Quote:
Originally Posted by Dimman
Question regarding some language in that book.
In the context of exhaust gas velocity and this formula:
Gas Speed = Piston Speed X (D^2 / d^2)
D= dia of bore
d= dia of port
This is under the condition of "When the coefficient of flow is unity."
What does that mean "coefficient of flow is unity"?
Is it something to do with pressure differentials or something?
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I believe "unity" in this case means constant. Unity can be defined as "unvaried", and therefore can be said to be constant.
I'm sure for the formula to work, you have to hold the coefficient constant, otherwise there are too many unknowns.
Coefficent of flow = fluid friction, or "the resistance to flow", in layman terms.