Validation of a Generic Non-Swirled Multi-Fuel Burner for the Measurement of Flame Stability Limits for Research of Advanced Sustainable Aviation Fuels

Paul Zimmermann (), Julian Bajrami and Friedrich Dinkelacker
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Paul Zimmermann: Institute of Technical Combustion, Leibniz University Hannover, 30823 Garbsen, Germany
Julian Bajrami: Institute of Technical Combustion, Leibniz University Hannover, 30823 Garbsen, Germany
Friedrich Dinkelacker: Institute of Technical Combustion, Leibniz University Hannover, 30823 Garbsen, Germany

Energies, 2023, vol. 16, issue 22, 1-17

Abstract: Future aviation concepts should be both CO 2 -neutral and without other emissions. One approach to reaching both targets is based on sustainably produced synthetic liquid fuels, which may allow very clean, lean premixed prevaporized (LPP) combustion. For that, fuels are needed with much longer ignition delay times and a lower flashback propensity than current jet fuels. We describe an experimental setup to investigate the flashback stability of liquid fuels in a multi-fuel burner. In this work, the measurement procedure and the determination of the experimentally obtained accuracy are in focus with regard to prevaporized and preheated iso-propanol/air flames in an equivalence ratio range of 0.85 to 1.05 involving three preheating levels (573, 673, and 773 K). As the determination of the accurate unburnt gas temperature just ahead of the flame is of strong importance for flashback but not directly possible, a model is implemented to determine it from the measurable quantities. Even with this indirect method, and also regarding the hysteresis of the experimental preheating temperature, it is found that the relevant quantities, namely, measured temperatures, mass flows, and values derived from them, can be determined with accuracy in the range below 1.7%.

Keywords: future aviation concepts; advanced sustainable aviation fuels; lean premixed prevaporized combustion; CO 2 neutral; ultra-low emission; flashback experiments; preheat temperature; experimental accuracy (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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