AN ANNULAR IMPINGING JET ALTERNATED BY PULSE-MODULATED SYNTHETIC JETS

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

AN ANNULAR IMPINGING JET ALTERNATED BY PULSE-MODULATED SYNTHETIC JETS

Popis výsledku v původním jazyce

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 thecentral 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 thatthe 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.

Název v anglickém jazyce

AN ANNULAR IMPINGING JET ALTERNATED BY PULSE-MODULATED SYNTHETIC JETS

Popis výsledku anglicky

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 thecentral 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 thatthe 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.

Druh

D - Stať ve sborníku

CEP obor

BJ - Termodynamika

OECD FORD obor

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Projekt

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Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2011

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

PROCEEDINGS OF THE ASME/JSME 8TH THERMAL ENGINEERING JOINT CONFERENCE 2011

ISBN

978-0-7918-5454-9

ISSN

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e-ISSN

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Počet stran výsledku

8

Strana od-do

569-576

Název nakladatele

AMER. SOC. MECHANICAL ENGINEERS

Místo vydání

NEW YORK

Místo konání akce

Honolulu

Datum konání akce

13. 3. 2011

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000319843000068