Fuels used for aviation are different than those used in the

Fuels used for aviation are different than those used in the internal combustion engines of cars. Typical turbine fuels are Jet A, Jet A-1, and Jet B. What is the main difference between Jet A and Jet A-1? In what climates would Jet B be a better fuel to use? What is the auto-ignition temperature for Jet A, and what does it mean? What is the flash-point for Jet A, and what is the difference between flash point and auto-ignition temperature?

Solution

The major difference between Jet A and Jet A-1 is the freezing point.

Freezing points are -40 ^oC for Jet A and -47 ^oC for Jet A-1.

Jet B is useful in very cold climates as it has a very low freezing point of -60 ^oC.

Auto-ignition temperature is the lowest temperature at which the fuel self ignites without an external source of ignition, such as flame or spark.

Flash point is the lowest temperature at which vapors produced from the fuel will ignite, when given an ignition source. The fuel will not burn at this point.

Auto-ignition temperature for Jet A is 210 ^oC.

Flash point for Jet A is 38 ^oC.