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Hydrodynamic stability of a periodically unsteady swirling jet / Carrara, Mark D. in Journal of engineering mechanics, Vol. 135 N° 9 (Septembre 2009) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 135 N° 9 (Septembre 2009) . - pp. 1000-1005 Titre : Hydrodynamic stability of a periodically unsteady swirling jet Type de document : texte imprimé Auteurs : Carrara, Mark D., Auteur ; Haj, Muhammad R., Auteur Article en page(s) : pp. 1000-1005 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Hydraulic  jets  Hydrodynamics  Stability  Velocity. Résumé : The stability characteristics of a jet with a low-frequency time-dependent periodic swirl are determined. An analytical dispersion relation for the perturbations is obtained and solved numerically. Growth rates and celerities determined from this formulation are compared with predictions based on applying steady state analysis to instantaneous velocity profiles, i.e., the quasisteady approach. The results show that periodic unsteadiness in the swirl causes variations in the growth rates and celerities of the unstable modes. Furthermore, it is shown that the quasisteady approach is not applicable and fails to predict the magnitudes of these variations. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JENMDT&smode=strres [...] [article] Hydrodynamic stability of a periodically unsteady swirling jet [texte imprimé] / Carrara, Mark D., Auteur ; Haj, Muhammad R., Auteur . - pp. 1000-1005. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 135 N° 9 (Septembre 2009) . - pp. 1000-1005 Mots-clés : Hydraulic  jets  Hydrodynamics  Stability  Velocity. Résumé : The stability characteristics of a jet with a low-frequency time-dependent periodic swirl are determined. An analytical dispersion relation for the perturbations is obtained and solved numerically. Growth rates and celerities determined from this formulation are compared with predictions based on applying steady state analysis to instantaneous velocity profiles, i.e., the quasisteady approach. The results show that periodic unsteadiness in the swirl causes variations in the growth rates and celerities of the unstable modes. Furthermore, it is shown that the quasisteady approach is not applicable and fails to predict the magnitudes of these variations. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JENMDT&smode=strres [...]