Abstract
The effect of ignition kinetics and fuel chemistry of conventional jet fuels like JP-8, Jet-A, and JP-5 on the detonation length and time scales was studied and compared for applications in detonation-based combustors. The numerical calculations were carried out over a range of initial conditions to evaluate critical detonation responses of interest of real distillate fuels for their application in detonation-based combustors. The effect of the addition of ignition promoters and inert diluents on the ignition kinetics of real distillate fuels was also computed and compared. Results show that the global detonation properties of the three jet fuels are approximately the same under comparable conditions. Also, the length and time scales of real distillate fuels have very small variations under varying initial conditions. Similarly, the addition of ignition promoters shows similar reductions in the chemical length and times scales. The increase in the detonation length and time scales with the addition of inert diluents is also similar for the three jet fuels. For all the cases tested so far, the detonation chemistry and the critical detonation parameters are found to be very close to each other for JP-8, Jet-A, and JP-5. In so far as the global detonation properties are concerned, the three jet fuels tested exhibit nearly the same chemical behaviors and global combustion properties. Additionally, the three jet fuels tested yield nearly the same composition and amounts of pyrolysis products under comparable conditions. It is found that the pyrolysis product distribution determines the global detonation properties of the original, multicomponent jet fuels.
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Abbreviations
- Δi :
-
Induction zone length (mm)
- τi :
-
Induction delay time (μs)
- \(\dot{\upsigma }\) :
-
Thermicity
- T 0 :
-
Initial temperature (K)
- P 0 :
-
Initial pressure (atm)
- a 0 :
-
Upstream speed of sound (m/s)
- φ:
-
Equivalence ratio
- P CJ :
-
Post-detonation pressure (atm)
- T CJ :
-
Post-detonation temperature (K)
- M CJ :
-
CJ detonation Mach number
- V CJ :
-
CJ detonation velocity (m/s)
- P VN :
-
Post-shock pressure (atm)
- T VN :
-
Post-shock temperature (K)
- VN:
-
Von Neumann state
- CJ:
-
Chapman–Jouguet state
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Acknowledgements
The authors acknowledge the financial support for this work from the Aeronautics R&D Board, Ministry of Defence, Govt. of India vide Sanction Letter # ARDB/01/1042000M/I.
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Iyer, M.S.K., Dahake, A. & Singh, A.V. Comparative Studies on Ignition Kinetics and Detonation Chemistry of Real Distillate Fuels. Trans Indian Natl. Acad. Eng. 7, 823–834 (2022). https://doi.org/10.1007/s41403-022-00331-5
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DOI: https://doi.org/10.1007/s41403-022-00331-5