%0 Journal Article %1 Rao:1976 %A Rao, K. V. L. %A Lefebvre, A. H. %D 1976 %J Combustion and Flame %K ignition spray %P 1--20 %R 10.1016/0010-2180(76)90002-X %T Minimum ignition energies in flowing kerosine-air mixtures %U http://www.sciencedirect.com/science/article/B6V2B-497SCXV-1N/2/426071a383b2c45a01b77c1bafbd33f4 %V 27 %X Measurements of minimum ignition energy were carried out on kerosine sprays injected into a flowing air stream under conditions of atmospheric pressure and temperature. All the measurements were performed using optimum values of spark duration and with the spark gap adjusted to slightly exceed the quenching distance. Tests were carried out at air velocities up to 50 m/sec on five simplex swirl atomizers designed to produce fuel drops ranging in Sauter Mean Diameter (SMD) from 30 to 100 mum. Ignition was accomplished using capacitance sparks whose energy level could be varied in steps from 3 to 130 mJ. The results obtained clearly demonstrate that by far the most important factor influencing minimum energy is fuel drop size. Ignition performance is improved by increase in spark energy, but very large additional amounts of energy are needed to compensate for even a slight deterioration in atomization quality. It is shown that, for any given atomizer, an increase in velocity can actually improve the weak ignition limit, due to the beneficial effect of velocity on atomization quality. If, however, the fuel drop size is maintained constant, then increase in air velocity has a detrimental effect on the weak ignition limit, in agreement with results obtained on gaseous mixtures.

@article{Rao:1976, abstract = {Measurements of minimum ignition energy were carried out on kerosine sprays injected into a flowing air stream under conditions of atmospheric pressure and temperature. All the measurements were performed using optimum values of spark duration and with the spark gap adjusted to slightly exceed the quenching distance. Tests were carried out at air velocities up to 50 m/sec on five simplex swirl atomizers designed to produce fuel drops ranging in Sauter Mean Diameter (SMD) from 30 to 100 [mu]m. Ignition was accomplished using capacitance sparks whose energy level could be varied in steps from 3 to 130 mJ. The results obtained clearly demonstrate that by far the most important factor influencing minimum energy is fuel drop size. Ignition performance is improved by increase in spark energy, but very large additional amounts of energy are needed to compensate for even a slight deterioration in atomization quality. It is shown that, for any given atomizer, an increase in velocity can actually improve the weak ignition limit, due to the beneficial effect of velocity on atomization quality. If, however, the fuel drop size is maintained constant, then increase in air velocity has a detrimental effect on the weak ignition limit, in agreement with results obtained on gaseous mixtures.}, added-at = {2010-01-05T23:12:10.000+0100}, author = {Rao, K. V. L. and Lefebvre, A. H.}, biburl = {https://www.bibsonomy.org/bibtex/240b9d21d96da207b90c3188218f34b27/sjp}, citeulike-article-id = {598976}, doi = {10.1016/0010-2180(76)90002-X}, interhash = {9700c95d15a739191a30e7725e2ce758}, intrahash = {40b9d21d96da207b90c3188218f34b27}, journal = {Combustion and Flame}, keywords = {ignition spray}, pages = {1--20}, timestamp = {2010-01-19T17:39:44.000+0100}, title = {Minimum ignition energies in flowing kerosine-air mixtures}, url = {http://www.sciencedirect.com/science/article/B6V2B-497SCXV-1N/2/426071a383b2c45a01b77c1bafbd33f4}, volume = 27, year = 1976 }