High Pressure Compressor output
Hi,
Refreshing myself on the workings of a High Bypass Engine when it occurred to me I know very little about what the hi-pres compressor is actually doing. For instance on the CFM-56 engine used in the 737-800, 80% of thrust is being generated by the low-pres compressor and turbine assembly (N1). Is the primary function of the hi-pres compressor and turbine assembly to augment the total thrust output or is it also used to pressurise the cabin and various other functions?