期刊
SCIENCE
卷 366, 期 6465, 页码 588-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aau7365
关键词
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资金
- National Aeronautics and Space Administration (NASA) [NNH12AT33I]
- Air Force Office of Scientific Research (AFOSR) [F4FGA06055G001]
- AFOSR [FA95501610403]
- Alpha Foundation for the Improvement of Mine Safety and Health [AFC215FO-73]
- DOD HPCMP
- U.S. Department of Defense (DOD) [FA95501610403] Funding Source: U.S. Department of Defense (DOD)
The nature of type Ia supernovae (SNIa)-thermonuclear explosions of white dwarf stars-is an open question in astrophysics. Virtually all existing theoretical models of normal, bright SNIa require the explosion to produce a detonation in order to consume all of stellar material, but the mechanism for the deflagration-to-detonation transition (DDT) remains unclear. We present a unified theory of turbulence-induced DDT that describes the mechanism and conditions for initiating detonation both in unconfined chemical and thermonuclear explosions. The model is validated by using experiments with chemical flames and numerical simulations of thermonuclear flames. We use the developed theory to determine criteria for detonation initiation in the single-degenerate Chandrasekhar-mass SNIa model and show that DDT is almost inevitable at densities of 10(7) to 10(8) grams per cubic centimeter.
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