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- W2051809445 abstract "ACOUSTIC measurements have been made in the near (/•/£>< 60, JC/ZX60) field of high Reynolds number (184,000-262,000) axisymmetric cold-air jets exhausting at atmospheric pressure. These measurements were in conjunction with an investigation that characterized the largescale coherent structure in the flowfield of Mach number 0.60.8 jets. Natural jets as well as artificially excited jets were studied. Directivity plots were made for all jets at various frequencies. Overall noise radiated by the jets was found to reach a maximum value around 30 deg from the jet axis. However, individual frequencies emitted maximum sound pressure level (SPL) at different angles from the jet axis. As the angle from the jet axis increased, the spectra of the noise shifted to higher frequencies. It was observed that the coherent structure's axial wave speed decreased with decreasing frequency, much in the same way the angle of peak noise emission decreased with decreasing frequency. We propose that it was this slowing of the wave speed that caused the decrease in the peak noise emission angle. The noise production mechanism in the jet was found to be more responsive to midband excitation frequencies. Excitation at these frequencies caused a small increase in SPL at the frequency of excitation, but a much larger increase in full spectrum noise. Contents The present research was conducted to determine the Mach number dependence of large-scale coherent structures in highspeed, subsonic jet flowfields.1 Acoustic measurements were made in conjunction with the flowfield measurements. This synoptic will present the results of these acoustic measure" @default.
- W2051809445 created "2016-06-24" @default.
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- W2051809445 date "1984-06-01" @default.
- W2051809445 modified "2023-09-27" @default.
- W2051809445 title "Acoustic Measurements in High-speed Subsonic Jets" @default.
- W2051809445 cites W1972189462 @default.
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- W2051809445 doi "https://doi.org/10.2514/3.48513" @default.
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