Because there would only be enough airflow to cool the engine while the aircraft was flying. When the airplane was on the ground before or after takeoff there would not be enough airflow to cool the engine properly.
Turbine engines are most commonly found in airplanes. They use gas for fuel. They are also known as "jet" engines, hence the term for the plane.
A variation of Aviation Turbine Fuel has always been used in turbine engines. Variations of gasoline have always been used in aircraft with piston engines.
partly clogged fuel nozzels
Aircraft with jet or turbine engines use varities of kerosene.
Reciprocating engines: 100 octane low lead (100LL) Turbine engines: Jet A, basically kerosene.
Aircraft with jet or turbine engines use varities of kerosene.
Gas turbine engines takes in air, compresses it, mix it with fuel, then burns it in combustion chamber. then this expanded gas drives the turbine
Bleed air in gas turbine engines is compressed air taken from within the engine, after the compressor stage(s) and before the fuel is injected in the burner
There are various types/combinations of rocket fuels. The most popular one is Hydrogen which was used by the Space Shuttle. But there are some hydrocarbon fuels as well that are used in rocket engines (for example RP-1 used by the Soyuz rocket). By asking specifically about rocket fuel I assume that you make the distinction between fuel and oxidizer (because a rocket engine generally uses both fuel and oxidizer in contrast with gas turbine engines who takes its oxidizer from atmospheric air). All in all, the answer is not as straight forward as you might expect: certain rocket fuels (see RP-1 like fuels) are very similar to jet fuel so they can be used as fuels in gas turbine engines. Other fuels like hydrogen or hydrazine can't be used in current gas turbine engines. But it is not impossible to have in the future gas turbine engines that uses hydrogen or some other fuels used in rocket engines.
Water bombers usually have turbine engines and they work close to water, so the proper fuel will be jet fuel with the fuel additive Prist, which encapsulates water, in it.
It all depends upon throttle (power) setting, altitude, outside air temperature, air density, the condition of the engine and just exactly what engine it is that is in the jet. A lot of variables in turbine engines. Bottom line is this, turbine engines are Mass Flow engines. Massive amounts of air which means massive amounts of fuel. You won't see me pulling out my credit card to fuel one.
As fuel oil in the boilers of steam-turbine powered ships, perhaps.