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Extra info for Electrical Machine Design
Sample text
C or V = absolute velocity, Wsec ( d s ) . D = diameter; unless otherwise subscripted = impeller exit diameter, ft (m). d = diameter, ft (m). Dh = hydraulic diameter of flow passage (= 4AJp), ft (m). F = thrust force, lbf (N). 80665 d s 2 ) at earth sea level. 174 (lbm-ft)/(lbf-sec*). ) &I = set of fluid properties associated with gas-handling phenomena. H = head of liquid column, ft (m) (Eq. 3); can also have the same meaning as the change in head AH (that is, the same meaning as “pump h ead ) .
H. Anderson7 has quantified Eq. 43 for such machines. P 5 ' 60 50 40 30 20 10 0 x10' N,, Specific S p d , (Qm)x iaO = 2733 x n, (AH(fl)]"4 FIGURE 10 Efficiency a t the BEP of centrifugal pumps versus specific speed, size, and shape-adapted from Anderson7 for X = 1 Note: Actual experience for Ns > 2286 shows higher efficiency, as indicated by the dashed line. 227x gpm. The results are given by Eq. ) +m) Eq. Included is a correction for specific speed that is too conservative for N,,,,, > 2286 or a,greater than about unity.
Rb = radial distance from axis of rotation to center of circle defining impeller passage width, R (m) (Figures 13 and 25). ) s = width of gap between impeller disk and adjacent casing wall, ft (m). S = N,,, suction specific speed in rpm, gpm, R units (Eq. 42). sp. gr. 6“C). (S)= set of flow properties associated with solids in the pumpage T = axial thrust, lbf (N). T or T or M = torque, lbf-R (N-m). T = temperature, O F or “R (“Cor OK). ATc = temperature rise due to compression, “F(“C). t = time, sec (9).