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System uncertainty due to thermo-fluid modelling Konstantinos G. Kyprianidis Figure 4.11: Deviation of combustor outlet temperature for values calculated for no dissociation from chemical equilibrium values for different fluid models used. downstream, can be more than 3% and should not be ignored. Errors in velocity and effective flow area calculations for a high overall pressure ratio (OPR) gas turbine combustor can be as much as 2% and 3% respectively, and should also not be ignored. 4.7.2 Heat addition and expansion calculations As mentioned earlier, ignoring dissociation effects for hot components can result in significant errors in performance calculations. In this section, the errors in heat addition and expansion calculations, caused by ignoring dissociation effects, are discussed. Taking a compressor delivery temperature of 900 [K], combustion calculations were performed for a range of fuel to air ratios, both with and without account- ing for the effects of dissociation. This isolated component study was performed using the fluid models from two commercially available gas turbine performance simulation codes, PROOSIS and GasTurb [24]; both codes use fluid tables pro- duced with CEA [188] to account for dissociation effects and assume full chemical equilibrium. Results from this study are illustrated in Fig. 4.11; consistent data from reference [194] have also been plotted. Wilcock et al. [194] concluded in their study that for combustor outlet tem- 96PDF Image | Multi-disciplinary conceptual design of future jet engine systems
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