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Reynolds number effects on fully developed pulsed jets impinging on flat surfaces

Medina, H. and Bénard, Emmanuel and Early, Juliana M. Reynolds number effects on fully developed pulsed jets impinging on flat surfaces. (2013) AIAA Journal, 51 (10). 2305-2318. ISSN 0001-1452

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Official URL: http://dx.doi.org/10.2514/1.J051203


A systematic study of the effect of the Reynolds number on the fluid dynamics and turbulence statistics of pulsed jets impinging on a flat surface is presented. It has been suggested that the influence of the Reynolds number may be somewhat different for a jet subjected to pulsation when compared to an equivalent steady jet. A comparative study of both steady and pulsating jets is presented for a Reynolds number range from Re=4, 730 to Re=10, 000. All the other factors that affect the flowfield are kept constant, which are H∕d = 3, St = 0.25, and d = 30.5 mm. It was found that for the range of the Reynolds numbers tested, pulsation results in a shortening of the jet core, the centerline axial velocity component declines more rapidly, and higher values of the radial velocity component for r∕d > 0.75 are observed. As the Reynolds number increases, the jet spreads more rapidly, the turbulent kinetic energy and nondimensional turbulent fluctuations decrease, and the flowfield near the impinging surface changes drastically, which is evident with the development of a turbulent momentum exchange interaction away from the wall for r∕d > 1.5

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Coventry University (UNITED KINGDOM)
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Other partners > Queen's University Belfast - QUB (UNITED KINGDOM)
Laboratory name:
Deposited On:27 Sep 2013 12:09

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