Flow field and near and far sound field of a subsonic jet

✍ Scribed by K.B.M.Q. Zaman

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 940 KB
• Volume: 106
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1016/s0022-460x(86)80170-5

✦ Synopsis

Flow and sound field data are presented for a 2.54 cm diameter air jet at a Mach number of 0.50 and a Reynolds number of 3 x 105. Distributions of mean velocity, turbulence intensities, Reynolds stress, spectral components of turbulence as well as of the near field pressure, together with essential characteristics of the far field sound are reported. This detailed set of data for one particular flow, erstwhile unavailable in the literature, is expected to help promote and calibrate subsonic jet noise theories. "Source locations" in terms of the turbulence maxima, coupling between the entrainment dynamics and the near pressure field, the sound radiation paths, and the balance in mass, momentum and sound energy fluxes are discussed. The results suggest that the large scale coherent structures of the jet govern the "source locations" by controlling the turbulence and also strongly influence the near field pressure fluctuations.