NOISE CHARACTERISTICS OF JET FLAP TYPE EXHAUST FLOWS.

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作者：
Schrecker, G.O.
Maus, J.R.
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NASA Contractor Reports | 1974年
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Research included a parametric study of the influence of the Mach number (subsonic range only), the slot nozzle aspect ratio and the flap length on the overall radiated sound power and the spectral composition of the jet noise, as measured in a reverberation chamber. Mean and fluctuating velocity profiles, spectra of the fluctuating velocity and space correlograms were also measured in the flow field of jet flaps by means of hot-wire anemometry. It is concluded that at least as much noise is generated in the secondary mixing region as in the primary mixing region. Furthermore, the noise generation of the primary mixing region appears to be unaffected by the presence of a flap.
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