.ThermoPower.Gas.GTunit

Information

Unit performance is a function of two referred quantities, i.e. Zero Loss Power Output referred at ISO conditions (ZLPout_ISO) and referred speed. In typical performance charts, curves corresponding to different referred speeds are labelled by synchronous temperatures (Tsync), i.e. inlet temperatures which would give the same referred speed if the unit operated at nominal rotational speed. The performance is thus specified by three functions[1]:

• HI_ISO = f(ZLPout_ISO, Tsync)
• PR = g(ZLPout_ISO, Tsync)
• wia_ISO = h(ZLPout_ISO, Tsync)

which in turn are specified by three tables, in the format of Modelica.Blocks.Tables.CombiTable2D:

1. tableHI, where ZLPout_ISO is the first column and Tsync the first row
2. tablePR, where ZLPout_ISO is the first column and Tsync the first row
3. tableW, where ZLPout_ISO is the first column and Tsync the first row, respectively.

Modelling options

The following options are available to select the way of definition of the table:

• Table = 0: the table is explicitly supplied as matrix parameter.
• Table = 1: the table is read from a file; the string fileName contains the path to the files where tables are stored, either in ASCII or Matlab binary format.

References:

1. P. P. Walsh, P. Fletcher: Gas Turbine Performance, 2nd ed., Oxford, Blackwell, 2004, pp. 646.

Revisions

• 7 Jun 2005 by Francesco Casella:
  Model restructured by inheritance.
• 19 Apr 2005 by Francesco Casella:
  GT unit model restructured using inheritance.

First release.