A novel laser Doppler anemometer (LDA) for high-accuracy turbulence measurements

Yaacob, Mohd Rusdy; Schlander, Rasmus Korslund; Buchhave, Preben; Velte, Clara Marika

doi:10.48550/arxiv.1905.08066

Cited by 1 publication

(4 citation statements)

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“…In the present work, we describe a high Reynolds number jet experiment in air using a sophisticated laser Doppler anemometer, developed for velocity measurement in a flow with high turbulence intensity (Yaacob et al, 2019). The objective is to present unique highquality measurements in the round, turbulent jet that, across the jet flow, map out higher order statistical moments, dynamic moments, and other important quantities of interest.…”

Section: Statistical Function Definition Dimensionmentioning

confidence: 99%

“…The axial velocity component was measured with an in-house designed laser Doppler anemometer [see Yaacob et al (2019), which includes a description of the system and processor and the improvements on the measurement quality], see Fig. 4.…”

Section: B Acquisitionmentioning

confidence: 99%

“…Several features distinguish this LDA and make it ideal for measurements in a highly turbulent flow; see also Yaacob et al (2019). The off-axis configuration allows a very small, nearly spherical measuring volume with a diameter of 140 lm.…”

Section: B Acquisitionmentioning

confidence: 99%

“…The signal processing is software based, see Yaacob et al (2019). Upon processing, each measured (burst) signal time record results in a data file containing measured values for particle arrival time, residence time, and velocity.…”

Section: Signal and Data Processingmentioning

confidence: 99%

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Similarity scaling of the axisymmetric turbulent jet

Zhu

Tian

Buchhave³

et al. 2022

Physics of Fluids

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In this work, we find that a free axisymmetric jet in air displays self-similarity in the fully developed part of the jet ([Formula: see text] jet exit diameters from the jet exit). We report accurate measurements of first, second, and third order spatially averaged statistical functions of the axial velocity component performed with a laser Doppler anemometer, including the outer (high intensity, [Formula: see text]) regions of the jet. The measurements are compared to predictions derived from a simple jet model, which is described in a separate publication, and we discuss the implications for the further study of self-similarity in a free jet. It appears that all statistical functions included in this study can be scaled with a single geometrical scaling factor—the downstream distance from a common virtual origin, [Formula: see text].

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Section: Statistical Function Definition Dimensionmentioning

confidence: 99%

Section: B Acquisitionmentioning

confidence: 99%

Section: B Acquisitionmentioning

confidence: 99%

Section: Signal and Data Processingmentioning

confidence: 99%

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