Unsteady film cooling with imposed nonuniform pulsations of the main flow
T.YU. Izmodenova1, N.N. Kortikov2, N.B. Kuznetsov3
1 Klimov JSC, St. Petersburg, Russia, tizm@mail.ru
2 Saint-Petersburg State Polytechnic University, Saint Petersburg, Russia, n-kortikov@yandex.ru
3 Klimov JSC, St. Petersburg, Russia
Keywords: unsteady film, cooling efficiency, main flow pulsations, Strouhal number
Pages: 623-628
Abstract
Effects of the main flow pulsations on the unsteady adiabatic film cooling efficiency were investigated. The possibility of using the critical value of the modified Strouhal number for the single-row perforation to identify the quasi-steady flow in the double-row perforation was proved. The penetration of disturbances into the perforation channels due to “plunger” effect was observed. The influence of the imposed pulsations on the adiabatic film cooling efficiency was shown to be weaker for the double-row perforation as compared to the single-row perforation.
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