modelPolytropicFlow

Information

Example of an Diesel engine cycle. See TUMExercisesThermodynamicCycles.Exercise4DieselEngine for the problem description.

This example makes use of the following components and settings:

• SimpleAir medium model (ideal gas with R = 287 J/(kg·K) and gamma = 1.40)
• PolytropicPerfectGas process model
• systemSpec = Flow (SystemModel)

This setup is based on the fact that the specific work of a thermodynamic cycle is given by the closed integral in the p–v diagram (pressure - specific volume). Therefore, integrating with respect to volume, p*dv (boundary work as typically transferred in a piston–cylinder system), and integrating with respect to pressure, v*dp (“artificial” shaft work of a dual stationary-flow process), yield the same net cycle work, even though the individual contributions of each process step differ.

Components

Revisions

• 2026, by Raphael Gebhart (raphael.gebhart@dlr.de):
  Initial version.