Determining Model of Sonic Boom Propogation Through a Turbulent Atmosphere PDF Download
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Author: National Aeronautical Establishment (Canada)
Publisher:
ISBN:
Category :
Languages : en
Pages : 35
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Book Description
Author: National Aeronautical Establishment (Canada)
Publisher:
ISBN:
Category :
Languages : en
Pages : 35
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Book Description
Author: B. H. K. Lee
Publisher: 1972.
ISBN:
Category : Shock waves
Languages : en
Pages : 18
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Book Description
The propagation of a weak normal shock wave through a turbulent atmosphere is studied in terms of an idealized model. The turbulent field is assumed to be weak and represented by the superposition of two inclined shear waves of opposite inclination to the mean flow. The resulting flow is of a cellular nature. The cells are rectangular in shape and the sense of rotation of the flow alternates from cell to cell. If the angles made by the normal of the incident shear waves with the direction of the mean flow are greater than some critical value an exponentially decaying pressure wave is generated behind the shock. 'Spiked' or rounded' waveforms are obtained by adding or subtracting this pressure wave from the steady state pressure field. An illustrative example for a mean flow Mach number of 1.0005 is considered. (Author).
Author: Patrice Marc Boulanger
Publisher:
ISBN:
Category :
Languages : en
Pages : 250
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Author: David A. McCurdy
Publisher:
ISBN:
Category : High-speed aeronautics
Languages : en
Pages : 236
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Author: David Luquet
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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This thesis deals with the effects of atmospheric turbulence on the propagation of acoustical shock waves. These effects are of major interest for applications such as sonic boom, buzz saw noise or thunder. A numerical one-way method is developed to model and to simulate three-dimensional nonlinear propagation of acoustical shock waves in a moving heterogeneous medium. It relies on a split-step approach that permits to take into account efficiently the different involved physical mechanisms. To tackle realistic 3D problems (of order of one billion of degree of freedom), the implementation of the method is done using the parallel single program multiple data paradigm. Validity of this method is assessed using multiple test cases. The method is applied to investigate the effects of atmospheric turbulence on sonic boom propagation through the Planetary Boundary Layer. Hence, both under-track boom and boom in the shadow zone are studied for a hypersonic configuration developed in the European project ATLLAS II. Finally, the focusing of weak shock waves on a cusped caustic is simulated. It is the first study of the stability of a nonlinear caustic to flow perturbations to our knowledge.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 242
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Book Description
Author: Ira R. Schwartz
Publisher:
ISBN:
Category : Sonic boom
Languages : en
Pages : 472
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Book Description
Prediction methods for sonic boom generation and propagation with overpressure minimization in supersonic transport design and operation.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 440
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Author: Raymond L. Barger
Publisher:
ISBN:
Category : Shock waves
Languages : en
Pages : 28
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Author: Andrew B. Bauer
Publisher:
ISBN:
Category : Atmospheric turbulence
Languages : en
Pages : 214
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Book Description
An experimental program was undertaken to study the effects of topographical and structural shapes on sonic boom focusing and to study the effects of atmospheric turbulence on sonic boom signatures. These effects were modeled by firing projectiles and by allowing the projectile N waves to interact with model shapes and with turbulent jets. The wave interactions were studied by means of shadowgraph pictures and microphone pressure records. The boom focusing parameters were related to the work of Ting and Pan. A canyon model showed wave amplification factors as large as 14 for a special shape and a particular wave direction of propagation. A large amount of statistical information was obtained from the turbulence interactions. This information was studied and found to be in essential agreement with the theory of Crew, but the mechanisms of the shock front breakup and of certain nonlinear features are not understood. Turbulence scaling parameters are developed and used to relate the model results to full scale. (Author).
