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:**

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

*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.

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