Journal
PHYSICS OF FLUIDS
Volume 34, Issue 9, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0102812
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Funding
- European Research council
- European Research Council (ERC) under the European Union [803419]
- Poul Due Jensen Foundation
- Poul Due Jensen Foundation (Grundfos Foundation)
- European Research Council (ERC) [803419] Funding Source: European Research Council (ERC)
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This work explores the self-similarity of a free axisymmetric jet in air, specifically in the fully developed region of the jet. Accurate measurements of statistical functions of the axial velocity component are obtained using a laser Doppler anemometer, and these measurements are compared to predictions from a simple jet model. The implications for further study of self-similarity in free jets are discussed.
In this work, we find that a free axisymmetric jet in air displays self-similarity in the fully developed part of the jet ( & GSIM; 30 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, & GSIM; 20 %) 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, z - z(0).
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