Transition to turbulence and noise radiation in heated coaxial jet flows

2016 ◽  
Vol 28 (4) ◽  
pp. 044103 ◽  
Author(s):  
Michael Gloor ◽  
Stefan Bühler ◽  
Leonhard Kleiser
Keyword(s):  
Transition To Turbulence ◽  
Jet Flows ◽  
Noise Radiation

scholarly journals Control of a Round Jet Intermittency and Transition to Turbulence by Means of an Annular Synthetic Jet

Actuators ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 185
Author(s):  
Zuzana Antošová ◽  
Zdeněk Trávníček
Keyword(s):  
Reynolds Number ◽  
Active Control ◽  
Flow Regimes ◽  
Velocity Profiles ◽  
Synthetic Jet ◽  
Transition To Turbulence ◽  
Jet Flows ◽  
Maximal Effect ◽  
Hot Wire ◽  
Round Jet

This paper deals with active control of a continuous jet issuing from a long pipe nozzle by means of a concentrically placed annular synthetic jet. The experiments in air cover regimes of laminar, transitional, and turbulent main jet flows (Reynolds number ranges 1082–5181). The velocity profiles (time-mean and fluctuation components) of unforced and forced jets were measured using hot-wire anemometry. Six flow regimes are distinguished, and their parameter map is proposed. The possibility of turbulence reduction by forcing in transitional jets is demonstrated, and the maximal effect is revealed at Re = 2555, where the ratio of the turbulence intensities of the forced and unforced jets is decreased up to 0.45.

Aerodynamic noise

1971 ◽  
Vol 48 (3) ◽  
pp. 593-603 ◽  
Author(s):  
M. J. Fisher ◽  
M. V. Lowson
Keyword(s):  
Jet Noise ◽  
Diffraction Theory ◽  
Aerodynamic Noise ◽  
Jet Flows ◽  
Focus Attention ◽  
Dominant Effect ◽  
Noise Radiation ◽  
Rotor Noise ◽  
Inflow Conditions ◽  
Degree Of Order

A symposium on aerodynamic noise was held at Loughborough University from 14 to 17 September 1970 under the sponsorship of the Royal Aeronautical Society and the British Acoustical Society. The objective of the meeting was to focus attention on unsolved theoretical and experimental problems which will require attention over the next few years. Areas which were covered included jet noise, nonlinear acoustics, rotor noise, and diffraction theory. The symposium was successful in bringing together several new themes in aerodynamic noise research. The most significant of these were the existence of a degree of order in turbulent jet flows, and the dominant effect of inflow conditions on rotor noise radiation. In addition an improved and unified basis for jet noise theory seems to be evolving.

Noise Radiation from Impinging Jet Flows

1966 ◽  
Vol 39 (6) ◽  
pp. 1250-1250
Author(s):  
F. Montegani ◽  
Darshan S. Dosanjh
Keyword(s):  
Impinging Jet ◽  
Jet Flows ◽  
Noise Radiation

ON THE TRESHOLD BETWEEN VISCOUS AND INVISCID INSTABILITY ANALYSIS OF FREE JET FLOWS

2019 ◽  
Author(s):  
Mateus Avanci ◽  
davi souza ◽  
Leonardo Santos de Brito Alves ◽  
Rômulo Bessi Freitas
Keyword(s):  
Jet Flows ◽  
Instability Analysis ◽  
Free Jet ◽  
Inviscid Instability
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