Techniques are presented for the measurement of the energy spectrum of flow fluctuations in both axial and lateral flow directions. A simple spectrum analysis is presented by which quantitative distinction may be made between turbulence and the flow disturbances associated with sound waves in ducts. Experimental data are presented which indicate that the energy spectrum of the turbulence is not affected by periodic and random sound disturbances outside the frequency ranges containing the disturbances. Preliminary measurements are presented that illustrate the effect of combustion on the approach-stream velocity-fluctuation spectra in a ram-jet combustor.
展开▼
