2

6,500

9,510 (0.600)

3,800 (1158)

1,480 (10.2)

1,312 (0.480)

136 (0.9)

*Notes to this table: Flow rates apply to the pump inlet. RD-170 pump data derived from Sutton62 and Advanced Class boiler feed pump data from Ref. 57. Remaining data derived from Table 1 of Section 9.19.2, NASA reports63,64 and from information supplied by Flowserve Corporation.53

*Notes to this table: Flow rates apply to the pump inlet. RD-170 pump data derived from Sutton62 and Advanced Class boiler feed pump data from Ref. 57. Remaining data derived from Table 1 of Section 9.19.2, NASA reports63,64 and from information supplied by Flowserve Corporation.53

induced stresses in the pump structure that culminated in the domain definition of Figure 32, these phenomena encompass a) blade-vane interactions, b) recirculation, c) anomalous axial thrust behavior, and d) cavitation.

In order to illustrate the methods for dealing with the problems created by these fluid/structure interactions, a sample suction stage of a high-energy multistage pump is utilized as the quantifying focus in each case. Table 14 contains the conditions and essential features of this machine, a meridional view of which is shown in Figure 33. As with the earlier design example, this stage has been designed in accordance with the procedures outlined for that example. This includes the velocity diagrams shown in the figure, as well

TABLE 14 Data for high-energy pump suction stage

A. Design Inputs

Rotative speed, N, rpm

Outlet flow coefficient, <|>2 (Figure 12)

Head coefficient, \\i (Figure 12)

Inlet flow coefficient, <|>e

Number of Impeller blades, nb

Number of Diffuser vanes, nv

B. Calculated Perfomance Data

1. Efficiency a) BEP of 20,000 USgpm (1.2618 m3/s)

nhy= 0.900

[216 gpm (0.0136 m /s) front ring leakage; rear ring leakage included in r|hy]

b) At 50% Flow : r|p = 0.693 (= 0.79 of r|BEP ; 0.8 is typical)

2. Head Rise

AHbep =3000 ft. (914 m) => v|/ = 0.455 AHshutoff = 3697 ft. (1127 m) => h/s/o = 0.560

AH-vs-Q curve stability indicator, AHs/0/AHbep= 1.23 (doubtful if less than 1.2)

3. Power

Ps shutoff = 6.144 hp (4,583 kW) ~ P s/0 = 0.0228 (= 0.01966 x 1.16 from Fig. 23)

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