Turbulence measurement in Axisymmetric air jet using the Particle Image Velocimetry

Murugan, Raju and Bollu, Bharadwaz and Kolhe, Pankaj (2018) Turbulence measurement in Axisymmetric air jet using the Particle Image Velocimetry. In: 7th International & 45th National Fluid Mechanics and Fluid power conference (FMFP-2018),, 2018, Bombay, India.

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Abstract

Particle imaging velocimetry measurements were carried out in axisymmetric turbulent air jet for Reynolds number range covering transition (Re: 2350 to 4000) and turbulent flow (Re: 5000 to 11000) regime based on jet exit conditions. Endeavor was to provide near the field statistical information of velocity field in turbulent axisymmetric jet of diameter, d = 6.9 mm. Test case of Re = 11000 was used to validate the PIV measurements carried out with that in the literature. Radial profiles of normalized mean velocity and turbulent intensity are in agreement with previous studies. Transition from top hat velocity profile at nozzle exit to Gaussian velocity profile at the end of potential core region is observed. At any fixed axial location downstream of potential core region, mean axial velocity profile in normalized coordinates show the same underlying radial distribution for Reynolds number in turbulent regime (Re > 4000) at nozzle exit.

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