Direct simulation of ultrafast detonations in mixtures

Patrick D. O'Connor, Lyle N. Long, James B. Anderson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations

Abstract

For nearly a century experimental measurements of the velocities of detonations in gases have been found in general agreement with those of the Chapman-Jouguet (C-J) hypothesis predicting velocities, relative to the burned gases, equal to the speed of sound in the burned gases. This was further supported by the Zeldovich - von Neumann - Döring (ZND) theories predicting Chapman-Jouguet velocities for detonations in which the shock and reaction zones are separated. However, for a very fast reaction, the shock and reaction regions overlap and the assumptions required for the C-J and ZND theories are no longer valid. Previous work with the direct simulation method established conditions for forcing the reaction and shock regions to coalesce in a detonation wave by means of a very fast exothermic reaction. The resulting detonation velocities were characterized as ultrafast, as they were found to exceed the steady-state velocities predicted by the C-J and ZND theories. Continued investigation into the ultrafast regime has allowed for the further development of this inconsistency with theory by including a heavy non-reacting gas in the mixture. The resulting gaseous mixtures closely followed the C-J predicted behavior for slow reactions, and for very fast reactions were found to produce ultrafast detonations with a substantially greater deviation from C-J behavior.

Original languageEnglish (US)
Title of host publicationRAREFIED GAS DYNAMICS
Subtitle of host publication24th International Symposium on Rarefied Gas Dynamics, RGD24
Pages517-522
Number of pages6
DOIs
StatePublished - May 16 2005
Event24th International Symposium on Rarefied Gas Dynamics, RGD24 - Bari, Italy
Duration: Jul 10 2004Jul 16 2004

Publication series

NameAIP Conference Proceedings
Volume762
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other24th International Symposium on Rarefied Gas Dynamics, RGD24
CountryItaly
CityBari
Period7/10/047/16/04

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

O'Connor, P. D., Long, L. N., & Anderson, J. B. (2005). Direct simulation of ultrafast detonations in mixtures. In RAREFIED GAS DYNAMICS: 24th International Symposium on Rarefied Gas Dynamics, RGD24 (pp. 517-522). (AIP Conference Proceedings; Vol. 762). https://doi.org/10.1063/1.1941588