Quote:
Originally Posted by Occasionally6
If you can't find any you are not looking. Every discussion of the flow across an exhaust valve covers sonic flow on blow down.
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Hi Occasionally6,
I've been watching this discussion, it looks like a fine example of the Dunning–Kruger effect.
But to help out - this:
Internal Combustion Engine Fundamentals by John Heywood, page 225 in my copy. He even mentions choked flow for intake valves!
But here are two excerpts, one from chapter 6 Gas Exchange Processes
and the other from appendix C.
Everybody knows this, so I thought a discussion of it being just theoretical was amazing.
Now Heywood never says supersonic, or even sonic, he says "velocity of sound" or sometime Mach = 1. In my experience, and probably yours too, when an engineer says "supersonic" they mean speed of sound or higher. Only pedants say sonic - sorry, I see you just did.
-mort