Experimental study on general correlation of turbulent burning velocity at high pressure

Hideaki Kobayashi, Yasuharu Kawabata, Kaoru Maruta

Research output: Contribution to journalConference articlepeer-review

125 Citations (Scopus)

Abstract

Turbulent burning velocities for lean C2H4-air and C3H8-air mixtures were measured for Bunsen-type turbulent premixed flames stabilized in a high-pressure chamber keeping the chamber pressure constant. The experiments were performed for a pressure range up to 1.0 MPa and for u′/SL range up to 25. The effects of equivalence ratio, Lewis number, and pressure exponent of laminar burning velocity were examined. Results show that for both C2H4-air and C 3H8-air flames, ST/SL increases rapidly with increasing u′/SL, particularly for weak turbulence (u /SL < 1). However, the rate of increase for the C 3H8-air flames was smaller than that for C 2H4-air flames, indicating that flame area increase due to hydrodynamic instability at high pressure was restrained by diffusive-thermal effects because of the larger Lewis number of C3H8-air mixtures. The data for a wider range of u′/SL showed that the u′SL dependence of ST/SL for C 2H4-air flames is almost the same as that for CH 4-air flames reported by Kobayashi et al. within the scattering of the data. On the other hand, ST/SL for C3H 8-air flames showed a smaller ST/SL than in the cases of C2H4-air and CH4-air flames. The verifications of existing correlations between ST/SL, u′/SL, and turbulence Reynolds number, R1, were made to elucidate effects of elevated pressure on turbulent burning velocity and the relationship between these parameters. Results show that the data for our experiments had a similar tendency to the general correlation proposed by Abdel-Gayed et al. on turbulent burning velocity but had a larger S T/SL than the correlation. A 1/4 power law of R 1 was seen for data in u′/SL > 1.0, consistent with the fractal flamelet model of turbulent burning velocity proposed by Gouldin. The best correlation between these parameters derived from the experimental data was ST/SL ∞ [(P/P 0)(u′/SL)]n for the whole range of u′/SL and the exponent, n, is close to 0.4.

Original languageEnglish
Pages (from-to)941-948
Number of pages8
JournalSymposium (International) on Combustion
Volume27
Issue number1
DOIs
Publication statusPublished - 1998 Jan 1
Event27th International Symposium on Combustion - Boulder, CO, United States
Duration: 1998 Aug 21998 Aug 7

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Mechanical Engineering
  • Physical and Theoretical Chemistry
  • Fluid Flow and Transfer Processes

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