Studies on the flame curvature effect on burning velocity

Takeshi Yokomori, Zheng Chen, Yiguang Ju

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The curvature effect on the burning velocity of highly curved flames has been investigated numerically and theoretically. The cylindrical flame was used and compared with the counterflow flame to extract the curvature effect. The numerical simulation with detailed chemistry for hydrogen/air, methane/air, and propane/air flames showed that the burning velocity was significantly affected by the flame curvature in addition to the flame stretch. This curvature effect increased the burning velocity for mixtures with Le < 1, but decreased the burning velocity for mixtures with Le > 1, and only had little effect for mixtures with Le ∼ 1. In the conventional burning velocity relation derived from the assumptions of small flame curvature and thin flame thickness, this curvature effect has not included. Therefore, the asymptotic analysis without such assumptions was performed to further investigate this additional curvature effect. The analytical results also showed the flame curvature effect and qualitatively agreed with the numerical simulations. This agreement implies that the conventional burning velocity relation missed this additional curvature effect and that this curvature effect was caused by the thermal-diffusive transport dependence on the sub-coordinate location in the flame zone.

Original languageEnglish
Title of host publicationCollection of Technical Papers - 44th AIAA Aerospace Sciences Meeting
Pages1947-1952
Number of pages6
Volume3
Publication statusPublished - 2006
Externally publishedYes
Event44th AIAA Aerospace Sciences Meeting 2006 - Reno, NV, United States
Duration: 2006 Jan 92006 Jan 12

Other

Other44th AIAA Aerospace Sciences Meeting 2006
CountryUnited States
CityReno, NV
Period06/1/906/1/12

Fingerprint

curvature
flames
Air
Asymptotic analysis
Computer simulation
Propane
air
Methane
effect
Hydrogen
counterflow
propane
simulation
methane
hydrogen
chemistry

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering

Cite this

Yokomori, T., Chen, Z., & Ju, Y. (2006). Studies on the flame curvature effect on burning velocity. In Collection of Technical Papers - 44th AIAA Aerospace Sciences Meeting (Vol. 3, pp. 1947-1952)

Studies on the flame curvature effect on burning velocity. / Yokomori, Takeshi; Chen, Zheng; Ju, Yiguang.

Collection of Technical Papers - 44th AIAA Aerospace Sciences Meeting. Vol. 3 2006. p. 1947-1952.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Yokomori, T, Chen, Z & Ju, Y 2006, Studies on the flame curvature effect on burning velocity. in Collection of Technical Papers - 44th AIAA Aerospace Sciences Meeting. vol. 3, pp. 1947-1952, 44th AIAA Aerospace Sciences Meeting 2006, Reno, NV, United States, 06/1/9.
Yokomori T, Chen Z, Ju Y. Studies on the flame curvature effect on burning velocity. In Collection of Technical Papers - 44th AIAA Aerospace Sciences Meeting. Vol. 3. 2006. p. 1947-1952
Yokomori, Takeshi ; Chen, Zheng ; Ju, Yiguang. / Studies on the flame curvature effect on burning velocity. Collection of Technical Papers - 44th AIAA Aerospace Sciences Meeting. Vol. 3 2006. pp. 1947-1952
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