The Jalopy Journal
Discussion in 'The Hokey Ass Message Board' started by Dick Dake, Oct 3, 2007.
That is so dang cool
I did a google search....
SAE Technical Papers
Title: A Visualization Study of Liquid Fuel Distribution and Combustion Inside a Port-Injected Gasoline Engine Under Different Start Conditions
Document Number: 2000-01-0242
Jehad R. Zughyer - Wayne State Univ.
Fu-Quan Zhao - Wayne State Univ.
Ming Chia Lai - Wayne State Univ.
Ki-Sang Lee - Hyundai America Technical Ctr.
High-speed video of combustion processes and cylinder pressure traces were obtained from a single-cylinder, optical-accessible engine with a production four-valve cylinder head to study the mixture formation and flame propagation characteristics at near-stoichiometric start condition. Laser-sheet, Mie- scattering images were collected for liquid droplet distributions inside the cylinder to correlate the mixture formation process with the combustion results. A dual-stream (DS) injector and a quad-stream (QS) injector were used to study the spray dispersion effect on engine starting, under different injection timings, throttle valve positions, engine speeds, and intake temperatures.
It was found that most of the fuel under open-valve injection (OVI) conditions entered the cylinder as droplet mist. A significant part of the fuel droplets hit the far end of the cylinder wall at the exhaust-valve side. Some of the droplets were found to travel toward the squish area at the short side of the intake valves. Images taken just before spark timing showed that significant fraction of the fuel was still in the liquid phase. In contrast, Mie-scattering images did not show significant fuel droplets entering the imaging plane under close-valve injection (CVI) conditions. The combustion video showed that combustion during the early cycles of cold start could be categorized into three phases. The first phase was at those early cycles when most of the injected fuel ended up as liquid film on the chamber walls, with insufficiently vaporized fuel in the mixture to sustain combustion. The second phase started when visible weak flame fronts appeared due to improvement in liquid vaporization process. Diffusion-controlled pockets became obvious at this phase and the in-cylinder pressure increase was also significant. The third phase started when the heat of combustion evaporated most of the liquid fuel and produced an overall-rich mixture that combusted at a higher rate and produced a higher cylinder pressure.
Thats just crazy
No sound? Bum!
I couldnt open that one for some reason. Is this one on utube the same?
Yep thats the same one on youtube.
FARTFIGNEWTONS! That was cool!
Awesome! Love the fire, man!
Even if this is a fake demonstration, it's a good example of how a 4 stroke engine operates (versus a 2 stroke).
This one can't die. Back up top.
Charles Kettering did much the same thing in the '30s for GM & the Ethyl Corporation, as a preliminary to his/their studies on octane, gasoline contents, & high compression engines. The camera equipment wasn't nearly as sophisticated but it got the job done.
Not exactly the kind of engines we're interested in around here, but this animation has some amazing detail. There are some neat shots from inside the engine at the end of the video.
This video may be up everyones alley a little better.
that was pretty cool... always wondered what it MIGHT look like...
Snipe sorry to hear about your stint in the navy... lol... but I liked all you Navy guys cuz you gave fleet marines such as myself a ride everywhere we had to go... so I guess cant say you guys are all that bad.... lol.... I was an 0311 Infantry rifleman and 8152 Fast Co.
I was looking online for the video of Comp Cams spintron. I saw the video when they came here for a tech seminar. You can find the one of the valvesprings online... but the pushrod one was what I was looking for.
Its nuts. The pushrod flexes like a wet noodle. It will make you want to get the thickest, strongest pushrods you can.
If you ever get the opportunity to tour Comp Cams and see their spintron work... its really amazing. It runs off of an electric motor directly on the camshaft of the test engine. There is no crank or rods in the engine. It seriously sounds like the engine is running.
Our tour guide said that exact line on the way in and I called bullshit instantly. I ate crow a few hours later.
The best way to describe it is the NASCAR in-car camera views. That sound... its a 99% valvetrain noise.
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