Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9759213 | International Journal of Hydrogen Energy | 2005 | 9 Pages |
Abstract
A series of tests were conducted to investigate how difficult lean hydrogen-air mixtures (4-10% hydrogen concentration) are to ignite. The commonly reported lean limit of combustion for hydrogen is 4.0%. The tests that were used to determine this assumed a quiescent hydrogen-air mixture and no upper limit on ignition energy or gap size for ignition. In this work, ignition tests were conducted with: (1) quiescent hydrogen-air mixtures and ignition arc lengths up to 3.2Â mm (0.126Â in), (2) mixtures in motion and arc lengths up to 1.5Â mm (0.060Â in), and (3) low-velocity mixtures with common electrical appliances as ignition sources. This work showed that the probability of igniting lean hydrogen-air mixtures is strongly affected by the ignition source, where successful ignition was a strong function of arc length and a weaker function of gas velocity and ignition energy. The tests were conducted at 26-27âC (78-80âF).
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
M.R. Swain, P.A. Filoso, M.N. Swain,