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Konstantinos G. Kyprianidis System uncertainty due to thermo-fluid modelling Figure 4.7: Effect of H/C ratio on isobaric heat capacity for combustion products of a weak mixture (left) and a stoichiometric mixture (right). Figure 4.8: Effect of H/C ratio and λ on isobaric heat capacity for combustion products (left) and percentage deviation of isobaric heat capacity values calcu- lated for combustion products of various fuels from Jet-A (right). 4.7. As expected, the effect of H/C ratio is more important as the mixture gets richer. Moreover, when moving from a weak mixture (λ = 3) to a stoichiometric one (λ = 1), Cp will not only become more sensitive to H/C ratio but also to temperature; it can be observed that variation of the value of isobaric heat capacity, for the same range of temperatures (300 [K] to 3000 [K]), rises from 36% for the weak mixture to as much as 44% for the stoichiometric mixture. Some fluid models, based either on tables or polynomials, can only account for combustion products of a particular fuel. For example, the PROOSIS (PRopul- sion Object Oriented SImulation Software) [76–78] standard component fluid model [182] uses caloric property tables for combustion products of Jet-A. Also, some of the polynomials in reference [88] are presented as being suitable for combustion products of kerosene and diesel. As discussed earlier, isobaric heat capacity for combustion products is dependent on the H/C ratio of the fuel used. For fuels with similar H/C ratio, minor deviations would be expected. For fu- els with significantly different H/C ratios the errors should not be ignored, and therefore, for fully rigorous thermodynamic calculations, appropriate tables or 93PDF Image | Multi-disciplinary conceptual design of future jet engine systems
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