packageExercise5TurboChargedDieselEngine

Information

This package contains examples of a turbocharged diesel engine cycle.

The examples use the SimpleAir medium model (perfect gas with constant cp) and the process model PolytropicPerfectGas. They differ by the system specification (Cycle and Flow) and by the solution method: implicit nonlinear equations vs. pseudoInversion "controllers".

English problem description

A stationary flow process with a diesel engine operating at a rotational speed of n = 2000 rpm is considered. The four-stroke engine with z = 6 cylinders is equipped with a turbocharger and intercooler to increase power output.

Ambient air at state 1 (300 K, 1.00 bar) is compressed in the reversible adiabatic compressor to 1.23 bar, and then cooled isobarically in the cooler to 300 K.

In the engine block, the air undergoes an idealized Diesel process: starting from the bottom dead center of the piston, it is first compressed isentropically to 80.62 bar (engineCompression), then heated isobarically to 1700 K (combustion), and finally expanded isentropically back to the bottom dead center (engineExpansion, state 6). The maximum volume of a single cylinder at the bottom dead center is 2500 cm3.

The exhaust gas from the diesel engine is throttled in the adiabatic valve and expanded in the adiabatic, frictional turbine to ambient pressure. The turbine delivers its power completely to the compressor via a lossless shaft.

Contents

Name	Description
Cycle	Turbocharged diesel engine
Flow	Turbocharged diesel engine
CyclePseudoInversion	Turbocharged diesel engine
BaseModel	Defines the parameters

Revisions

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