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can be generated either by physical experiments or very detailed calculations. In the case of the T100, the computations were carried out at Volvo Aero Corporation (VAC) AB. The map is generated from a steady state situation for a certain temperature, pressure and speed. In order for the map to clearer present its data, a usual trick is to reduce the number of parameters, by using non-dimensional analysis. This is done in the form of the non-dimensional variables, corrected speed and corrected mass flow. The variables are normalized with the ambient temperature and pressure during the experiment/calculation. For more background on non-dimensional analysis see Fox (1998) and Cohen (1996). The corrected speed and mass flow should also include the diameter D and the gas constant R in order to be dimensionless, but these variables are constant for the compressor, thus they can be neglected. We define: Pressure ratio pr = p2 p1 Corrected mass flow m& corr (5.2.1) (5.2.2) (5.2.3) = m& Corrected speed n = n T1 p1 corr T 1 In the figure below we can see the compressor map plotted from data computed by Volvo Aero Corporation AB. For confidentiality, the axes of the figure are removed and the data rescaled. The characteristic shape of the map is, however, still the same. Compressor map at various speeds High speed Surge line Choke line Low speed Corrected mass flow, mdotcorr = mdot sqrt(T1) / p1 Figure 15: The compressor map generated by Volvo Aero Corporation AB 25 Pressure ratio p2/p1PDF Image | Modelling of Microturbine Systems
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