Port velocity average target fps?
Maybe you have an amazing insightful point beyond the obvious direction that your questions are leading to, but I'm betting you don't.
It's always the same game, it never goes anywhere.
To get an average fps air speed you can take the flow rate in cfm, divide by 60 to get per second and then divide by the csa in sq ft. There's 144sq in per sq ft.
So if you have 300cfm and a 2.0sq-in port, you have 5 cfs (300/60 = 5) and .014 sq ft of port (2/144 = .014).
5/.014 = 357 ft/s. Obviously I just made up the numbers, but the same can be done with any data.
This is just rule of thumb of course, but it will hold at any given cross sectional area. There will be local high and low velocities of course, caused by the interaction of the boundary layer and wall inflection.
When the area increases velocity decreases. Velocity and pressure are related, p1v1 = p2v2 (all other things equal), when velocity is reduced the pressure goes up which can cause vapors to condense. This is one of the reasons water boils eaiser at higher elevations. There is some chemistry happening too since evaporation of the fuel will cool the air and also increase the density. This can either increase velocity or pressure depending on port geometry and the Mach # of the flow.
Bernoulli is a lot more complex than this, and when you take all the variables into account and keep the units matching it should be possible to calculate general ranges for a lot of parameters. If you can get real world data and compare it can give a bunch of insight.
