Bernoulli and 350 ft/s, 146 cfm/in²

74 Cuda said

I'm definitely no expert here but i believe you're trying to compare apples to oranges.
From your first post.."That's how velocities in certain areas of the port can exceed 350.3 average." "Certain areas" of the port are local velocities not average. Using your pitot probe at the curtain area you're measuring the local velocity. Great job on all the math

Click to expand...

You are correct that the pitot measures local velocity. If we are trying to measure the average velocity in the curtain area, then taking multiple measurements around the entire perimeter of the valve and averaging them together will give the average velocity. That’s what the section highlighted in pink shows. In this example, 16 pitot measurements were taken with the valve at 0.200 lift. The average of those measurements is 370 ft per sec.

My point was this: The mass flow rate through the port cannot change; it must be a constant. The average flow (measured in acfm) can change locally as the density changes. The average flow in scfm will not change throughout the length of the port. The actual local velocity can be higher than 350 ft/sec. The average velocity converted back to standard conditions cannot exceed 350.

This post was edited to clean up the language.