The results of investigations of the aerodynamic characteristics of turbulent jets issuing from nozzles and subjected to the action of various kinds of low-frequency vibrations — transverse, longitudinal, and torsional (during axisymmetric vibrations of the nozzle around the longitudinal axis) — are presented. Data on the laws governing changes in the average and pulsation velocities along the jet axis, as well as on the spectra of velocity pulsations in the zone of jet mixing, have been obtained. It has been established that at low-frequency vibrations of the nozzle a noticeable intensification of jet mixing is attained. The same effects as on acoustic excitation of a jet are observed. The experiments were carried out at Reynolds numbers Re = 2∙104–8∙104.
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Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 82, No. 5, pp. 830–833, September–October, 2009.
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Vlasov, E.V., Ginevskii, A.S., Gostev, E.A. et al. Influence of nozzle vibrations on the aerodynamic characteristics of a jet. J Eng Phys Thermophy 82, 828–832 (2009). https://doi.org/10.1007/s10891-009-0264-z
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DOI: https://doi.org/10.1007/s10891-009-0264-z