Swirling annular impinging jets with hysteretic behavior

0329572 - ÚT 2010 RIV US eng C - Konferenční příspěvek (zahraniční konf.)
Trávníček, Zdeněk - Werner, E. - Maršík, František - Kordík, Jozef - Šimurda, David
Swirling annular impinging jets with hysteretic behavior.
Turbulence, Heat and Mass Transfer 6. New York: Begell House Inc, 2009 - (Hanjalić, K.; Nagano, Y.; Jakirlić, S.), s. 497-500. ISBN 978-1-56700-262-1.
[International Symposium on Turbulence, Heat and Mass Transfer (THMT’09) /6./. Řím (IT), 14.09.2009-18.09.2009]
Grant CEP: GA AV ČR(CZ) IAA200760801; GA AV ČR(CZ) IAA200760504; GA ČR(CZ) GA101/09/1959
Výzkumný záměr: CEZ:AV0Z20760514
Klíčová slova: impinging jet * hysteresis * bistability
Kód oboru RIV: BK - Mechanika tekutin

This paper is focused on an annular impinging jet with hysteretic behavior and possibility to control the phenomenon by means of jet swirling. An experimental study was performed with air as the working fluid using flow visualization, hot wire anemometry and wall pressure measurement. The bistability and hysteresis were confirmed and two different flowfield patterns were revealed under the same boundary conditions. It was found that weak swirling (S = 0.03) decreases the tendency to bistability and hysteretic behavior. The Reynolds number effect was also found: the bistability and hysteresis were identified only at Re < 3000.
Trvalý link: http://hdl.handle.net/11104/0175572