Results 181 to 190 of about 10,186 (228)

Turbulent deflagrations, autoignitions, and detonations

Combustion, Explosion, and Shock Waves, 2012
Measurements of turbulent burning velocities in fan-stirred explosion bombs show an initial linear increase with the fan speed and RMS turbulent velocity. The line then bends over to form a plateau of high values around the maximum attainable burning velocity.
Bradley, Derek, Lawes, Malcolm, Mansour, Morkous S.   +2 more
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Scramjet Fuels Autoignition Study

Journal of Propulsion and Power, 2001
A series of shock-tube experiments was conducted to measure and compare the ignition-delay times of several fuel candidates for scramjet propulsion and to evaluate the importance of fuel cracking on the autoignition of endothermic-fuel/product mixtures.
Meredith B. Colket, Louis J. Spadaccini
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Autoignition in methanehydrogen mixtures

Combustion and Flame, 1984
Abstract Induction time and strong ignition limit associated with autoignition are determined experimentally for 11 mixtures of methanehydrogenoxygen using the reflected shock technique. The experimental conditions cover temperatures from 800 to 2400K and pressures from 1 to 3 atm. The induction time data, τ, obtained for the methaneoxygen and the
R.K. Cheng, A.K. Oppenheim
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Autoignition of methanol: Experiments and computations

International Journal of Chemical Kinetics, 2011
AbstractAn experimental and computational investigation into the autoignition of methanol under high‐pressure and low‐to‐intermediate temperature conditions is conducted. The ignition delay results have been obtained using a heated rapid compression machine, over a pressure range of 7–30 bar, a temperature range of 850–1100 K, and an equivalence ratio ...
Kamal Kumar, Chih‐Jen Sung
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Turbulent broadening of autoignition limits

Symposium (International) on Combustion, 1994
The authors present a model for calculating the autoignition time in a turbulent flow in which fuel and air are being mixed. The model is applied to the 40-atm heptane-air system. Chemical kinetics are described by a four-step reduces mechanism or a 19-step reduced mechanism. Mixing is described by a particle-tracking probability density function (PDF)
Sanjay M. Correa, Anthony J. Dean
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Autoignition of ethylene in shock waves

Russian Journal of Physical Chemistry B, 2010
The delay time of ignition of various C2H4-O2-Ar mixtures behind reflected shock waves were measured at temperatures of 1090–1520 K and a pressure of 0.65 ± 0.05 MPa. A kinetic scheme of the ignition of ethylene based on the known rate constants of the key elementary reactions was developed.
A. M. Tereza, V. G. Slutskii, E. S. Severin   +2 more
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Autoignition of sprays in a cylindrical combustor

International Journal of Heat and Mass Transfer, 2001
Abstract In this work, the physical characteristics of autoignition phenomena of liquid fuel sprays injected into hot and stagnant air, has been investigated. Eulerian (gas)/Lagrangian (droplets) formulations were adopted to analyze the two-phase flow in a confined 2D axisymmetric cylindrical combustor.
Kang, SH, Baek, SW Baek, Seung-Wook, Choi, JH   +2 more
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An approach to the autoignition of a turbulent mixture

Acta Astronautica, 1974
Abstract This paper considers the turbulent homogeneous mixing of two reactants undergoing a one step, second order, irreversible, exothermic chemical reaction with a rate constant of the Arrhenius type. A statistically stationary turbulent velocity field is assumed given and unaffected by mass or heat production due to the chemical reaction ...
Dopazo, Cesar, O'Brien, Edward E.
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Autoignition behavior of practical fuels

2018
Spark ignition (SI) and compression ignition (CI) engine fuels are characterized by standards developed in 1927 and 1932, respectively. Over the course of these years, modern engines have drastically changed their operating conditions; however, these fuel indexes are still used today with no significant change to their definition.
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Autoignition of hydrogen at high pressure

Combustion and Flame, 1997
Abstract The spontaneous ignition of hydrogen at pressures between 3.5 and 7 MPa has been investigated. A free piston compressor was used to rapidly increase the temperature and pressure of a mixture of hydrogen, oxygen, and helium. Explosion occurred during the stroke, and was detected by a piezoelectric pressure transducer.
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