DC8FriendShip From United States of America, joined Apr 2005, 242 posts, RR: 3 Reply 2, posted (7 years 8 months 1 day 20 hours ago) and read 3363 times:
Interesting. I didn't know compressor surges shot flames out the front. Seems like the engine would have a massive overtemp condition.
Airfoilsguy From , joined Dec 1969, posts, RR: Reply 3, posted (7 years 8 months 1 day 14 hours ago) and read 3264 times:
I hate to say it but the photo looks like a fake. First off there is no fire coming out the exhaust. Second, in order for that much flame to blow out the intake at speed you would need a massive explosion, in the end bringing down the plane.
Fr8mech From United States of America, joined Sep 2005, 4345 posts, RR: 12 Reply 4, posted (7 years 8 months 1 day 13 hours ago) and read 3250 times:
I won't comment as to whether this photo is a fake or not, but flames out the front of engine are common during a stall, especially low-bypass engines.
I've seen of plenty of times on the old JT8's installed on the B727. Made a couple stall myself.
The flame is not the result of an explosion, it is the result of the flame front traveling forward through the engine after the airflow through/around the compressor has been disturbed.
Dash 80 From United States of America, joined Nov 2001, 309 posts, RR: 2 Reply 5, posted (7 years 8 months 1 day 13 hours ago) and read 3241 times:
Fr8mech is right. The so called "stall" of airflow through the compressor allows hot gasses from the combustor to travel right out the front of the engine. A normal stable flow of air makes the gasses travel out through the rear of the engine. The overtemp problem is an issue as these conditions were not intended for the compressor and can cause suitable damage to the engine as a whole.
SLCPilot From United States of America, joined Aug 2003, 531 posts, RR: 3 Reply 6, posted (7 years 8 months 13 hours ago) and read 3035 times:
Here's another vote for the picture not being "fake". The following is a quote from a former Thunderbird pilot....
Now, F-100 pilots are accustomed to loud noises. Even in the best of circumstances, the afterburner can ' bang ' pretty hard when it lights off. It's also fairly common for the engine compressor to stall, sometimes forcing a violent cough of rejected air back up the intake. Flame belches out the oval nose--which will definitely wake you up at night--and the shock can kick your feet off the rudder pedals. Any F-100 pilot who hears a loud " BANG ! " automatically thinks, "compressor stall," and unloads the jet to get air traveling down the intake in the right direction.
SO, INSTINCTIVELY, the explosion causes me to relax stick-pressure to unload the airplane. By now, I'm fully into one of those fast-forward mental exercises where seasons compress into seconds, the leaves changing color while you watch. I move the stick forward lethargically, even having time to think, "That's no compressor stall ! ! "
Anyway, you can read the full account of the F-100 beakup here if you want.
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