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Thursday, July 16, 2020 | History

3 edition of Instabilities and and subharmonic resonances in subsonic heated round jets found in the catalog.

Instabilities and and subharmonic resonances in subsonic heated round jets

# Instabilities and and subharmonic resonances in subsonic heated round jets

Published by University of Arizona, Dept. of Aerospace and Mechanical Engineering in [Tucson, Ariz.] .
Written in English

Subjects:
• Destabilization.,
• Differential equations.,
• Gas jets.,
• Mach number.,
• Parallel flow.,
• Phase velocity.,
• Stability.,
• Subsonic flow.,
• Vibration mode.,
• Vortices.

• Edition Notes

The Physical Object ID Numbers Statement by Lian Lai Ng. Series NASA CR -- 186058., NASA contractor report -- NASA CR-186058. Contributions University of Arizona. Dept. of Aerospace and Mechanical Engineering., Lewis Research Center. Format Microform Pagination 1 v. Open Library OL16139151M

6. Subsonic Aerodynamics of Airfoils and Wings Introduction In this chapter we discuss the subsonic aerodynamics of airfoils and wings. We look at the basic aerodynamics mainly from an inviscid point of view. Generally, this is a reasonable starting point for thinking about aerodynamics in attached flow. Traditionally, the methods used to makeFile Size: 2MB. Mathematical Aspects of Subsonic and Transonic Gas Dynamics (Dover Books on Physics) - Kindle edition by Bers, Lipman. Download it once and read it on your Kindle device, PC, phones or tablets. Use features like bookmarks, note taking and highlighting while reading Mathematical Aspects of Subsonic and Transonic Gas Dynamics (Dover Books on Physics).Manufacturer: Dover Publications.

Subsonic Circular and Coaxial Jets James W. Russell Kentron International, Inc. Hampton, Virginia Prepared for Langley Research Center under Contract NAS National Aeronautics and Space Administration Scientific and Technical Information Office I An investigation of the mechanisms of sound generation in initially laminar subsonic jets using the Goldstein acoustic analogy Browse All of QMRO Communities & Collections By Issue Date Authors Titles Subjects This Collection By Issue Date Authors Titles SubjectsCited by:

Resonance, in particle physics, an extremely short-lived phenomenon associated with subatomic particles called hadrons that decay via the strong nuclear force. This force is so powerful that it allows resonances to exist only for the amount of time it takes light to cross each such “object.” A. Relationship between instability waves and noise of low supersonic jets consider the case of cold supersonic jets in the Mach number range of 1: 0to In closing, we give numerical results obtained by using a spec-tral collocation discretization through a multiple domain technique. 2 Basic formulation Consider small amplitude disturbances superim-.

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### Instabilities and and subharmonic resonances in subsonic heated round jets Download PDF EPUB FB2

Get this from a library. Instabilities and subharmonic resonances in subsonic heated round jets. [Lian L Ng; University of Arizona. Department of Aerospace and. Subharmonic resonances of the parametrically driven pendulum 4 driving frequency and amplitude, the mean torque of the force of inertia depends only on the angle of the pendulum’s deﬂection from the direction of the pivot’s vibration.

In the absence of gravity the inertial torque gives a. The subharmonic component ω/3 in the response is directly induced by the nonlinear term Y 3 in Eq. (6).When ω i = ω / 3, we get Fig.

4 via numerical simulation in which a and F are taken as control parameters. In Fig. 4, with the increase of a and F, the VSubR phenomenon r, comparing Fig. 4 with Fig. 3, the difference between the two figures is by: Vibrational subharmonic and superharmonic resonances Article in Communications in Nonlinear Science and Numerical Simulation 30() July with 1, Reads How we measure 'reads'.

The stability of “top-hat” and fully developed jet profiles is investigated by an inviscid linear stability theory for compressible flow. The study covers a wide range of the Mach number and the temperature ratio.

Two types of instabilities are found: vortical and acoustic, each of which can be subdivided into non-radiating (subsonic) and radiating (supersonic) by: We show that the interaction between a homogeneous bifurcation and diffusive instabilities can give rise to a rich variety of subharmonic and superhar Cited by: Instability waves in a subsonic round jet detected using a near-field phased microphone array Article (PDF Available) in Journal of Fluid Mechanics - October with 89 ReadsAuthor: Tim Colonius.

Experimental investigation of subharmonic resonance in an axisymmetric jet - Volume - C. Paschereit, I. Wygnanski, H. FiedlerCited by: ter. Subharmonic instabilities have been observed in a number of different lasers Subharmonic instabilities have become especially interesting since a sequence of peri-od doublings has been identified as a possible route to chaos.

Instabilities in lasers have existed since the first demon. [3, 16, 31], the noise radiation of round and chevron jets at shallow polar angles is all dominated by low-frequency components, and thus we here plot the growth rates of instability waves in the chevron jet SMC in the frequency range of $$St=\omega D_j/U_j= -$$ at four different streamwise locations $$z/r_0=,$$, Cited by: 4.

Instability waves and low-frequency noise radiation in the subsonic chevron jet 0 5 10 15 0 1 Fig. 2 Meanaxialvelocity(u¯z) linedenotestipline,dashedlinedenotesvalleyline,ﬁlleddiamondfromCited by: 4.

Additional noise sources are generated when an aircraft engine is mounted beneath a wing. The two main installation sources include: (1) reflection of the exhaust jet mixing noise from the underside of the wing, and (2) interaction between the turbulent jet plume and the trailing edge of the wing, or deployed flap.

The strength, directivity and frequency content of these particular sources all Cited by: 9. An analysis of the correlations between the turbulent ﬂow and the sound pressure ﬁelds of subsonic jets C. BOGEYAND C. BAILLY Laboratoire de M´ecanique des Fluides et d’Acoustique, UMR CNRSEcole Centrale de Lyon, Ecully, France (Received 13 March and in revised form 26 January ) Noise generation is investigated in Cited by: The Effect of Temperature on Subsonic Jet Noise BY B.

COCKING National Gas Turbine Establishment Reports and Memoranda No. May, " Summary The noise levels produced by hot and cold subsonic jets have beefi measured using a convergent circular nozzle in an anechoic Size: 1MB.

The noise generated by isothermal round jets at Mach number M = and at the diameter-based Reynolds number Re D = 5 × 10 5, originating from a straight pipe nozzle, is computed directly using Large Eddy Simulation (LES), in order to highlight the potential influence of the inlet.

Low and high speed subsonic jets have been studied in the last 50 years mainly due to their many applications in industry, such as the discharge of turbojets and turbofan engines.

The purpose of this work is to investigate the aerodynamics and the acoustical noise generated by a single stream jet ﬂow operating at low Mach number Center for Turbulence Research Proceedings of the Summer Program Input-output analysis of high-speed jet noise By J.

NicholsyAND M. Jovanovi cz We use input-output analysis to examine subsonic and supersonic turbulent jet noise. Measurements of the noise field from a 25 mm diameter subsonic air jet are presented.

These results are analysed in some detail by determining both the jet velocity dependence and the directivity of the intensity of the radiation in 1/3-octave bands at particular values of the frequency parameter, $(fD/V_J)(1-M_c\cos\theta).$ This procedure should ensure that a particular source in a Cited by: tion of an Isothermal Mach Jet and its Radiated Sound Using Large-Eddy Simulation and Kirchhoff Surface Integration, Inter-national Journal of Heat and Fluid Flow, 26(3), Œ II N.

Andersson, L.-E. Eriksson and L. Davidson,Large-Eddy Simulation of Subsonic Turbulent Jets and Their Radiated Sound, AIAA Journal 43(9) Œ The subharmonic frequency ω/2 in the response is induced by the quadratic term in the equivalent system.

This term is This term is includedinEq.(6).Considering a and F asthecontrolparameters,theVSubRisshowninFigInthisﬁgure,theVSubRalso.

mm diameter free jet at subsonic and supersonic flow conditions. Bridges et al. [12] used PIV to calculate turbulence quantities in nozzle flows from instantaneous 2D velocity maps. Other published works are related to comparison between experimental and numerical results of free turbulent jets.The subharmonic resonance of van der Pol (VDP) oscillator with fractional-order derivative is studied by the averaging method.

At first, the first-order approximate solutions are obtained by the averaging method. Then the definitions of equivalent linear damping coefficient (ELDC) and equivalent linear stiffness coefficient (ELSC) for subharmonic resonance are established, and the effects of Cited by: Subharmonic resonance behavior for the classical hydrogen atomic system Abstract Previously unexplored resonance conditions are shown to exist for the classical hydrogen atomic system, where the electron is treated as a classical charged point particle following the nonrelativis- the main features of the subharmonic resonances that we.