Compressor Map with Scattered Lookup

This example shows gas flow through a compressor which is modeled using a simple controlled mass flow rate source. The compressor map that governs this mass flow rate is modeled using the PS Scattered Lookup (2D) block whose data coordinates are the pressure ratio (Pa/Pa) and the engine RPM, and the output is the mass flow rate (kg/s). The scattered lookup block performs delaunay triangulation on the input data (which is shown in plots below), and uses this to interpolate and calculate the mass flow rate based on the input. Scattered lookup allows modeling of the compressor even if the data provided is in an unstructured format.

A sample compressor map is shown in the figure. For this example, one can choose any set of points along the various RPM lines as input data points for the PS Scattered Lookup block. The first coordinate is the pressure ratio and the second coordinate is the RPM value. The function value is the corresponding value of the mass flow rate.