Author: Ted A. Manning
Publisher:
ISBN:
Category :
Languages : en
Pages : 408
Book Description
A Numerical Investigation of Sound Generation in Supersonic Jet Screech
Author: Ted A. Manning
Publisher:
ISBN:
Category :
Languages : en
Pages : 408
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 408
Book Description
A Numerical Investigation of Sound Generation in Supersonic Jet Screech
Author: Ted A. Manning
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
The noise of supersonic jet flows is due in part to the interaction between jet instability waves and the jet shock-cell structure. If no countermeasures are taken, the emitted shock-cell noise will re-excite certain instability wave modes at the nozzle lip and cause resonant feedback to occur. This feedback resonance, known as supersonic jet screech, causes the jet to flap violently at discrete frequencies and generate very strong, narrow banded tones. Jet screech has been shown to be a source of acoustic fatigue in the tail and nozzle structures of supersonic aircraft. It is important that methods for predicting the screech amplitude be developed. Screech sound generation is one such element. We isolate the interaction of an unsteady shear layer with a single oblique shock. To obtain an overall understanding of the phenomenon with fewest simplifications, we study this problem through the numerical solution of the Navier Stokes equations. We then consider idealizations which allow us to obtain a similar but wider range of results with specially linearized Euler equations. The findings of these r0sults motivate the use of geometric acoustics to describe the screech generation process. The Navier-Stokes and Euler simulations have revealed important details about the interaction process, how the acoustic field results, and why screech is so loud. The mechanism for sound production is found to be fundamentally different and more efficient when the instability waves are the large vortices typical of screech, than when they are small disturbances. Geometrical acoustics can be used to explain the leakage effect at high instability wave amplitude. We conclude that the mechanism for high amplitude screech generation is an unsteady modification to the velocity field by the instability waves that permits the incident shock to refract through the shear layer.
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
The noise of supersonic jet flows is due in part to the interaction between jet instability waves and the jet shock-cell structure. If no countermeasures are taken, the emitted shock-cell noise will re-excite certain instability wave modes at the nozzle lip and cause resonant feedback to occur. This feedback resonance, known as supersonic jet screech, causes the jet to flap violently at discrete frequencies and generate very strong, narrow banded tones. Jet screech has been shown to be a source of acoustic fatigue in the tail and nozzle structures of supersonic aircraft. It is important that methods for predicting the screech amplitude be developed. Screech sound generation is one such element. We isolate the interaction of an unsteady shear layer with a single oblique shock. To obtain an overall understanding of the phenomenon with fewest simplifications, we study this problem through the numerical solution of the Navier Stokes equations. We then consider idealizations which allow us to obtain a similar but wider range of results with specially linearized Euler equations. The findings of these r0sults motivate the use of geometric acoustics to describe the screech generation process. The Navier-Stokes and Euler simulations have revealed important details about the interaction process, how the acoustic field results, and why screech is so loud. The mechanism for sound production is found to be fundamentally different and more efficient when the instability waves are the large vortices typical of screech, than when they are small disturbances. Geometrical acoustics can be used to explain the leakage effect at high instability wave amplitude. We conclude that the mechanism for high amplitude screech generation is an unsteady modification to the velocity field by the instability waves that permits the incident shock to refract through the shear layer.
The Generation and Radiation of Supersonic Jet Noise
Author: Lockheed-Georgia Company
Publisher:
ISBN:
Category : Jet planes
Languages : en
Pages : 270
Book Description
Publisher:
ISBN:
Category : Jet planes
Languages : en
Pages : 270
Book Description
Numerical Investigation of Screech for a 2d Underexpanded Supersonic Rectangular Jet
Author: Timothy J. Rozmajzl
Publisher:
ISBN:
Category :
Languages : en
Pages : 198
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 198
Book Description
Experimental and Numerical Investigation of Supersonic Impinging Jets
Author: F. S. Alvi
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Numerical Investigation on Staged Sonic Jet Interaction Mechanism in a Supersonic Cross Flow
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Studying Turbulence Using Numerical Simulation Databases
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Investigation of the Physics of Screech in Supersonic Jets and Turbulent Boundary Layers at High Reynolds Number and Control of Separation Through Oscillatory Blowing
Author: Hassan M. Nagib
Publisher:
ISBN:
Category : Aerodynamics, Supersonic
Languages : en
Pages : 82
Book Description
Using a flapped NACA 0015 airfoil, measurements of static pressure and lift, with and without oscillatory forcing from the leading edge and flap, demonstrated effective separation control and lift enhancement over the range 0.1
Publisher:
ISBN:
Category : Aerodynamics, Supersonic
Languages : en
Pages : 82
Book Description
Using a flapped NACA 0015 airfoil, measurements of static pressure and lift, with and without oscillatory forcing from the leading edge and flap, demonstrated effective separation control and lift enhancement over the range 0.1
A Numerical Investigation of Sonic Jet Injection for Aerodynamic Control in Supersonic Turbulent Flow
Author: Steven W. Clark
Publisher:
ISBN:
Category : Aerodynamics, Supersonic
Languages : en
Pages : 106
Book Description
Publisher:
ISBN:
Category : Aerodynamics, Supersonic
Languages : en
Pages : 106
Book Description
The Generation and Radiation of Supersonic Jet Noise: Future studies for definition of supersonic jet noise generation and reduction mechanisms
Author:
Publisher:
ISBN:
Category : Jet planes
Languages : en
Pages : 52
Book Description
Publisher:
ISBN:
Category : Jet planes
Languages : en
Pages : 52
Book Description