Velocity Statistics of a Fully Pulsed Round Jet in Streamwise Direction

Pratomo, Hariyo P. S. and Bremhort, Klaus (2014) Velocity Statistics of a Fully Pulsed Round Jet in Streamwise Direction. Applied Mechanics and Materials, 534. pp. 117-123. ISSN 1662-7482

	Other (Published Paper on Applied Mechanics and Materials, TTP vol. 534) - Published Version Download (1714Kb)
	Other (Published Paper on Applied Mechanics and Materials, TTP, vol. 534) - Published Version Download (25Kb)

Abstract

Keywords: hot-wire anemometer, pulsed jet, Reynolds number, Strouhal number. 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 selfpreserving 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 pulsedominated region.

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