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Article: Velocity and spanwise vorticity measurements in an excited mixing layer of a plane jet
Title | Velocity and spanwise vorticity measurements in an excited mixing layer of a plane jet |
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Authors | |
Issue Date | 1996 |
Citation | Experiments in Fluids, 1996, v. 20, n. 5, p. 346-357 How to Cite? |
Abstract | The mixing layer of a plane jet was subjected to periodic weak excitation at two different frequencies corresponding to shear layer mode (St θ =0.012) and preferred mode (St D =0.36). The nozzle exit boundary layer was identical for the unexcited and excited flows. Measurements of mean velocity, longitudinal and lateral velocity fluctuations, Reynolds shear stress and spanwise component of fluctuating vorticity were made over a longitudinal distance x/D of 6 for both the unexcited and the excited flows. Even weak excitation was observed to influence the development of the mixing layer. Under shear layer mode of excitation, the width of the layer and longitudinal turbulence level decrease compared to the naturally developing (unexcited) flow whereas preferred mode of excitation results in increase in the width and turbulence levels. The rms spanwise vorticity showed an increase for shear layer mode of excitation whereas the preferred mode of excitation resulted in a decrease compared to the values in an unexcited flow. Spectra of velocity and vorticity fluctuations exhibited subharmonic peaks, suggesting the possible occurrence of vortex pairing in both unexpected and excited flows. The influence of excitation is found to decrease as x/D increases and is not significant at x/D=6. © 1996 Springer-Verlag. |
Persistent Identifier | http://hdl.handle.net/10722/250433 |
ISSN | 2023 Impact Factor: 2.3 2023 SCImago Journal Rankings: 0.848 |
DC Field | Value | Language |
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dc.contributor.author | Rajagopalan, S. | - |
dc.contributor.author | Ko, N. W M | - |
dc.date.accessioned | 2018-01-16T06:34:01Z | - |
dc.date.available | 2018-01-16T06:34:01Z | - |
dc.date.issued | 1996 | - |
dc.identifier.citation | Experiments in Fluids, 1996, v. 20, n. 5, p. 346-357 | - |
dc.identifier.issn | 0723-4864 | - |
dc.identifier.uri | http://hdl.handle.net/10722/250433 | - |
dc.description.abstract | The mixing layer of a plane jet was subjected to periodic weak excitation at two different frequencies corresponding to shear layer mode (St θ =0.012) and preferred mode (St D =0.36). The nozzle exit boundary layer was identical for the unexcited and excited flows. Measurements of mean velocity, longitudinal and lateral velocity fluctuations, Reynolds shear stress and spanwise component of fluctuating vorticity were made over a longitudinal distance x/D of 6 for both the unexcited and the excited flows. Even weak excitation was observed to influence the development of the mixing layer. Under shear layer mode of excitation, the width of the layer and longitudinal turbulence level decrease compared to the naturally developing (unexcited) flow whereas preferred mode of excitation results in increase in the width and turbulence levels. The rms spanwise vorticity showed an increase for shear layer mode of excitation whereas the preferred mode of excitation resulted in a decrease compared to the values in an unexcited flow. Spectra of velocity and vorticity fluctuations exhibited subharmonic peaks, suggesting the possible occurrence of vortex pairing in both unexpected and excited flows. The influence of excitation is found to decrease as x/D increases and is not significant at x/D=6. © 1996 Springer-Verlag. | - |
dc.language | eng | - |
dc.relation.ispartof | Experiments in Fluids | - |
dc.title | Velocity and spanwise vorticity measurements in an excited mixing layer of a plane jet | - |
dc.type | Article | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1007/BF00191016 | - |
dc.identifier.scopus | eid_2-s2.0-0030110243 | - |
dc.identifier.hkuros | 12438 | - |
dc.identifier.volume | 20 | - |
dc.identifier.issue | 5 | - |
dc.identifier.spage | 346 | - |
dc.identifier.epage | 357 | - |
dc.identifier.eissn | 1432-1114 | - |
dc.identifier.issnl | 0723-4864 | - |