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Time-volume estimation of velocity fields from nonsynchronous planar measurements using linear stochastic estimation

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journal contribution
posted on 08.07.2019, 14:24 authored by Daniel ButcherDaniel Butcher, Adrian SpencerAdrian Spencer
The work presented in this paper combines multiple non-synchronous planar measurements to reconstruct an estimate of a synchronous, instantaneous flow field of the whole measurement set. Temporal information is retained through the linear stochastic estimation (LSE) technique. The technique is described, applied and validated with a simplified combustor and FSN geometry flow for which 3-component, 3-dimensional (3C3D) flow information is available. Using 3C3D data set, multiple virtual ‘planes’ may be extracted to emulate single planar PIV measurements and produce the correlations required for LSE. In this example, multiple parallel planes are synchronised with a single perpendicular plane that intersects each of them. As the underlying data set is known it therefore can be directly compared to the estimated velocity field for validation purposes. The work shows that when the input time-resolved planar velocity measurements are first POD (proper orthogonal decomposition) filtered, high correlation between the estimations and the validation velocity volumes are possible. This results in estimated full volume velocity distributions which are available at the same time instance as the input field – i.e. a time resolved velocity estimation at the frequency of the single input plane. While 3C3D information is used in the presented work, this is necessary only for validation; in true application planar technique would be used. The study concludes that provided the number of sensors used for input LSE exceeds the number of POD modes used for pre-filtering, it is possible to achieve correlation greater than 99%.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

Journal of Engineering for Gas Turbines and Power

Volume

141

Issue

10

Citation

BUTCHER, D.S.A. and SPENCER, A., 2019. Time-volume estimation of velocity fields from non-synchronous planar measurements using linear stochastic estimation. Journal of Engineering for Gas Turbines and Power, 141 (10), 101004.

Publisher

© American Society of Mechanical Engineers (ASME)

Version

AM (Accepted Manuscript)

Publisher statement

This paper was accepted for publication in the journal Journal of Engineering for Gas Turbines and Power and the definitive published version is available at https://doi.org/10.1115/1.4044240.

Acceptance date

27/06/2019

Publication date

2019-07-29

Copyright date

2019

ISSN

0742-4795

eISSN

1528-8919

Language

en

Article number

101004