OCR Text |
Show = 2^ M W , , total mass flux of fuel from all burners in multiburner operation, kg/s #?, or m2, kg/s mass flux of a fuel jet at burner-port exit, kg/s mass flux of an air jet at burner-port exit, kg/s molar mass of air, kg/kmol molar mass of fuel, kg/kmol molar mass of exhaust gas, kg/kmol exponent in the N O x correlation (5), 1 number of fuel ports, and of air ports, in a burner, 1 r\ or r2, m radius of the ring of burner fuel ports, measured at the centres of port exit, m radius of the ring of burner air ports, measured at the centres of port exit, m = Rj(x), effective flame radius, m temperature of combustion air at burner exit, K mean temperature of exhaust gas leaving the furnace combustion chamber (such that mhe is the leaving enthalpy flux, he being the specific enthalpy of the combustion product gases at temperature Te), K refractory surface temperature, K mean y component of velocity, m/s = Gj I rhj, dynamic stream-average jet velocity at port exit, j = 1 or 2, m/s = Am j I TtpjD2, kinematic stream-average jet velocity at port exit, j = 1 or 2, m/s flame volume, m 3 mass fraction fuel in a stochiometric mixture with air, 1 = 1 - w/, mass fraction air in a stoichiometric mixture with fuel, 1 mass fraction fuel material in the local mixture, arriving directly from the fuel port, 1 Wf/wa, stoichiometric mass fuel/air ratio, 1 coordinate normal to the burner wall, with x = 0 at that wall, m position x at the point of confluence of the fuel and air jets in the strong-jet/weak-jet model, m mole fraction of water vapour in gas, 1 mole fraction of species i in gas, 1 27 |