22-10-2012, 03:50 PM
Effect of Transducer Flushness on Measured Surface Pressure Fluctuations in Flight
ABSTRACT
The procedure for investigating the effect of deviation from flush mounting of pressure transducers on the exterior of
Tu-144LL in flight is described. Experimental data in the mach-number range 0.58 - 2.0 are presented for distortion of the
measured wall-pressure fluctuation spectra of the turbulent boundary layer by recessed and protruding transducers. The results
of flight experiments are compared with data of wind tunnel experiments. The distortion of measured turbulent boundary layer
wall pressure fluctuations caused by transducer-surface deviation from the surrounding surface as a function of dimensionless
parameters is predicted and presented on the basis of dimensional analysis.