Using these expressions

 

These are my calculations:-

I must find the mass flow and it must come from the throat conditions where ;  ;  ; ; ; ;

Therefore  and this is ready for Mathcad.  and

 and then

This is enough for plotting a graph of  and of  versus diameter. Using Mathcad.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The plots are shown in graph 13-13 and 13-14. I was able to plot graph 13-9 again.