Visible Turbine Flames

[Obi Offiah]

Originally Posted by 18-Wheeler

Good timing for the thread to come back up, I found a video of the Metro starting, and here it is.

YouTube - Starting a Garrett turboprop engine

That's a nice, quick start as well.

Nice video.

Have you seen this one: YouTube - TNA Metro Startup
In both videos after combustor ignition the turbine wheel begins to pulse for some reason. After a few moments the pulsing stops and the turbine wheel glow becomes stable. A few moments later the turbine glow disappears despite the engine still running.
I think part of the reason for this could be associated with temperature spikes which are quite normal during engine start-up, also a the combustor fueling profile (rich start mixture perhaps) could also contribute.

Obi