Respuesta :
Upon inspection of the spark plugs in an aircraft engine, the plugs were found caked with a heavy black soot. This indicates a rich mixture.
How the black soot get deposited in aircraft engines?
- Raw fuel and oil build up on the electrodes and nose insulator of a spark plug every time it doesn't ignite.
- These issues are almost always caused by an incorrect idle mixture adjustment, a leaking primer, or carburetor issues that result in an excessively rich idle mixture.
- When the idle fuel-air mixture is skewed to optimal power, soot or black smoke flowing from the exhaust and an increase in rpm are signs of a rich fuel-air mixture.
- Due to the lack of turbulence and engine heat, soot that develops as a result of excessively rich fuel-air combinations accumulates on the interior of the combustion chamber.
- However, the soot is swept away and does not condense out of the charge in the combustion chamber at higher engine speeds and powers.
Learn more about the aircraft engine with the help of the given link:
https://brainly.com/question/5596396
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