Factors affecting fresh mixture entrainment in bluff-body stabilized flames
✍ Scribed by A.H. Lefebvre; A.R.A.F. Ibrahim; N.C. Benson
- Publisher
- Elsevier Science
- Year
- 1966
- Tongue
- English
- Weight
- 497 KB
- Volume
- 10
- Category
- Article
- ISSN
- 0010-2180
No coin nor oath required. For personal study only.
✦ Synopsis
R#¢elvt' (I Deambcr 19631 revl,ta Ftbruatv 19~ An expeomental and theoretical investigation has been ¢~vvied out on tlJe effects ol air ~elocity and temperature, and stabilizer size and blochage, on the amount o/link mixture entrained in th~ rec#culation ~on~ o/# stabilized l~ame. Dirgct ~neasuremen¢ o/the entrainment quantity was sot possible, and it was deaided therelore to derive it by measuring the ]~el l~ow at weah extinction of the flame. Witl~ a knowledge o I the extinction [uel/air ratio, a value could then be [ound /or the quantity o/ air participatin& in comb~dstion a,itnin the, ~ecireutation zone. Tests wer~ carried out at uarious values o] gas temperature and velocity, using ttlree circular pipes o[ four, five and six inches diameter, in conjunction witlJ l~/teen conical stabill. zers, each ot 30" included angle. Values ol stabiliur blockage ranged [tom tl per c~:nt ~o 44 per cent, the actual stabili,er dimensions being specially ~hosen in oMer to pemit baffla size and blockage to be varied indepesde~ltly. The experimental results obtaintcl shomed that the amount o[ ]resh mS#Lure entrained into the re~ir~ulation zone was i~dependent o~ sLabilizer size but increased u'itl, stabitize~ blockage in a manner which agreed with the [redictions o~ a paramete~ derived/mm simple fluid dynamic theory. It was also to~nd that t~e entrainment /me.lion increased with increase in air velocity ane~ dee,'eased with incr,.ase ia u,r temperature.