OCR Text |
Show 19 UXo = 4rnXo I npXoD\, volumetric stream-average discharge speed of the fuel jet, m/s ^2,0 = 4ih2o I np2oD\, volumetric stream-average discharge speed of the air jet, m/s w = w\ + w2, mass fraction fuel and air material in the local mixture, 1 wt mass fraction of a given feed material in the local mixture, i = 1, 2 or 3, 1 w\ mass fraction fuel material in the local mixture, arriving directly from the fuel port, 1 w2 mass fraction air material in the local mixture, arriving directly from the air port, 1 M>3 mass fraction entrained ambient gas material in the local mixture, 1 x coordinate normal to the burner wall in the strong-jet/weak-jet problem, on the air port axis, origin at the wall, m. Coordinate on the line of intersection of the two planes of bilateral symmetry in the problem of Becker & Booth (1975), origin at the centre of the line between the centres-at-exit of the two jets, m xc position x at the point of confluence of the fuel and air jets, m x0 position x at the virtual origin of an axisymmetrical jet with the x axis on the centreline, m y coordinate parallel to the burner wall in the strong-jet/weak-jet problem, in the plane containing the port axes, zero on the air port axis, positive in the direction of the fuel jet, m. Lateral coordinate in the plane of the jet axes in the problem of Becker & Booth (1975), origin on the line of intersection of the two planes of bilateral symmetry, m yt = y,{x), position v o n a jet trajectory, m y\ = yi(x), position y on the fuel jet trajectory, m y\,c =yi(*c), position^ of the point of confluence of the fuel and air jets, m y\,o =.Vi(0), position^ of the centre of the fuel port at exit, m yi =yi(x), position^ on the air jet trajectory, m z coordinate normal to x and y, m p\2 angle between the fuel and air port axes, rad 8 intermittency function , = {1 at moments when a point (x, y, z) is inside the turbulent jet fluid, 0 when it is outside}, 1 8 intermittency factor, the probability that (x, y, z) is inside the turbulent jet fluid, 1 8i any one of the material-specific intermittency functions, / = 1, 2 or 3; 1 8X unit vector in the x direction, 1 6\ unit vector in the j> direction, 1 8\ fuel intermittency function, unity when material arriving directly from the fuel port is present at the given point, zero when there is none, 1 |