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speed leads the flow, which is caused by fluid inertia in the entire flow loop system. The fluid inertia in the flow loop is most likely more than would be found in a rocket engine. Curve 9 shows that the flow is being 'pulled' through the inducer because the speed ratio is greater than the steady-state value. The discharge heads, Curves 2 and 3, are consistant with the speed and flow at any given point. This indicates that a start transient model can use a quasi steady-state technique as described in Ref 3. Figures 60 through 62 show the conventional inducer during cavitating start transients at different flows and times. For the 3-sec starts, the rotor has reached 100%speed before the inducer starts to rotate. The flow rate is almost zero until this time. This meansthat the rotor is completely cavitated out (maximumspeed with near zero inlet head) and one could expect that flow would not start. Apparently there is enoughfluid shear drag between the rotor and the inducer - hydraulic turbine that rotation is initiated. Whenthe inducer does rotate and generates NPSHfor the rotor, rotor begins to generate head which, in turn, initiates flow. The NPSHshownon Figure 61 is reduced to 4.5 ft (1.7 m) at 5.25 sec. This is equivalent to a boost pumpsuction specific speed of 85,000 (31.0) which approaches the maximumcapability of 92,000 (33.6) as discussed in the previous section. As indicated by Figure 58, this would be at considerable head loss but recovery was possible, as can be seen by Figure 61, Curve 3. A typical shutdown is shown in Figure 63. This particular shutdown occurred at nearly constant specific speed, as indicated in Curve 8. The inducer speed returns to zero faster than the rotor, causing both the speed ratio and the flow/speed parameter, Curves 7 and 9, respectively, to go to an infinite value. 2. Hub less Inducer The boost pump, with the 45 ° hubless inducer, transient non- cavitating performance at the design flow coefficient is shown in Figure 64. The inlet NPSH was set high enough to preclude cavitation (see Curve i). There is little or no difference between the non-cavitating transient performance of the boost pump with the hubless inducer and that of the conventional inducer. Since the shroud drag torque was approximately 40% of the total torque delivered by the hydraulic turbine, the effect of difference in inducer torques was minimized. Locked speed ratio therefore occurred in the same time regardless of inducer configuration. Figures 65 through 67 show the cavitating transient performance of the hubless inducer at different flow coefficients and elapsed times. The inlet NPSH had to be increased from i0 ft (3.05 m), the minimum value used on the conventional inducer, to 26 ft (7.95 m) at design flow and 16 ft (4.88 m) at 80% flow because the hubless inducer would not start at the lower NPSH value. 83PDF Image | HUBLESS INDUCER FLOW HYDRAULIC TURBINE INDUCER BOOST PUMP
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