How can i create efficiency isolines in a compressor map?
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I have mass flow, pressure ratio and efficiency values of about 30 points for 3 different rotation speed. I need to plot a compressor map as in the link by using these datas: https://www.uniplot.de/_images/metafiles-compressormap-80.png
I used interp1 with spline as method to create constant rotation speed lines (black lines in link above). And now i need to create efficiency isolines. I tried with different commands(for example; contour, griddata) but it did not work so far.
How can i create efficiency isolines?
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Accepted Answer
jonas
on 12 Sep 2018
This is what I'm getting from the data you uploaded.
%%Load data
rpm{1}=xlsread('data_compressor_map.xlsx','A3:D10');
rpm{2}=xlsread('data_compressor_map.xlsx','A14:D25');
rpm{3}=xlsread('data_compressor_map.xlsx','A29:D33');
data=vertcat(rpm{:});
x=data(:,2)
y=data(:,4)
z=data(:,3)
%%Interpolate on grid
[X,Y]=meshgrid(min(x):.01:max(x),min(y):.01:max(y))
Z=griddata(x,y,z,X,Y)
%%Plot contour
contourf(X,Y,Z);hold on
%%Plot lines
plot([x(1:8);NaN;x(9:20);NaN;x(21:end)],[y(1:8);NaN;y(9:20);NaN;y(21:end)],'-k','linewidth',2)
cb=colorbar
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