Results 151 to 160 of about 1,609 (208)
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ATZautotechnology, 2007
Gasoline HCCI, also called Controlled Auto-Ignition (CAI), allows for significant efficiency gains in combination with extremely low NOx emissions when compared to conventional spark-ignited combustion concepts. Bosch’s option to combine a lean-operating direct-injection engine with a simple exhaust gas aftertreatment system (three-way catalytic ...
André Kulzer +5 more
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Gasoline HCCI, also called Controlled Auto-Ignition (CAI), allows for significant efficiency gains in combination with extremely low NOx emissions when compared to conventional spark-ignited combustion concepts. Bosch’s option to combine a lean-operating direct-injection engine with a simple exhaust gas aftertreatment system (three-way catalytic ...
André Kulzer +5 more
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On the regimes of auto-ignition in a turbulent medium
Applied Scientific Research, 1993The process of auto-ignition in a non-premixed, homogeneous and isotropic turbulent medium is considered. The governing pdf transport equation is simulated via a Monte Carlo method. It is found that the pdf evolution depends on the relative magnitudes of two time scales, namely, that of turbulent mixing and of chemical reaction. Calculations made for a
K. N. Lakshmisha, B. Rogg, K. N. C. Bray
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Stochastic simulation of hydrogen–oxygen auto-ignition at the microscale
The Journal of Chemical Physics, 2023A hybrid stochastic simulation method is developed to study H2–O2 auto-ignition at the microscale. Simulation results show that the discrete and stochastic characteristics of reaction collisions have notable impacts on the ignition process, particularly in the early stages when only a few radicals exist.
C. Yang +4 more
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The auto-ignition temperature of methane
Journal of Hazardous Materials, 1984Abstract An improved method for measuring auto-ignition temperatures of gaseous fuels has been developed. Results are reported for methane—air mixtures and compared with previous work. It appears that the normally accepted minimum auto-ignition temperature for methane of 537 (or 540)°C was theoretically rather than experimentally derived.
C. Robinson, D.B. Smith
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Applied Energy, 2013
Abstract The inability to control the auto ignition in CAI combustion is an obstacle against its practical use, and the in-cylinder thermal and component distributions are being investigated in more depth as a way to control auto ignition. A 3D simulation using KIVA code is applied to study the effects of intake backflow on the in-cylinder situation.
Nan Li +4 more
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Abstract The inability to control the auto ignition in CAI combustion is an obstacle against its practical use, and the in-cylinder thermal and component distributions are being investigated in more depth as a way to control auto ignition. A 3D simulation using KIVA code is applied to study the effects of intake backflow on the in-cylinder situation.
Nan Li +4 more
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Auto-ignition of a polydisperse fuel spray
Proceedings of the Combustion Institute, 2007Abstract In the present paper, the effect of fuel spray polydispersity on the auto-ignition process in a fuel cloud is considered. In many engineering applications it is common practice to relate to the actual polydisperse spray as being equivalent to a monodisperse spray with all droplets therein having some average diameter.
Viatcheslav Bykov +3 more
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Auto-ignition of hydrazine by engineering materials
16th Aerospace Sciences Meeting, 1978Hydrazine, being a monopropellant, can explode and/or detonate in contact with some materials. This has been generally recognized and minimized by testing the compatibility of engineering materials with hydrazine at ambient temperature. Very limited tests have been done at elevated temperatures.
J. PERKINS, W. RIEHL
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Modelling auto-ignition in a turbulent medium
Symposium (International) on Combustion, 1992The problem of auto-ignition in an initially non-premixed, homogeneous, isotropic turbulent medium is considered. The equations governing the combined processes of mixing and chemical reaction are formulated. Mixing and reaction progress are described by a mixture-fraction variable ξ and a reaction-progress variable c, respectively.
K.N. Lakshmisha +3 more
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Production-feasible controlled auto-ignition
ATZautotechnology, 2007Controlled Auto-Ignition (CAI) is a unique form of petrol combustion. To date, most work has been based on a research environment that requires complex hardware in order to function. Mahle Powertrain has focused its work on achieving a near-term, low-cost, production-feasible controlled auto ignition solution.
Hugh Blaxill, Alasdair Cairns
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Theory of ignition and auto-ignition
Combustion and Flame, 1962Abstract A fuel-oxidant system may auto-ignite, be ignited by a source, or remain non-inflammable depending upon the ambient temperature, pressure, composition, geometry of the container, etc. This paper presents a theoretical attempt to explain how all these observed phenomena can occur in a given chemical system.
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