Abstract: The problem of nation transition in an unconfined environment is revisited. The pre-transition flame does not reach the threshold of CJ-deflagration.
Abstract: The problem of nation transition in an unconfined environment is revisited. The transition occurs prior to merging of the flame with the flame-supported precursor shock. Numerical simulations employed are based on the recently developed pseudo-spectral method with time and space adaptation.
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Macek, Transition from deflagration to detonation in cast explosives, J. 31, No. 1, 162–167 (1959). CrossRefGoogle Scholar. 3. C. Tarver, M. Goodale, R. Shaw, and M. Cowperthwaite, ustion transition study for two potential isomeric cast primary explosives, in:Proc. S. V. Tsykin, The similarity problem of flame propagation in a condensed system with allowance for the pressure-dependence of burning rate, in:Questions of Atomic Science and Engineering, Ser. Theor. No. 2 (1993), pp. 10–12.
Whereas nation transition in confined systems is a matter of common knowledge, feasibility of the transition in unconfined space is still a matter of controversy.
Deflagration to detonation transition (DDT) refers to a phenomenon in ignitable mixtures of a flammable gas and air (or oxygen) when a sudden transition takes place from a deflagration type of combustion to a detonation type of explosion. A deflagration is characterized by a subsonic flame propagation velocity, typically far below 100 metres per second (220 mph), and relatively modest overpressures, say below . bars (. psi).
PDF The deflagration to detonation transition (DDT) in both pressed . condensed phase, respectively. The transition from a porous sample to a single crystal means formally a decrease in the. porosity up to zero.
PDF The deflagration to detonation transition (DDT) in both pressed samples of different porosity and large single crystals of a typical primary. With increasing pressure the burning rate (r) increases and, consequently, the critical diameter of pores decreases. In this case, one would expect a sharp increase the L value for the single.
et a. Transition From Deflagration to Detonation in Condensed Phases, (Israel Program for Scientific Translations, Jerusalem, 1975). personal communication, (1994). 17. Goodman, . Vo. Academic Press, New York, 1975), p. 51–122. et a. presented at the 31st Joint Propulsion Conference, AIAA 95–2859, (1995).
nation transition is the general process by which a subsonic combustion wave (deflagration .
nation transition is the general process by which a subsonic combustion wave (deflagration or flame) becomes a supersonic combustion wave (detonation). 5-7 After a deflagration is cre-. Induction Length ∆. Reaction Products Zone. At high enough Reynolds number the flow will transition from laminar to turbulent with attendant increases in burning velocity and energy release rate due to turbulent structures as discussed below. Flame interaction with reflected shocks. Reflected shocks interact with the flame giving rise to the Rayleigh-Taylor interface instability, which causes the flame to stretch and distort.
Kincaid, presentation at the Workshop on "Transition from Deflagration to Detonation," Atlanta, GA. J . J F. 1978. 1. 2. Related Papers. The Allen Institute for AIProudly built by AI2 with the help of our. Collaborators.
Explosion phases including deflagration and detonation and the transition from deflagration to detonation have .
Explosion phases including deflagration and detonation and the transition from deflagration to detonation have been. In all cases studied, we find that only a small amount of stellar fuel is consumed during deflagration phase, no explosion is obtained, and the released energy is mostly wasted on expanding the progenitor. Products of the failed deflagration quickly reach the stellar surface, polluting and strongly disturbing it.