Author(s)

P. Piroozan, C. Sciammarella & T. Corke

Abstract

Instantaneous wall pressure measurement in boundary layer flows by means of an optical and neural networks method P. Piroozan*, C. Sciammarella^ & T. Corke^ iMechanical Engineering Department Bucknell University, U.S.A 2Illinois Institute of Technology, U.S.A Abstract The determination of pressures along the surface of a wind tunnel proves difficult with methods that must introduce devices into the flow stream. In this investigation, an optical pressure sensor is presented that is part of the wall and measures the wall pressure fluctuations without disturbing the flow. A special interferometric reflection moire technique is developed and used to produce slope fringes. A CCD camera with a speed of 60 Hz records instantaneous pattern of the slope fringes. A neural network is then used to analyze the fringe patterns and classify the pressures into five levels. A second neural network is used to recognize the pressure patterns and to provide the input to a control system that is c

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