OCR Text |
Show 20 8\ air intermittency function, unity when material arriving directly from the air port is present at the given point, zero when there is none, 1 8$ intermittency function for the presence of entrained ambient gas material, unity when some is present at the given point, zero when there is none, 1 77 =y\ld\2, dimensionless lateral position on the fuel jet trajectory, m r]m value of 77 at the crest of the fuel-jet trajectory, where dnld% = 0, 1 6, = atan(<iy,/dx), local angle between the x axis and the jet trajectory (/ = 1 or 2), rad #i,0 angle between the fuel port axis and the normal to the burner wall, rad b\,o angle between the air port axis and the normal to the burner wall, rad A integral spatial scale of turbulence, m £ = xldn, dimensionless longitudinal position coordinate, m value of £ at the point of confluence of the fuel and air jets, 1 value of £ at the crest of the fuel-jet trajectory, where drjld^ = 0, 1 p density, kg/m3 p^ density of the ambient gas (recirculating combustion products), kg/m3 <j> angular coordinate in cylindrical coordinates, for an axisymmetrical jet with the x axis on the centreline, m y\2 =GXo I G2o, fuel/air source momentum flux ratio, 1 References Becker, H. A., Mixing, concentration fluctuations and marker nephelometry, Studies in Convection, Vol. 2: Measurement, Theory and Applications (B. E. Launder, ed), pp. 45-140, Academic Press, 1977 Becker, H A & Booth, B. D , Mixing in the interaction zone of two free jets, AIChE Jour. 21, 949-958 (1975) Becker, H. A , Hottel, H. C , and Williams, G. C , The nozzle fluid concentration field of the round, turbulent, free jet, J Fluid Mech 30, 285-303 (1967) Becker, H. A., Hottel, E C , and Williams, G. C , O n the light scatter technique for the study of turbulence and mixing, J. Fluid Mech 30, 259-284 (1967) Becker, H. A and Liang, D , Visible length of vertical free turbulent diffusion flames, Combust. Flame 32, 115-137(1978) Becker, H. A. and Sobiesiak, A., Testing of the C G R I burner in the C A G C T furnace, C A G C T Report No. 95.1, Centre for Advanced Gas Combustion Technology, Queen's University, Kingston, Canada K 7 L 3N6, 1995 |