To start this thread heres a quote from Larry from Colorado. On another
forum we are discussing this clip. I am hoping to get more opinions on
what this tells us.
Quote:
"This video of combustion taken at 10,000 frames per second, with the
Photron Ultima APX-RS camera Schlieren photography records density
differences so you can clearly see the high temperature areas generated
by combustion process. Schlieren photography only sees changes in density,
much like you see mirage and heat waves on a hot highway. All you can
say with certainty is that the area just above the piston crown is distinctly
different in local density than the fuel air mix a centimeter or so above the
piston crown."
"That said my guess is that the activity that we see in that clip is heat transfer
by conduction from the hot piston crown to the relatively cooler fuel air mix."
Schlieren combustion
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In the combustion clip, focus on the activity above the piston surface as it
approaches the cylinder head. First thoughts are this is related to heat
transfer from the piston crown. The cylinder head temperature should be near
the same (possibly lower with heat transfer to the water jackets) yet the
activity is only seen above the piston. Could there be more? Is it possible
that this activity is kinetic energy that is being transmitted into the
mixture as the piston displaces the fluid during compression?
Here's some screen shots from the clip.
