Properties of Oblique Detonation Waves PDF Download
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Author: Wallace Chinitz
Publisher:
ISBN:
Category :
Languages : en
Pages : 10
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Author: Wallace Chinitz
Publisher:
ISBN:
Category :
Languages : en
Pages : 10
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Author: Philip F. Gibber
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 113
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One method of solving the problem of burning or combustion at supersonic speed is by combusting in a stationary detonation wave. Stabilization of a detonation wave has been recently accomplished and is reproducible, but only in laboratory type apparatus. Using two-dimensional steady flow, perfect gas theory, this paper provides solutions for the changes in properties that may be expected across any oblique detonation wave. Equations are established and solved using the Control Data Corporation 1604 digital computer of the U.S. Naval Postgraduate School, Monterey, California, for different values of specific heat ratio, initial Mach number, a function of the flow deflection angle, and the amount of heat added in the detonation. The results appear in tabular form and for several specific values of Mach number and heat addition in graphical form. An example of use of the data is shown with reference to a ramjet engine operating with a stationary detonation wave for the combustion process.
Author: Philip F. Gibber
Publisher:
ISBN:
Category :
Languages : en
Pages : 234
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Author: J. Weber
Publisher:
ISBN:
Category :
Languages : en
Pages : 12
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Author: Bonnie J. McBride
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ISBN:
Category : Chemical equilibrium
Languages : en
Pages : 300
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Author: Adrian Marroquin
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ISBN:
Category : Shock waves
Languages : en
Pages : 170
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Author: Jon Tegnér
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ISBN:
Category : Detonation waves
Languages : en
Pages : 13
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Abstract: "A detonation wave is a combined compression and combustion wave which travels with supersonic speed through a mixture of fuel and oxidizer. The numerical computation of detonation waves is complicated by two important features of the process. First, the solution has sharp gradients and second, the source term can be very large. Strange behavior of the numerical solutions has been reported, for instance waves traveling with the unphysical speed of one cell per time step. This thesis investigates the sensitivity of detonation waves to the diffusive and dissipative mechanisms present. An important dimensionless number in this context is Kr = [mu]K/Q[rho]1. Here [mu] is the viscosity, K is the rate of reaction, Q is the heat release available in the process and [rho]1 is the density in the unburnt state. It is shown that the density peak of the traveling wave depends on Kr and also, that if Kr is sufficiently large, there is no traveling wave solution. The analysis is performed on model problems which are successive simplifications of the full set of conservation laws for mass, momentum, energy and species. Since most numerical methods used for problems with sharp gradients involve extra dissipation (artificial viscosity) they can not uncritically be applied to the computation of detonation waves. The analysis shows that the extra dissipation will not only smear out the sharp gradients (as in ordinary shock wave problems) but also change the character of the solution, typically the speed of the detonation wave and the extreme values obtained. Some remedies are suggested. If extra dissipation is involved in the numerical method it may be necessary to modify the source term, both its size and its dependence on the temperature, in order to retain the correct character of the solution. Typically, if an artificial [mu] is used then the rate of reaction, K, should be modified so that Kr is kept constant."
Author: Jean-Christophe Broda
Publisher:
ISBN:
Category :
Languages : en
Pages : 272
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Author:
Publisher: AIAA
ISBN: 9781600863875
Category : Detonation waves
Languages : en
Pages : 422
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Author: Sandra Anderson Ashford
Publisher:
ISBN:
Category : Detonation waves
Languages : en
Pages : 488
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