THERMAL SCIENCE

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Experimental investigation of distance between v-gutters on flame stabilization and NOx emissions

ABSTRACT
Blow-off performance and NOx emissions of the propane and air mixture in a rectangular combustion chamber with bluff bodies were investigated experimentally and numerically. The effects of distance between bluff bodies on NOx emissions, the blow-off limit, and exhaust gas temperature were examined. It was observed that NOx emissions are highly dependent on distance between v-gutters. The recirculation zone behind the bluff body expands in width based on the decrease of distance between v-gutters, and expands in length with the increase of inlet velocity. The temperature fields behind the bluff body show a similar change, the temperature behind the bluff body reaches its highest when the distance between v-gutters reaches 20 mm, meaning it has better flame stability. The blow-off limit is significantly improved with the decrease of distance between v-gutters. The blow-off limit is greatly improved by reducing the distance between the v-gutters. Maximum blow-off limit of 0.11 is reached in the case of 20 mm, compared with 0.16 at 50 mm at a speed of 10 m/s.
KEYWORDS
PAPER SUBMITTED: 2018-05-03
PAPER REVISED: 2018-12-06
PAPER ACCEPTED: 2018-12-11
PUBLISHED ONLINE: 2019-01-13
DOI REFERENCE: https://doi.org/10.2298/TSCI180503007U
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