543
Views
23
CrossRef citations to date
0
Altmetric
Original Articles

Laminar Burning Characteristics of Diluted n-Butanol/Air Mixtures

, &
Pages 1360-1375 | Received 23 Dec 2010, Accepted 22 Jun 2011, Published online: 11 Nov 2011
 

Abstract

Experimental and numerical studies on laminar burning characteristics of diluted n-butanol/air premixed mixtures were conducted. Experiments were conducted using the spherically expanding flames at different dilution ratios of nitrogen at the initial pressure of 0.1 MPa and temperature of 428 K. Both measured and computed results show that with the increase of dilution ratio of nitrogen, the laminar flame speed of n-butanol/air mixtures is decreased. This is attributed to the decrease of adiabatic flame temperature of the mixtures. In addition, effective Lewis numbers of n-butanol/air mixtures at varied dilution ratios were deduced, and flame instability was analyzed. Results show that in the case of equivalence ratio less than 1.4, flame tends to stabilize with nitrogen dilution for the n-butanol/air mixture. In contrast, in the case of equivalence ratio equals to and larger than 1.4, the flame tends to become unstabilized when mixtures are diluted with nitrogen. The measured laminar flame speeds are in good agreement with the computed laminar flame speeds at different nitrogen dilution ratios. Results show a linear relationship between the normalized laminar flame speed and nitrogen dilution ratio. Sensitivity analysis was conducted using the recently developed detailed kinetic mechanism. Results indicate that the three-body reactions are dominant at large dilution ratio.

ACKNOWLEDGMENT

The study is supported by the National Natural Science Foundation of China (50636040, 50821064).

Reprints and Corporate Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

To request a reprint or corporate permissions for this article, please click on the relevant link below:

Academic Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

Obtain permissions instantly via Rightslink by clicking on the button below:

If you are unable to obtain permissions via Rightslink, please complete and submit this Permissions form. For more information, please visit our Permissions help page.