AN ANNULAR IMPINGING JET ALTERNATED BY PULSE-MODULATED SYNTHETIC JETS

0439991 - ÚT 2015 RIV US eng C - Konferenční příspěvek (zahraniční konf.)
Trávníček, Zdeněk - Tesař, Václav
AN ANNULAR IMPINGING JET ALTERNATED BY PULSE-MODULATED SYNTHETIC JETS.
PROCEEDINGS OF THE ASME/JSME 8TH THERMAL ENGINEERING JOINT CONFERENCE 2011. NEW YORK: AMER. SOC. MECHANICAL ENGINEERS, 2011, s. 569-576. VOL 1 PTS A AND B. ISBN 978-0-7918-5454-9.
[ASME/JSME Thermal Engineering Joint Conference /8./. Honolulu (US), 13.03.2011-17.03.2011]
Výzkumný záměr: CEZ:AV0Z20760514
Klíčová slova: gas * evolution * mass-transfer
Kód oboru RIV: BJ - Termodynamika

The present experimental study focuses on a generation and control of annular impinging jets. The used working fluid is air An active flow control system is designed with six radial synthetic jets, which are generated by a common actuator located in the central body of the annular nozzle. The synthetic jets are pulse-modulated. Flow visualization and measurements of the wall pressure and wall heat transfer have been performed. Two flowfield steady patterns A and B (small or large recirculation bubbles, respectively) are recognized. The pattern B exists without the actuation, the unmodulated actuation causes the flowfield switching into the pattern A, and the pulse-modulated actuation generates an alternating flowfield. The present results indicate that the area of higher heat transfer can be slightly spread by means of flow alternation. However, the penalty for this slight gain is a substantial reduction of the heat transfer in the central area.
Trvalý link: http://hdl.handle.net/11104/0243170