Annular Jets and Annular Impinging Jets

0375006 - ÚT 2013 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Turek, Tomáš - Trávníček, Zdeněk - Šafařík, Pavel - Tesař, Václav
Annular Jets and Annular Impinging Jets.
Conference Topical problem of Fluid Mechanics 2012. Praha: Ústav termomechaniky AV ČR, v. v. i, 2012 - (Šimurda, D.; Kozel, K.), s. 105-108. ISBN 978-80-87012-40-6.
[Topical Problems of Fluid Mechanics 2012. Praha (CZ), 15.02.2012-17.02.2012]
Grant CEP: GA AV ČR(CZ) IAA200760801; GA ČR(CZ) GCP101/11/J019
Výzkumný záměr: CEZ:AV0Z20760514
Klíčová slova: annular jet * bistability * hysteresis
Kód oboru RIV: BK - Mechanika tekutin

A near field of annular jets and annular impinging jets is experimentally investigated at three inner/outer diameter ratios 0.84, 0.90 and 0.95. Time-mean velocity profiles are evaluated, and three main flow field zones are distinguished – in agreement with the literature, namely the initial merging zone, the intermediate one, and the fully merged one. A distribution of the pressure on the impingement wall is measured for various nozzle-to-wall distances. Two basic annular impinging jet regimes are clearly distinguished, with either small or large recirculation bubbles. Moreover, a hysteretic behavior has been identified under specific parameters.
Trvalý link: http://hdl.handle.net/11104/0207784