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According to a journal paper, for a Gnome turboshaft engine, fuel-air equivalence ratio decreases as power output increases. However, for a CFM56 turbofan engine, the opposite trend is true, and equivalence ratio increases as engine thrust increases.

Why is there such a difference between these two types of turbine engines?

Variations of equivalence ratio with power

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  • $\begingroup$ Can you please include (with links) both datasets? $\endgroup$
    – user14897
    Mar 31, 2019 at 17:01
  • $\begingroup$ Thank you. I have added an image of the data set in the question body above. $\endgroup$
    – Mehrdad
    Mar 31, 2019 at 19:54
  • $\begingroup$ Please add the combustion chamber pressure at each data point. I suspect that you need a higher fuel-to-air ratio at low pressure to keep the combustion going, but without those pressure data this is just a guess. Also, besides the number of data points I fail to see the difference between turboshaft 1 and 2 - they have identical numbers. $\endgroup$
    – Peter Kämpf
    Apr 1, 2019 at 18:33

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