A Deterministic Model of Sonic Boom Propagation Through a Turbulent Atmosphere PDF Download
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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: 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: National Aeronautical Establishment (Canada)
Publisher:
ISBN:
Category :
Languages : en
Pages : 35
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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 : Aeronautics
Languages : en
Pages : 702
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Author: E. P. Bergman
Publisher:
ISBN:
Category : Noise
Languages : en
Pages : 488
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 242
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Author:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 636
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Author:
Publisher:
ISBN:
Category : Environmental engineering
Languages : en
Pages : 664
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