How do I estimate how much air flows through the intake due to engine suction? I read that the intake mass flow ratio (not sure its translated to correct lingo) can be expressed as:

$C_A = \frac{\textrm{airflow through air intake}}{\textrm{air density } \times \textrm{ speed of free flow }\times \textrm{ intake area}}$

A graph of this could look like:



Now my question is two fold:


What is the correct english term for this factor?
How do I estimate how much air flows through the intake due to engine suction.
Okay, to solve this I assumed the atmospahere is ISA and flying at 0ft.
Also that air suction vary linear proportional to mil thrust.

So that airflowThroughAirIntake = factor*thrust

I then did some flight tests to estimate what that factor would be, getting the ratio from the graph at full mil thrust.