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The autoignition temperature or self-ignition temperature, often called spontaneous ignition temperature or minimum ignition temperature (or shortly ignition temperature) and formerly also known as kindling point, of a substance is the lowest temperature at which it spontaneously ignites in a normal atmosphere without an external source of ignition, such as a flame or spark. [1]
The fire point, or combustion point, of a fuel is the lowest temperature at which the liquid fuel will continue to burn for at least five seconds after ignition by an open flame of standard dimension. [1] At the flash point, a lower temperature, a substance will ignite briefly, but vapour might not be produced at a rate to sustain the fire ...
Pressure in cylinder pattern in dependence on ignition timing: (a) - misfire, (b) too soon, (c) optimal, (d) too late. In a spark ignition internal combustion engine, ignition timing is the timing, relative to the current piston position and crankshaft angle, of the release of a spark in the combustion chamber near the end of the compression stroke.
A diesel-fueled engine has no ignition source (such as the spark plugs in a gasoline engine), so diesel fuel can have a high flash point, but must have a low autoignition temperature. Jet fuel flash points also vary with the composition of the fuel. Both Jet A and Jet A-1 have flash points between 38 and 66 °C (100 and 151 °F), close to that ...
It has a low freezing point of less than −110 °C (−166 °F) and the flash point is 130 °F (54 °C). The high energy density of 39.6 MJ/L makes it ideal for military aerospace applications - its primary use. The ignition and burn chemistry has been extensively studied. [8] [9] [10] The exo isomer also has a low freezing point.
Attaining the best combustible or explosive mixture of a fuel and air (the stoichiometric proportion) is important in internal combustion engines such as gasoline or diesel engines. The standard reference work is still that elaborated by Michael George Zabetakis , a fire safety engineering specialist, using an apparatus developed by the United ...
The effects may include: corrosion, abrasive wear, clogged cylinder valves, fuel equipment damage, fuel pump failure, premature ignition, ignition failure, explosion, or engine failure. [1] Several indices are used to characterise fuels. [2] For spark-ignition engines the fuel has an octane rating.
Fuel is injected into a constant volume combustion chamber at approximately 575 °C and 310 psi (21 bar). The time between the start of injection and the recovery of the combustion chamber pressure to 310 psi (21 bar) is defined as the ignition delay. This measured ignition delay is then used to calculate the DCN of the fuel.