Hydrodynamic Stability of a Periodically Unsteady Swirling Jet

Autor:	Muhammad R. Hajj, Mark D. Carrara
Rok vydání:	2009
Předmět:	Physics Jet (fluid) Hydrodynamic stability Steady state Classical mechanics Mechanics of Materials Mechanical Engineering Dispersion relation Instantaneous velocity Frequency effect Mechanics Low frequency Stability (probability)
Zdroj:	Journal of Engineering Mechanics. 135:1000-1005
ISSN:	1943-7889 0733-9399
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e9a42eade48746c5d3e580ef36a48633 https://doi.org/10.1061/(asce)em.1943-7889.0000022 Zobrazit plný text záznamu Plný text ve formátu PDF