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Design and simulation of gas burner ejectors
- Source :
- Carbon Resources Conversion, Vol 4, Iss, Pp 28-35 (2021)
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- Ignition within gas burner ejectors can lead to off design conditions and has significant influence on the burner behavior. Thus ignition in the ejector should be prevented. In the present study the influence of combustion reactions on the performance of gas burner injectors is investigated. To investigate if ignition is possible, simulated ignition delay times, using a detailed reaction mechanism, are compared to predicted mean residence times of the gas in the ejector. Gas burner ejectors are designed using one dimensional analytic equations, based on energy and momentum conservation equations and conventional isentropic equations. 1D results are compared to 2D computational fluid dynamics (CFD) simulations, to take into account non-ideal mixing effects along the ejector. Results are validated with experiments with air at room temperature. 1D results show very good agreement not only with CFD simulations for the case of non-reactive flows, but also with performed experiments. It is shown that the assumption of ideal mixing along the ejector and thus the comparison of the ignition delay time to the gas mean residence time, to predict ignition in the ejector, is not valid. Ignition in the ejector is possible, even if the ignition delay time is more than thirty times higher than the mean residence time. In addition to that, it is shown, that ignition and the choice of reaction mechanism have significant influence on the predicted gas burner ejector performance. Thus, the accurate prediction of ignition delay time and the use of a detailed reaction kinetic are mandatory to correctly predict the burner ejector behavior.
- Subjects :
- Materials science
Self-ignition
Reacting jet
020209 energy
Materials Science (miscellaneous)
Mixing (process engineering)
TP1-1185
02 engineering and technology
Computational fluid dynamics
Combustion
Flammability limits
Catalysis
law.invention
020401 chemical engineering
Ejector
Physics::Plasma Physics
law
0202 electrical engineering, electronic engineering, information engineering
Physics::Chemical Physics
0204 chemical engineering
Isentropic process
business.industry
Chemical technology
Process Chemistry and Technology
Injector
Mechanics
Ignition system
Fuel Technology
Combustor
Gas burner
business
Jet pump
Subjects
Details
- ISSN :
- 25889133
- Volume :
- 4
- Database :
- OpenAIRE
- Journal :
- Carbon Resources Conversion
- Accession number :
- edsair.doi.dedup.....eef2337b1dc620f88bd719bd0d8e0fc6
- Full Text :
- https://doi.org/10.1016/j.crcon.2021.01.006