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0-percent porosity 1.6 Mach number 3.1 percent 3.1-percent-porosity test section 6-foot supersonic wind 800-hertz peak amplifier Charge amplifier amplitudes to rms average rms pressure balance chamber bellmouth bl Porosity Charge amplifier Charge coefficients for trans compressor displays of fluctuating disturbance at 800 dynamic pressure Effect of Mach fluctuating pressure coefficients Fluctuating pressure data fluctuating pressure peak-to-peak MACH NUMBER RANGE maximum nonporous test section number on fluctuating percent of dynamic porosity of 3.1 porous region porous test section power spectral density presented in figure pressure disturbances Pressure Fluctuations pressure peak-to-peak amplitudes pressure perturbations pressure transducer pressures for transducer results were similar Reynolds number rms amplitudes rms pressure coefficient Root-mean-square amplitudes Schlieren section average porosity shown in figure Sonic spectrum analyzer spectral density displays Spectral displays subsonic Mach numbers supersonic Mach numbers supersonic wind tunnel tape loop test sec test section average test section porosity test section wall Transducer K4 Transonic