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Intermittent round jet controlled by lateral pulse-modulated synthetic jets
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SYSNO ASEP 0504632 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Intermittent round jet controlled by lateral pulse-modulated synthetic jets Author(s) Broučková, Zuzana (UT-L) RID, ORCID
Trávníček, Zdeněk (UT-L) RID, ORCIDNumber of authors 2 Source Title Journal of Visualization. - : Springer - ISSN 1343-8875
Roč. 22, č. 3 (2019), s. 459-476Number of pages 18 s. Publication form Print - P Language eng - English Country JP - Japan Keywords flow control ; pulse modulation ; synthetic jet ; flow visualization ; hot-wire anemometry Subject RIV JU - Aeronautics, Aerodynamics, Aircrafts OECD category Aerospace engineering R&D Projects GA16-16596S GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support UT-L - RVO:61388998 UT WOS 000468457800003 EID SCOPUS 85061837989 DOI 10.1007/s12650-019-00550-z Annotation A round air jet was actively controlled by a pair of lateral control jets. The control jets were generated by a pair of opposing synthetic jet actuators, which were driven by the pulse-modulated sinusoidal signal. Two carrier frequencies were tested, namely 160Hz and 840Hz. Moreover, control jets driven by un-modulated sinusoidal signals were also tested. An unforced continuous jet was used as the reference case, and for all cases, the Reynolds number of the main round jet was 1570 (related to the nozzle exit diameter of 10mm). Experiments (flow visualization and hot-wire anemometry) revealed that the flow control caused a suppression of the jet core and a more rapid jet flow decay. In addition, the pulse modulation caused jet intermittency that was distinguished by the periodicity of the time-averaged and fluctuating velocity components. For the case of the lower carrier frequency of 160Hz, a flapping motion of the controlled jet occurred and the jet formed a zigzag pattern. Workplace Institute of Thermomechanics Contact Marie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823 Year of Publishing 2020 Electronic address https://link.springer.com/article/10.1007%2Fs12650-019-00550-z
Number of the records: 1