Coherent structure identification in a lobed mixer

L. Ukeiley, D. Wick, Mark N Glauser

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

The influence of large scale structures on the flow in a lobed mixer (a device utilized to enhance streamwise vorticity for increased mixing) is examined by a pseudo flow visualization method (v. Delville et al. 1988), and the Proper Orthogonal Decomposition (POD) (v. Lumley 1967). The pseudo flow visualization method utilizes specially designed hot wire rakes with high spatial resolution to provide the capability of plotting instantaneous velocity profiles. In this work, a rake of 15 hot wires is used to provide these profiles for a velocity ratio of 2:1, at several positions downstream of the lobed mixer. From these profiles a detailed description of the flow field is achieved. In particular, from this information, an idea of the spatial extent and shedding frequency of the large scale structures is determined. The shedding frequencies found are consistent with those found from spectral measurements. A one-dimensional version of the POD is then applied, which utilizes the measured streamwise velocity two-point correlation tensor. The pseudo flow visualization technique is then used to view the contribution from each proper orthogonal mode to the instantaneous signal and comparisons made to the full signal.

Original languageEnglish (US)
Title of host publicationAmerican Society of Mechanical Engineers (Paper)
Editors Anon
PublisherPubl by ASME
StatePublished - 1991
Externally publishedYes
EventInternational Gas Turbine and Aeroengine Congress and Exposition - Orlando, FL, USA
Duration: Jun 3 1991Jun 6 1991

Other

OtherInternational Gas Turbine and Aeroengine Congress and Exposition
CityOrlando, FL, USA
Period6/3/916/6/91

Fingerprint

Flow visualization
Wire
Decomposition
Vorticity
Tensors
Flow fields

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

Ukeiley, L., Wick, D., & Glauser, M. N. (1991). Coherent structure identification in a lobed mixer. In Anon (Ed.), American Society of Mechanical Engineers (Paper) Publ by ASME.

Coherent structure identification in a lobed mixer. / Ukeiley, L.; Wick, D.; Glauser, Mark N.

American Society of Mechanical Engineers (Paper). ed. / Anon. Publ by ASME, 1991.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Ukeiley, L, Wick, D & Glauser, MN 1991, Coherent structure identification in a lobed mixer. in Anon (ed.), American Society of Mechanical Engineers (Paper). Publ by ASME, International Gas Turbine and Aeroengine Congress and Exposition, Orlando, FL, USA, 6/3/91.
Ukeiley L, Wick D, Glauser MN. Coherent structure identification in a lobed mixer. In Anon, editor, American Society of Mechanical Engineers (Paper). Publ by ASME. 1991
Ukeiley, L. ; Wick, D. ; Glauser, Mark N. / Coherent structure identification in a lobed mixer. American Society of Mechanical Engineers (Paper). editor / Anon. Publ by ASME, 1991.
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