Numerical investigation of synthetic jets driven by thermoacousticstanding waves

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Show simple item record Chen, Geng en Krishan, G en Yang, Yi en Tang, Lihua en Mace, Brian en 2019-11-20T22:33:49Z en 2020-01 en
dc.identifier.issn 0017-9310 en
dc.identifier.uri en
dc.description.abstract We have carried out a preliminary study of the physical processes leading to the formation of a jet into external quiescent surroundings driven by thermoacoustic standing waves. The standing waves are initiated in a thermoacoustic engine (TAE) utilizing the thermoacoustic effect, and the synthetic jet is produced via a jet ejector where a sudden change in the cross-section is employed. We investigate the characteristics of the proposed synthetic jet actuator using both reduced-order network model and computational fluid dynamics (CFD) simulations. The network technique, which is based on linear thermoacoustic theory, can predict the onset of thermoacoustic instability in the frequency domain. The CFD code solves the fully coupled nonlinear compressible flow equations and enables the time-domain analysis of complex flow patterns, which facilitates comprehension of the jet formation process. Both theoretical analysis and numerical simulations reveal that spontaneous, self-excited oscillations inside the TAE will happen when the temperature ratio is greater than the onset temperature ratio for thermoacoustic instability. CFD simulations further identified the transition from no jet to a clear synthetic jet, which determines the onset temperature ratio for jet formation and the threshold value of a non-dimensional parameter. Finally, we carried out a parametric study to investigate the influence of resonator length and orifice diameter on the onset characteristics as well as other performance parameters including the acoustic intensity, space-averaged mean momentum flux, space-averaged velocity and the jet effectiveness. The proposed thermoacoustically-driven synthetic jet actuator may outperform conventional actuators driven by a piston, loudspeaker or piezoelectric transducers on occasions where the surface temperature is high, and therefore has the potential to be utilized for self-cooling purposes. en
dc.publisher Elsevier en
dc.relation.ispartofseries International Journal of Heat and Mass Transfer en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights.uri en
dc.title Numerical investigation of synthetic jets driven by thermoacousticstanding waves en
dc.type Journal Article en
dc.identifier.doi 10.1016/j.ijheatmasstransfer.2019.118859 en
pubs.volume 146 en
dc.rights.holder Copyright: The author en
dc.rights.accessrights en
pubs.subtype Article en
pubs.elements-id 784249 en Engineering en Mechanical Engineering en
pubs.number 118859 en
pubs.record-created-at-source-date 2019-10-18 en 2019-10-17 en

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