Combustion measurements from an impinging radial jet reattachment flame
- Texas A and M Univ., College Station, TX (United States)
A Radial Jet Reattachment (RJR) nozzle forces an air flow to reattach to a surface in a ring-like configuration and then flow outwardly and inwardly. A highly turbulent recirculation region above the nozzle produces high transport properties in the reattachment area and over a large area away from the centerline of reattachment. By introducing natural gas into the recirculation region, a Radial Jet Reattachment Combustion (RJRC) nozzle has demonstrated improved fuel/air mixing for use in impingement flame heating. To characterize the performance of RJRC nozzles, heat transfer, surface temperature, surface pressure, and exhaust gas measurements are reported, and comparisons are made with a conventional co-axial-flowing (Co-Ax) flame impingement nozzle. Total surface heat transfer rates for both nozzles show similar results, with the RJRC nozzle showing slightly better performance. The RJRC nozzle produces a very stable flame with a circumferentially symmetric surface temperature profile and low coefficients of pressure at the surface. In contrast, the Co-Ax nozzle has a less table flame with a non-symmetric surface temperature profile and produces surface pressure more than six times the pressures from the RJRC nozzle. Exhaust gas analysis shows very low production of Co and NO{sub x} for the RJRC nozzle, which also produces very little soot.
- OSTI ID:
- 264395
- Journal Information:
- Combustion and Flame, Journal Name: Combustion and Flame Journal Issue: 1-2 Vol. 106; ISSN CBFMAO; ISSN 0010-2180
- Country of Publication:
- United States
- Language:
- English
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