Interpreting graphs from isentropic efficiency of a compressor lab

[MattH150197]

Homework Statement

We did a lab experiment for isentropic efficiency of a compressor and was asked to plot the following graphs, change in stagnation pressure across the compressor (∆p0) vs air mass flow rate, and isentropic efficiency vs air mass flow rate. I have plotted the graphs but not sure what they actually represen

Homework Equations

change in stagnation pressure =

+ (ρH2O*g*(h1 - 1/4*(h2+h3+h4+h5))) where m air is air mass flow rate, A3 is area of venture position no.3 and h represents the heights of the manometer tubes.

Air mass flow rate = A3 *

where p23 is the pressure drop in the venturi from position 2 to 3
Isentropic efficiency =

where Tqs is the compressor shaft torque and w is the compressor shaft speed

The Attempt at a Solution

In the image attachment it shows the excel spreadsheet I used to compute these calculations I then put those calculations into a graph which I have also attached but like I said I am not sure what the graphs are actually supposed to represent. Thanks for any help you can offer!

 

[LightHero]

The first graph shows the change in stagnation pressure across the compressor (∆p0) vs air mass flow rate. This graph shows the relationship between the change in stagnation pressure across the compressor and the air mass flow rate, with the change in pressure increasing as the air mass flow rate increases.The second graph shows isentropic efficiency vs air mass flow rate. This graph shows the relationship between the isentropic efficiency of the compressor and the air mass flow rate, with the efficiency decreasing as the air mass flow rate increases.