Radial profile of moments of instantaneous axial velocity of a fully pulsed axisymmetric jet

Pratomo, Hariyo P. S. and Bremhorst, Klaus (2014). Radial profile of moments of instantaneous axial velocity of a fully pulsed axisymmetric jet. In: 2014 International Conference on Science and Engineering in Mathematics, Chemistry and Physics, ScieTech 2014, Jakarta, Republic of Indonesia, (). 13-14 January 2014. doi:10.1088/1742-6596/495/1/012006


Author Pratomo, Hariyo P. S.
Bremhorst, Klaus
Title of paper Radial profile of moments of instantaneous axial velocity of a fully pulsed axisymmetric jet
Conference name 2014 International Conference on Science and Engineering in Mathematics, Chemistry and Physics, ScieTech 2014
Conference location Jakarta, Republic of Indonesia
Conference dates 13-14 January 2014
Journal name Journal of Physics: Conference Series   Check publisher's open access policy
Place of Publication Bristol, United Kingdom
Publisher Institute of Physics Publishing
Publication Year 2014
Sub-type Fully published paper
DOI 10.1088/1742-6596/495/1/012006
Open Access Status DOI
ISSN 1742-6596
1742-6588
Volume 495
Issue 1
Total pages 10
Language eng
Abstract/Summary Radial distribution of the first and higher moments of instantaneous axial velocity of a fully pulsed round jet were investigated along 80 diameters downstream from the jet exit. Response of the unsteady flow to the varying Reynolds and Strouhal numbers thus allowing a series of distinct pulses were sampled using a single wire hot-wire anemometer. It was found that the first moments, as compared to steady jet phenomena, do not maintain self-similarities over the flow domain but their shapes remain unchanged. At a lower Reynolds and Strouhal number, widening radial profiles of the first moment are obtained. Transverse profiles of the third and fourth turbulence moments explain the nature of random process in the mechanically excited jet. Their values were found to remarkably depart from the Gaussian values and to be significantly higher than those of the steady jet across the observed jet widths hence yielding more intense-highly irregular motions and more spreading jet. For all the tested cases, it was demonstrated that the direct effects of the controlled parameters on the flow field become stronger in the outer region than in the inner conterpart of the jet width.
Keyword Hot-wire anemometer
Mass flow rate
Pulsing frequency
Unsteady jet
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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