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As this happened, the likelihood of auto-ignition increased even further.
In some cases auto-ignition occurs and no ignition source is required.
The JP-6 fuel was encased in nitrogen to prevent auto-ignition at high temperatures.
The common definition of this process is known as auto-ignition which is another form of fire gas ignition.
For perhaps two seconds, nothing happened, except the continued chatter of the auto-ignition and the unwinding of the altimeter.
This safety feature, often termed auto-ignition, helps to ensure that such temperatures do not cause an explosion of the entire airbag module.
Auto-ignition of engine oil droplets.
As the piston travels upward, a compression ratio of 10:1 in a normally aspirated engine will most likely not start auto-ignition.
High-cetane fuel auto-ignites easily; lower-cetane fuels, such as gasoline, require higher temperatures and pressures before auto-ignition.
When auto-ignition occurs too early or with too much chemical energy, combustion is too fast and high in-cylinder pressures can destroy an engine.
Other improvements to the standard airplane airframe included an auto-ignition system, automatic starter disengage for simplified starting procedures and a larger windshield.
Propellants in storage should be periodically tested on the remaining amount of stabilizer, as its depletion may lead to auto-ignition of the propellant.
Auto-ignition temperatures (dust)
With both air and fuel in a closed cylinder, compressing the mixture too much poses the danger of auto-ignition - or behaving like a diesel engine.
The dieseling phenomenon occurs not because the compression ratio is sufficient to cause auto-ignition of the fuel, but a hot spot inside the cylinder starts combustion.
When auto-ignition occurs (before the piston reaches the top of its travel) the up-rising piston is then attempting to squeeze the rapidly expanding (exploding) fuel charge.
The KIVA models have been used to understand combustion chemistry processes, such as auto-ignition of fuels, and to optimize diesel engines for high efficiency and low emissions.
Homogeneous charge compression ignition (HCCI) is a form of internal combustion in which well-mixed fuel and oxidizer (typically air) are compressed to the point of auto-ignition.
Higher octane fuel delays the time required for auto-ignition at a given temperature and pressure, reducing knock; so by burning the fuel charge faster, two flame fronts can decrease an engine's octane requirement.
This is known as auto-ignition or dieseling, and the air/fuel mixture starts to burn due to the high temperature of the compressed gas, and/or the presence of hot metal in the combustion chamber.
When running in auto-ignition mode the timing of the start of the burn is controlled by the operating state of the engine, rather than directly as in a spark ignition or diesel engine.
The goal is to continuously proportion the fresh charge and the hot exhaust gas so that smooth auto-ignition is always achieved at the ideal time, as the piston nears the highest point of its travel in the cylinder.
However, the presence of energetic free radicals during decomposition, particularly in hot gases or mists, can cause auto-ignition to occur at a lower temperature than would otherwise be normal for a similar chemical structure without the peroxy functional group.
Open flame should never be used to melt the propellant, and the mix should always be heated in an oil bath, never over direct heat, to avoid hot spots causing auto-ignition or caramelization and degradation of the propellant.
A fuel with a higher octane rating is less prone to auto-ignition and can withstand a greater rise in temperature during the compression stroke of an internal combustion engine without auto-igniting, thus allowing more power to be extracted from the Otto-Cycle.