Microwave-assisted hydrocarbon flame speed enhancement

S. H. Zaidi, S. O. Macheret, Yiguang Ju, R. B. Miles, D. J. Sullivan, P. C. Efthimion

Research output: Contribution to conferencePaper

6 Citations (Scopus)

Abstract

Long autoignition delay time and low lateral flame propagation speed are among the key problems in developing high-speed combustors for ram/scramjet engines. Plasma-assisted combustion can help to solve these problems. Estimates indicate that uniform volumetric nonequilibrium cold plasma ignition of fuel-air mixtures in ram/scramjet combustors can require large amounts of power to be deposited into the flow. In this paper, we explore a possibility of using microwaves for increase of flame propagation speed, which would be complementary to plasma ignition, allowing the latter to be applied to a smaller volume. The results suggest that the flame propagation speed strongly depends on the Q of the microwave cavity. For high values of Q (∼1000), the input microwave power requirement decreases sharply from kilowatts to hundreds of watts. A 20% increase in the premixed methane-air flame propagation speed was observed for 400 Watt of input microwave power which was operating at 2.45 GHz. It was found that the power absorbed by the flame increases with the increase in the input subcritical microwave power.Theoretical estimations suggest that a small amount of power (on the order 10 W) was absorbed in the flame. These theoretical estimates support the observed experimental data.

Original languageEnglish (US)
Pages9629-9641
Number of pages13
StatePublished - Dec 1 2005
Event43rd AIAA Aerospace Sciences Meeting and Exhibit - Reno, NV, United States
Duration: Jan 10 2005Jan 13 2005

Other

Other43rd AIAA Aerospace Sciences Meeting and Exhibit
CountryUnited States
CityReno, NV
Period1/10/051/13/05

Fingerprint

Hydrocarbons
Microwaves
Combustors
Plasmas
Ignition
Air
Time delay
Methane
Engines

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Zaidi, S. H., Macheret, S. O., Ju, Y., Miles, R. B., Sullivan, D. J., & Efthimion, P. C. (2005). Microwave-assisted hydrocarbon flame speed enhancement. 9629-9641. Paper presented at 43rd AIAA Aerospace Sciences Meeting and Exhibit, Reno, NV, United States.
Zaidi, S. H. ; Macheret, S. O. ; Ju, Yiguang ; Miles, R. B. ; Sullivan, D. J. ; Efthimion, P. C. / Microwave-assisted hydrocarbon flame speed enhancement. Paper presented at 43rd AIAA Aerospace Sciences Meeting and Exhibit, Reno, NV, United States.13 p.
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Zaidi, SH, Macheret, SO, Ju, Y, Miles, RB, Sullivan, DJ & Efthimion, PC 2005, 'Microwave-assisted hydrocarbon flame speed enhancement' Paper presented at 43rd AIAA Aerospace Sciences Meeting and Exhibit, Reno, NV, United States, 1/10/05 - 1/13/05, pp. 9629-9641.

Microwave-assisted hydrocarbon flame speed enhancement. / Zaidi, S. H.; Macheret, S. O.; Ju, Yiguang; Miles, R. B.; Sullivan, D. J.; Efthimion, P. C.

2005. 9629-9641 Paper presented at 43rd AIAA Aerospace Sciences Meeting and Exhibit, Reno, NV, United States.

Research output: Contribution to conferencePaper

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Zaidi SH, Macheret SO, Ju Y, Miles RB, Sullivan DJ, Efthimion PC. Microwave-assisted hydrocarbon flame speed enhancement. 2005. Paper presented at 43rd AIAA Aerospace Sciences Meeting and Exhibit, Reno, NV, United States.