Pressure Measurement Systems Basis On Pressure-Sensitive Paint

Pressure measurements made on the surface of wind tunnel models play an important role, particularly in the development of wing design and when covering the complete model surface, forces and moments. Conventionally, surface pressures are measured using hundreds of pressure taps. These are connected to mechanical or electronic scanning systems mounted within the model or, for highest accuracy, large secondary standard pressure transducers mounted externally to the model. These orifices can influence the flow over the model and introduce measurement errors. The introduction of pressure-sensitive paint (PSP) provides a method to measure the pressure on the surface of a model directly without the transducers and tubing. A paint, the luminescence of which is dependent on air pressure, is applied to the surface of a wind tunnel model and the pressure distribution is obtained from the images produced by proper illumination .With PSP technology the potential exists for a considerable saving in the cost of model design and manufacture.In the paper, Two kinds of the pressure-sensitive-paint detecting technology has been introduced: Fluorescence detector of PSP basis on PMT and Detector of PSP basis on CCD. Combining with the preparation technology of PSP, we have brought a design plan that CCD-based pressure measurement system of PSP. And have testified the design plan was feasibility.