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SAE Technical Paper Series, 1954
<div class="section abstract"><div class="htmlview paragraph">AN analysis of jet engine noise as a function of jet engine design characteristics is presented in this paper along with some thoughts as to possible means for reducing the noise of jet transports for the future.</div><div class="htmlview paragraph">The authors ...
John M. Tyler, Edward C. Perry
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<div class="section abstract"><div class="htmlview paragraph">AN analysis of jet engine noise as a function of jet engine design characteristics is presented in this paper along with some thoughts as to possible means for reducing the noise of jet transports for the future.</div><div class="htmlview paragraph">The authors ...
John M. Tyler, Edward C. Perry
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Noise of swirling exhaust jets
3rd Aeroacoustics Conference, 1976Noise and flow characteristics of model swirling jets were measured. A swirling jet from a plug-nozzle generated a strong vortex flow and a broadband noise higher than that of a nonswirling jet. Exit guide vanes were found to be able to decrease the swirl and the noise simultaneously. A swirling jet with a nonswirling jet core flow was tested.
H.Y. Lu, J.W. Ramsay, D.L. Miller
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19th Aerospace Sciences Meeting, 1981
Jet noise is a byproduct of turbulence. Until recently turbulence was assumed to be known statistically, and jet noise was computed therefrom. As a result of new findings though on the behavior of vortices and instability waves, a more integrated view of the problem has been accepted lately.
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Jet noise is a byproduct of turbulence. Until recently turbulence was assumed to be known statistically, and jet noise was computed therefrom. As a result of new findings though on the behavior of vortices and instability waves, a more integrated view of the problem has been accepted lately.
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Experiments on supersonic jet noise
2nd Aeroacoustics Conference, 1975The noise generated by a 1-in. supersonic jet was investigated at nominal jet Mach numbers of 1.5, 2.0, and 2.5. In particular, a quantity W, referred to as the apparent source strength per unit length, was determined along the jet axis using a directional microphone system. The integrated value of W along the jet axis was found to agree with the sound
J. Laufer, R. Schlinker, R. E. Kaplan
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Noise Characteristics of Pulsed Jet
Noise Control Engineering, 1981The exhaust flow of many gas-powered machines consists of a series of distinct pulses. This non-steady jet flow has been studied experimentally by use of a simple pulse jet generator in which a rotating valve interrupts a flow of air. The valve porting was chosen to simulate the exhaust cycle of a pneumatic percussive drill and the noise produced by ...
Hooker, R. J., Rumble, R. H.
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Aerodynamics and Noise of Coaxial Jets
AIAA Journal, 1977The objective of this investigation was to develop a unified prediction method for estimating the aerodynamic and noise characteristics of jets issuing from nozzles of arbitrary geometric shapes. The method has been developed and demonstrated for dual-flow coaxial jets.
Balsa, Thomas F., Gliebe, Philip R.
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The Journal of the Acoustical Society of America, 1953
The noise of a jet changes character after the pressure ratio exceeds the critical value appropriate to sonic exit velocity, the general roar being dominated by a loud “whistling” or “screeching.” Schlieren photographs show that sound waves of ultrasonic frequency are caused by the transition of the initially laminar boundary layer to turbulence, and ...
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The noise of a jet changes character after the pressure ratio exceeds the critical value appropriate to sonic exit velocity, the general roar being dominated by a loud “whistling” or “screeching.” Schlieren photographs show that sound waves of ultrasonic frequency are caused by the transition of the initially laminar boundary layer to turbulence, and ...
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Supersonic gasdispersional jets and jet noise
15th Aeroacoustics Conference, 1993This paper examines the potential for controlling jet noise radiation using methods developed for modifying jet infra-red thermal radiation. The control of jet noise may be possible by properly adding different solid and liquid particles into the jet flow and by using special nozzle shapes to change the jet exhaust flow structure. The numerical methods
M. Gilinsky +3 more
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Hot Jets and Sources of Jet Noise
International Journal of Aeroacoustics, 2010A prediction method based on the generalized acoustic analogy is presented and used to evaluate aerodynamic noise radiated from high-speed hot jets. The set of Euler equations are divided into two sets of equations that govern what may be considered as a non-radiating base flow plus its residual components.
Abbas Khavaran +2 more
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Theoretical and Computational Fluid Dynamics, 1998
Jet noise research was initiated by Sir James Lighthill in 1952. Since that time, the development of jet noise theory has followed a very tortuous path. This is, perhaps, not surprising for the understanding of jet noise is inherently tied to the understanding of turbulence in jet flows. Even now, our understanding of turbulence is still tenuous.
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Jet noise research was initiated by Sir James Lighthill in 1952. Since that time, the development of jet noise theory has followed a very tortuous path. This is, perhaps, not surprising for the understanding of jet noise is inherently tied to the understanding of turbulence in jet flows. Even now, our understanding of turbulence is still tenuous.
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