Velocity Statistics of a Fully Pulsed Round Jet in Streamwise Direction

Abstract:

In this paper, statistical quantities of a fully pulsed round jet along the jet centerline are reported. A range of the Reynolds (1.5 x 10⁴ < Re < 4 x 10⁴) and Strouhal (0.0064 < St < 0.0076) numbers is used to generate the jet. Physically this unsteady jet produces a series of distinct pulses due to the excitations. The mechanically excitations lead to the appearance of pulse dominated and high turbulence steady jet region in which their existence is of a strong dependence on the level of the controlled parameters. After the pulse merging completes the pulsed jet alters to a self-preserving steady jet with a significantly higher turbulence intensity. Under a constant mass flow rate the pulsed jet tends to be more fluctuating at a less intense pulsation thus permitting the endurance of the normalized periodic component and a more rapid velocity decay in the pulse-dominated region.

• Periodical: Applied Mechanics and Materials (Volume 534)
• Pages: 117-123
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.534.117
• Online since: February 2014
• Authors: Hariyo P.S. Pratomo, Klaus Bremhorst
• Keywords: Hot-Wire Anemometer, Pulsed Jet, Reynolds Number, Strouhal Number

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