OCR Text |
Show An A' LJ ro rg rmix K f Kf no n g = = = = = = = = = = = = = = = = = = = = = = -17- Nomenclature cross sectional area of a burner nozzle, ft2 cross sectional area of a gas jet, ft2 actual volume of inspirating air per unit volume of gas, ft3/ft3 air density, Ib/ft3 gas density, Ib /ft3 air-gas mixture density, Ib/ft3 drag coefficient for air entrance and air-gas mixture exit friction factor friction resistance coefficient excess air factor for a regular inspirating burner excess air factor for an inspirating pilot with a long mixture tube pressure drop for a regular inspirating burner, Ib/ft2 pressure drop for an inspirating pilot with a long mixture tube, Ib/ft2 gas jet diameter, ft I burner nozzle diameter, ft gas volume flow rate, scfh gas-air mixture volume flow rate, scfh mixture velocity in a mixture tube, fps gas pressure, psig mixture tube length for a regular inspirating burner, ft mixture tube length for an inspirating pilot with a long mixture tube, ft acceleration of gravity, 32.17 ft/sec2 !¥if = /:;Pf == dimensionless friction pressure drop flp /.0 _ n n=no = dimensionless excess air factor |