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English to Portuguese translations [PRO]
Tech/Engineering - Aerospace / Aviation / Space / aviação | | English term or phrase: mixture setting | Flying at a low altitude also aids engine cooling. This seems backward because air temperature decreases with altitude, so it would seem the cold air of 25,000 feet should cool a piston engine better than the warmer air at 12,000 feet. But die density of the available air is more important to cooling than the actual air temperature because it is the mass, die weight, of the air that absorbs the engine heat. If your turbocharged engine is running too hot, try a lower altitude, where the air is more dense, and you will see cooler operating temperatures.
There is nothing controversial about the above methods to lower engine temps, but when it comes to mixture setting, pilots and experts diverge. Everyone knows that the leaner the fuel-air mixture the higher the temperature of the combustion in the cylinder, "which is measured as exhaust gas temp. However, when die exhaust gas temperature (EGT) reaches its peak and the mixture is leaned further, EGT goes down. The lean of peak (LOP) mixture produces less power and thus less heat.
The controversy about LOP operation is about detonation. At some engine temperatures and power settings, a too-lean mixture can detonate, which is to say explode, inside the cylinder |
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Antonio Tomás Lessa do Amaral
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