Publication detail

Power Spectral Density of Velocity Fluctuations Estimated from Phase Doppler Data

JEDELSKÝ, J. LÍZAL, F. JÍCHA, M.

Original Title

Power Spectral Density of Velocity Fluctuations Estimated from Phase Doppler Data

Type

conference paper

Language

English

Original Abstract

Laser Doppler Anemometry (LDA) and its modifications such as Phase-Doppler Particle Anemometry (P/DPA) is point-wise method for optical non-intrusive measurement of particle velocity with high data rate. Conversion of the LDA velocity data from temporal to frequency domain – calculation of power spectral density (PSD) of velocity fluctuations, is a non trivial task due to non-equidistant data sampling in time. We briefly discuss possibilities for the PSD estimation and specify limitations caused by seeding density and other factors of the flow and LDA setup. Arbitrary results of LDA measurements are compared with corresponding Hot Wire Anemometry (HWA) data in the frequency domain. Slot correlation (SC) method implemented in software program Kern by Nobach (2006) is used for the PSD estimation. Influence of several input parameters on resulting PSDs is described. Optimum setup of the software for our data of particle-laden air flow in realistic human airway model is documented. Typical character of the flow is described using PSD plots of velocity fluctuations with comments on specific properties of the flow. Some recommendations for improvements of future experiments to acquire better PSD results are given.

Keywords

Power Spectral Density, Velocity Fluctuations, Phase Doppler Anemometry

Authors

JEDELSKÝ, J.; LÍZAL, F.; JÍCHA, M.

RIV year

2011

Released

22. 11. 2011

Publisher

EDP Sciences

Location

Liberec, Czech Republic

ISBN

978-80-7372-784-0

Book

EPJ Web of Conferences

Edition

1

ISBN

2100-014X

Periodical

EPJ Web of Conferences

Year of study

25

Number

1

State

French Republic

Pages from

219

Pages to

226

Pages count

8

URL

http://www.epj-conferences.org/articles/epjconf/abs/2012/07/epjconf_EFM2011_01034/epjconf_EFM2011_01034.html

Full text in the Digital Library

http://hdl.handle.net/11012/194222

BibTex

@inproceedings{BUT75134,
  author="Jan {Jedelský} and František {Lízal} and Miroslav {Jícha}",
  title="Power Spectral Density of Velocity Fluctuations Estimated from Phase Doppler Data",
  booktitle="EPJ Web of Conferences",
  year="2011",
  series="1",
  journal="EPJ Web of Conferences",
  volume="25",
  number="1",
  pages="219--226",
  publisher="EDP Sciences",
  address="Liberec, Czech Republic",
  doi="10.1051/epjconf/20122501034",
  isbn="978-80-7372-784-0",
  issn="2100-014X",
  url="http://www.epj-conferences.org/articles/epjconf/abs/2012/07/epjconf_EFM2011_01034/epjconf_EFM2011_01034.html"
}