Author: R. TaghaviPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Large Amplitude Acoustic Excitation of Swirling Turbulent Jets
Author: R. TaghaviModern Developments in Shear Flow Control with Swirl
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781722385910
Category :
Languages : en
Pages : 48
Book Description
Passive and active control of swirling turbulent jets is experimentally investigated. Initial swirl distribution is shown to dominate the free jet evolution in the passive mode. Vortex breakdown, a manifestation of high intensity swirl, was achieved at below critical swirl number (S = 0.48) by reducing the vortex core diameter. The response of a swirling turbulent jet to single frequency, plane wave acoustic excitation was shown to depend strongly on the swirl number, excitation Strouhal number, amplitude of the excitation wave, and core turbulence in a low speed cold jet. A 10 percent reduction of the mean centerline velocity at x/D = 9.0 (and a corresponding increase in the shear layer momentum thickness) was achieved by large amplitude internal plane wave acoustic excitation. Helical instability waves of negative azimuthal wave numbers exhibit larger amplification rates than the plane waves in swirling free jets, according to hydrodynamic stability theory. Consequently, an active swirling shear layer control is proposed to include the generation of helical instability waves of arbitrary helicity and the promotion of modal interaction, through multifrequency forcing. Farokhi, Saeed and Taghavi, R. Unspecified Center NCC3-56...
Scientific and Technical Aerospace Reports
Author: Monthly Catalog of United States Government Publications
Author: Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 856
Book Description
Monthly Catalogue, United States Public Documents
Author: Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1430
Book Description
Proceedings of the ... Congress of the International Council of the Aeronautical Sciences
Author: International Council of the Aeronautical Sciences. CongressPublisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1116
Book Description
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