Velocity Statistics of a Fully Pulsed Round Jet in Streamwise Direction
| Main Authors: | Pratomo, Hariyo P. S. , Bremhort, Klaus |
|---|---|
| Format: | Article PeerReviewed Lainnya |
| Terbitan: |
Trans Tech Publications, Switzerland
, 2014
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| Subjects: | |
| Online Access: |
https://repository.petra.ac.id/16486/1/AMM%2DAfiliasi.xps https://repository.petra.ac.id/16486/2/AMM.534.117 http://www.scientific.net/AMM https://repository.petra.ac.id/16486/ |
Daftar Isi:
- 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.