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Reynolds number effect on wall pressure fluctuations induced by a subsonic jet on a tangential flat plate
Stefano Meloni, Alessandro Di Marco, Matteo Mancinelli, Roberto Camussi

Last modified: 2018-06-25

Abstract


The effect of varying the nozzle exhaust diameter on the wall pressure fluctuations generated by the tangential flow of a compressible jet over a flat plate is experimentally investigated. Measurements were carried out in geometric similarity scaling the setup according to the nozzle diameters, thus varying the Reynolds number at a fixed Ma. The Mach number of the turbulent jet, exhausting from a convergent nozzle, was about 0.5. The nozzle diameters used for the experiments were of about 1/2’’ and 1’’. An instrumented flat plate was installed tangentially to the jet flow; this is equipped with a traversing system able to set the distance of the flat plate surface in radial direction with millimetre-precision. Different inclinations are also allowed by the system. Two high dynamic and frequency range pressure transducers were used to acquire the signals. Pressure transducers were screwed into a predrilled matrix of 200 pressure taps where the tangential and radial spacing distances correspond to 1/2'’. The database obtained varying the radial distance of the flat plate and the positions of the pressure transducers was analysed in time and frequency domain allowing the clarification of the underlying mechanism that generates and propagates the pressure fluctuations over the flat plate.


Keywords


compressible jet; flat plate; wall pressure

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