Combustion Dynamics on video
 

It looks to be a fairly "open" cylinder, with not a lot of quench space, but apparently, someone put a HSC in a cylinder and ran the engine.

From what I've been told, the time that you can see the flames are where they are not properly stratified, and thus, aren't optimal AFR for the given area.

This kind of might give some of us an idea of how things are really taking place in there, for those who can't visualize it.
http://vid87.photobucket.com/albums/...player=offsite

Where's the video?

-soD

There you go.

Cool video!

Very nice vid. Nice find Christ:thumbup:

Look at the fuel burning around the intake valve. Lots of info there!!!!!

fractals
 

I flagged an article about mathematicians working on combustion dynamics utilizing fractals formally only of theoretical interest.I think its MIT doing the research.
Looks like no stone will remain un-turned.
Cool pics! Thanks!

One of them is a video, it just embedded as a pic and a video for some reason. The top one will stream about 30 seconds, in case you didn't watch it. It's very interesting to see the red/orange flame around the valve, noticing how inefficient the combustion is in that area. That appears to be good territory for detonation events to occur.

video
 

Just watched the video.I would have never imagined one could get inside the chamber like that and observe.Wow!
I need to correct myself.
The article about fractals appeared in 1992,in ROAD& TRACK (sorry I don't have the month).
The story comes from SAE Paper# 922242 "Fractal Analysis of Turbulent Premixed Flame Images from SI Engines."

Phil, I'm not sure exactly how they did it, TBH.

In fact, for all I know, that video could be a very elaborate fake. It's kind of hard to discuss any part of it, since it's origins are unknown. I'm really not sure exactly how one would get a camera in there and be able to (safely) view the combustion dynamics first hand, myself, nor am I sure how a camera could withstand the violent combustion waves and heat generated therein.

Most excellent video. Well done! Lots to learn here.

ollie

Hmm,

Where is the Valve Overlap ? Did see any. Is this one of those Octane testing engines ?

overlap
 

I understand that for economy-minded applications,zero overlap would be preferred,so this test engine might have been configured,cam-wise, for that outcome.

It looks like to me that the film is stop way before the exhaust valve is closed, so it looks like there isn't any valve overlap.

Yes, the cycles are stopped before the exhaust valve is closed. If someone wanted to extrapolate, you could determine from the valve speed if there was any overlap based on the CA designation at the bottom left corner of the video.

That designation explains what angle the crank is at relative to center line during each event in a rolling time table.

Really interesting video - I've never seen a video like this. Thank you.