THERMAL AND CONCENTRATION FIELDS OF BURNER-ATTACHED JET FLAMES IN CROSS-FLOW

The thermal and concentration structures of the burner-attached jet fl ames in cross Row were experimentally studied. Due to the complex inte raction among the cross air flow, issuing fuel jet, and burner tube, t he flame behavior in the area around the burner tip was characterized by several modes for different ranges of jet-to-wind momentum flux rat io. The temperature and concentration profiles of the flames of the di fferent characteristic modes presented drastic variations. At low jet- to-wind momentum flux ratios, the downwash flame anchored behind the b urner tube. The temperature profiles of the downwash flame near the bu rner tip were characterized by two side peaks and a center deep. At mi d jet-to-wind momentum flux ratios, a center hump presented in the tem perature profile. At high jet-to-wind momentum flux ratios, the downwa sh flame disappeared. The flame existed in the lee side of the issuing fuel jet body and was characterized by two side peaks and a center de ep, although the deep was shallow. The temperature variation near the burner tip occurring prior to the blowoff of the flame was discussed. The concentration profiles of CO, CO2, and O-2 illustrated the effects of mixing in different characteristic flame modes. The complex charac teristics of the temperature and concentration fields suggested that t he conventionally used diffusion flame model for the liftable jet flam e in cross flow was not adequate for the burner-attached jet flame in cross flow.