Heat transfer and combustion characteristics of an array of radial jet reattachment flames

Abstract Radial Jet Reattachment Combustion (RJRC) nozzle provided improved fuel/air mixing for use in impingement flame heating. Detailed heat transfer and combustion measurements are conducted to characterize the performance of the RJRC nozzles in an array configuration. The measurements indicated that the RJRC flames produce low NO x and CO emissions. However, their characteristics are highly dependent upon the between-nozzle spacing. At a small spacing, because of the high interaction among the RJRC nozzles, the sub-atmospheric region above the center nozzle vanishes, resulting in a large elliptic flame. In a moderately interactive spacing, high surface heat fluxes are achieved, while at a large spacing, the RJRC flames operate almost independently from each other.