are based on the phenomenon of oxygen quenching of luminescence, also known as the Kautsky-effect. The PSP technique enables a non-contact investigation of changes in surface-pressure without disturbing the flow. It has the capability of providing areal measurements over the entire surface of a body. The higher the pressure, the higher the partial pressure of the oxygen and the more the intensity emitted by the coating is attenuated. The PSP technique has many advantages over traditional pressure measurement techniques. Therefore it has been extensively used in fluid dynamics, mainly in wind tunnel experiments in the field of aviation.
Surface Pressure Measurements in a Model Helical Coil Steam Generator Using Pressure Sensitive Paint
Published in Nuclear Technology, 2020
G. A. Porter, M. Delgado, Y. A. Hassan
Pressure measurements are crucial in nuclear thermal hydraulics for determining pumping power, heat transfer efficiencies, and computational fluid dynamics (CFD) simulations. Measurement systems regularly utilize pressure transducers to determine surface pressure distributions, pressure drops, and single-point pressures. These measurement devices are invasive, and in some cases require hundreds of installations to provide reasonable spatial resolutions. Pressure sensitive paint (PSP) is a noninvasive optical measurement technique that provides excellent spatial resolutions with response times ranging from the order of microseconds to seconds depending on paint formulation. PSP relies on oxygen, seen most commonly in the form of air, to be used as the working fluid. Wind tunnels utilize air, allowing the application and advancement of PSP techniques in the aerospace industry to flourish. Advancements in PSP techniques continue to improve response times, temperature and pressure sensitivities, and human errors, leading to greater applicability in other fields. With current PSP technology it is possible to investigate a wide variety of experimental designs, ranging from those with low-speed unsteady flow conditions1,2 to facilities utilizing complex geometries operating in Mach speeds.3,4 For a comprehensive history of the development of PSP, studies by Liu and Sullivan,5 Gregory et al.,6 and most recently Peng et al.2 provide a full review.