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Oscillations in confined disk-stabilized flames

โœ Scribed by S. Sivasegaram; J.H. Whitelaw

Publisher
Elsevier Science
Year
1987
Tongue
English
Weight
561 KB
Volume
68
Category
Article
ISSN
0010-2180

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โœฆ Synopsis

The flammability and stability limits of confined premixed flames stabilized behind axisymmetric bluff bodies have been established as a function of the length of upstream duct, with and without sudden contractions. Adjustment of the upstream length between a sudden contraction of large area ratio and the flame stabilizer is shown to offer a possible way of suppressing instabilities. Similarly, the careful location of an orifice in an upstream length of straight pipe can suppress instabilities and criteria for the location and diameter of the orifice are given. The relationship between shedding and acoustic frequencies is also examined and appears to be important in the range of equivalence ratios over which transition from stable to unstable combustion takes place.

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