Presentation of the exercise

This exercise is primarily intended to illustrate how to calculate adiabatic compressions and expansions. It is centered around the study of a small capacity gas turbine, called micro-turbine. This micro-turbine is an existing machine, used for several applications, including cogeneration.

In session S46En we will give a cogeneration facility example based on this machine.

This exercise is divided into three parts:

Before starting working with Thermoptim, we strongly recommend that you study session S07En_init, which introduces all the concepts which you will be using.

(Session realized on 06/16/11 by Renaud Gicquel)

Thermoptim

Thermoptim

Thermoptim

Comparison with the ideal gas model

This session enabled you to build a realistic model of gas turbine, taking into account the combustion reaction.

You can now compare the results with the previous model (session S21En), where we assumed that the machine was traversed by air, without change in composition.

The following table summarizes the results:

In conclusion, even if the model (IG) is not too wrong, as we dispose of a modeling environment as Thermoptim, it is preferable to build a model as accurate as possible: it is no more difficult and there is no error.

Thermoptim project and diagram files are provided in the attached archive.

Review the summary of session 21En to remember the importance of looking critically at the results provided by a software package, and possibly refer to the note entitled “Model construction and verification methodology” (see link below).