Smoke in jet engines is usually from unburnt or partially burnt fuel (or by water injection). … Water injection, while cooling the engine, quenches the flames to an extent, resulting in unburnt fuel, which comes out as smoke. However, aircraft have moved away from water injection, reducing emissions.
Why do some jet engines smoke?
Because the engine core is cooled by the injected water, the combustion chambers aren’t able to burn all of the fuel and water mixture, so some particles of the fuel and water are vented out the engine, which materializes in the form of the characteristic black smoke.
Why do Russian jet engines smoke?
In general, cooler combustion and turbine temperatures lead to incomplete combustion and the formation of soot. A lot of the older engines from the Soviet era used low-cost materials, allowing only cooler temperatures – hence more soot.
What is the smoke coming out of Jets?
Jets leave white trails, or contrails, in their wakes for the same reason you can sometimes see your breath. The hot, humid exhaust from jet engines mixes with the atmosphere, which at high altitude is of much lower vapor pressure and temperature than the exhaust gas.
Why does the B 52 smoke so much?
The B-52 will outfly both the B-1B Lancer and B-2 Spirit stealth bombers, in large part because of plans to fit it with new, powerful, more fuel efficient engines. USAF Boeing B-52 Stratofortress with black smoke from engines after take-off and undercarriage retracting.
Do jet engines smoke?
Smoke in jet engines is usually from unburnt or partially burnt fuel (or by water injection). … Water injection, while cooling the engine, quenches the flames to an extent, resulting in unburnt fuel, which comes out as smoke.
What is the white stuff behind airplanes?
Contrails have been around since the dawn of aviation. The word is short for condensation trails. These contrails happen when humidity and temperature cause the moisture in the air to condense and form what we see as white clouds coming from the back of jet engines.
How long does jet engine last?
Older and smaller jet engines typically have TBOs of 5,000 hours at the most. More modern engines have about 6,000 hours or more. With most business jets accumulating less than 500 hours of flying time a year, the schedule for modern jet engine MRO operations averages about 12 years or more.
Which is better f16 or MiG-29?
Below 200 knots, the MiG-29 has incredible nose-pointing capability down to below 100 knots. The F-16, however, enjoys an advantage in the 200 knot-plus regime. At higher speeds, we can power above them to go to the vertical. And our turn rate is significantly better.
Is water ever injected into a jet engine?
Water injection has been used in both reciprocating and turbine aircraft engines. When used in a turbine engine, the effects are similar, except that normally preventing detonation is not the primary goal. Water is normally injected either at the compressor inlet or in the diffuser just before the combustion chambers.
Why do planes stop in mid air?
1 Answer. Lowering flaps and gear will add significant drag, which causes the plane to decelerate. Your body feels that, but without visual reference to the ground, your brain has no way to know what speed it was traveling before or after that deceleration.
Can planes fly in smoke?
“Commercial airliners fly through mild and moderate smoke without problems in most cases,” aerospace engineer Ben Frank, the founder of aircraft maintenance software company Rotabull, told TripSavvy.
Why do jets fly so high?
The reason aeroplanes fly so high is due to improved fuel efficiency. A jet engine operates more efficiently at higher altitude where the air is much thinner, allowing an aircraft to travel faster whilst at the same time, burning less fuel.
What is the oldest B-52 still in service?
The first B-52 arrived in June 1955 and the last in October 1962. The Air Force now operates 76 of them, with two returning to service from long-term storage at an Arizona facility known as the “boneyard.”
How many B-52 are in the Boneyard?
As of June 2019, 58 are in service, 18 in reserve, and about 12 in long-term storage.
Why does the b52 have 8 engines?
Each B-52 uses eight TF33 engines to fly, which means maintainers spend a lot of time ensuring each engine functions properly. And when more than one engine needs repairs, that entails more work for the personnel that are already performing multiple assessments, Arnold said.