.ThermoPower.Gas.Turbine

Information

The performance characteristics are described by two characteristic equations: the first relates the flow number phic, the pressure ratio PR and the referred speed N_T; the second relates the efficiency eta, the flow number phic, and the referred speed N_T [1].

The performance maps are tabulated into two differents tables, tablePhic and tableEta which express phic and eta as a function of N_T and PR respectively, where N_T represents the first row and PR the first column [2]. The referred speed N_T is defined as a percentage of the design referred speed.

The Modelica.Blocks.Tables.CombiTable2D interpolates the tables to obtain values of referred flow and efficiency at given levels of referred speed.

Modelling options

The following options are available to determine how the table is defined:

• 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. S. L. Dixon: Fluid mechanics, thermodynamics of turbomachinery, Oxford, Pergamon press, 1966, pp. 213.
2. P. P. Walsh, P. Fletcher: Gas Turbine Performance, 2nd ed., Oxford, Blackwell, 2004, pp. 646.

Revisions

• 13 Apr 2005 by Francesco Casella:
  New method for calculating performance parameters using tables.
• 14 Jan 2005 by Francesco Casella:
  Adapted to Modelica.Media.

Turbine model restructured using inheritance.
• 5 Mar 2004 by Francesco Casella:
  First release.