Elsevier

Combustion and Flame

Volume 10, Issue 3, September 1966, Pages 231-239
Combustion and Flame

Factors affecting fresh mixture entrainment in bluff-body stabilized flames

https://doi.org/10.1016/0010-2180(66)90079-4Get rights and content

An experimental and theoretical investigation has been carried out on the effects of air velocity and temperature, and stabilizer size and blockage, on the amount of fresh mixture entrained in the recirculation zone of a stabilized flame. Direct measurement of the entrainment quantity was not possible, and it was decided therefore to derive it by measuring the fuel flow at weak extinction of the flame. With a knowledge of the extinction fuel/air ratio, a value could then be found for the quantity of air participating in combustion within the recirculation zone. Tests were carried out at various values of gas temperature and velocity, using three circular pipes of four, five and six inches diameter, in conjunction with fifteen conical stabilizers, each of 30° included angle. Values of stabilizer blockage ranged from 11 per cent to 44 per cent, the actual stabilizer dimensions being specially chosen in order to permit baffle size and blockage to be varied independently. The experimental results obtained showed that the amount of fresh mixture entrained into the recirculation zone was independent of stabilizer size but increased with stabilizer blockage in a manner which agreed with the predictions of a parameter derived from simple fluid dynamic theory. It was also found that the entrainment fraction increased with increase in air velocity and decreased with increase in air temperature.

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  • BensonN.C.
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