In the present work we experimentally examined the effect of enhanced freestream turbulence on the film-cooling efficiency in an axisymmetric supersonic nozzle. A considerable reduction in the film-cooling efficiency was observed with increasing level of flow turbulence, both in the subsonic and supersonic parts of the Laval nozzle. For instance, an increase in the freestream turbulence number from 0.2% to 15% resulted in more than twofold deterioration of film-cooling efficiency. A similar decrease of film-cooling efficiency was also observed under off-design flow conditions. At the same time, the increase in the freestream turbulence number had almost no effect on the recovery factor and on the distribution of static pressure over the length of the nozzle. The Kutateladze-Leont'ev asymptotic theory of gas cooling films was used to generalize the experimental data for nozzle flows with allowance for flow nonisothermality, compressibility, longitudinal pressure gradient, and high freestream turbulence number.
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Research Papers
Film-Cooling Efficiency in a Laval Nozzle Under Conditions of High Freestream Turbulence
Valery P. Lebedev,
Valery P. Lebedev
Kutateladze Institute of Thermophysics,
Russian Academy of Sciences
, Siberian Division, 630090, Lavrent'ev Ave., 1, Novosibirsk, Russia
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Vadim V. Lemanov,
Vadim V. Lemanov
Kutateladze Institute of Thermophysics,
Russian Academy of Sciences
, Siberian Division, 630090, Lavrent'ev Ave., 1, Novosibirsk, Russia
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Victor I. Terekhov
Victor I. Terekhov
Kutateladze Institute of Thermophysics,
e-mail: terekhov@itp.nsc.ru
Russian Academy of Sciences
, Siberian Division, 630090, Lavrent'ev Ave., 1, Novosibirsk, Russia
Search for other works by this author on:
Valery P. Lebedev
Kutateladze Institute of Thermophysics,
Russian Academy of Sciences
, Siberian Division, 630090, Lavrent'ev Ave., 1, Novosibirsk, Russia
Vadim V. Lemanov
Kutateladze Institute of Thermophysics,
Russian Academy of Sciences
, Siberian Division, 630090, Lavrent'ev Ave., 1, Novosibirsk, Russia
Victor I. Terekhov
Kutateladze Institute of Thermophysics,
Russian Academy of Sciences
, Siberian Division, 630090, Lavrent'ev Ave., 1, Novosibirsk, Russiae-mail: terekhov@itp.nsc.ru
J. Heat Transfer. Jun 2006, 128(6): 571-579 (9 pages)
Published Online: November 11, 2005
Article history
Received:
July 16, 2005
Revised:
November 11, 2005
Citation
Lebedev, V. P., Lemanov, V. V., and Terekhov, V. I. (November 11, 2005). "Film-Cooling Efficiency in a Laval Nozzle Under Conditions of High Freestream Turbulence." ASME. J. Heat Transfer. June 2006; 128(6): 571–579. https://doi.org/10.1115/1.2188508
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