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Heat Transfer Research
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ISSN Imprimer: 1064-2285
ISSN En ligne: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.v39.i2.80
pages 175-182

Separation Region Downstream of an Orifice in a Pulsating Flow

Nikolay I. Mikheev
Hydrodynamics and Heat Transfer Laboratory, Research Center for Power Engineering Problems, Kazan Scientific Center of the Russian Academy of Sciences, 2/31 Lobachevsky st., Kazan 420111, Russia
Irek A. Davletshin
Research Center of Power Engineering Problems, Kazan Scientific Centre of the Russian Academy of Sciences, Lobachevsky str., 2/31, Kazan, 420111, Russia
R. E. Faskhutdinov
Research Center of Power Engineering Problems, Kazan Scientific Center of the Russian Academy of Sciences, 2/31 Lobachevskii Str., Kazan, 420111, Russia
Olga A. Dushina
Hydrodynamics and Heat Transfer Laboratory, Research Center for Power Engineering Problems, Kazan Scientific Center of the Russian Academy of Sciences, 2/31 Lobachevsky st., Kazan 420111, Russia

RÉSUMÉ

Results of experimental investigations of the structure of flow in a separation region under the conditions of external flow pulsations are presented. As the object of investigations we have selected a configuration that includes a bluff barrier attached to the wall. To ensure a nonresonant flow of the investigated range of frequencies, the experiment was carried out with a short channel in which an orifice was installed directly at the inlet. In the flow above the separation region velocity pulsations with a high and virtually constant, over the range of frequencies, relative amplitude of about 0.3 were created at a low level of pressure fluctuations. Experimental data on the structure of a turbulent separation flow under the conditions of superposed external flow velocity pulsations in a wide range of frequencies f = 0−380 Hz were obtained and generalized in the work. The effect of a double decrease in the dimensions of the separation region in a pulsating flow in comparison with a stationary one has been revealed.