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NG LOW-SPEED INDUCER I C Inducer Inlet ComDliance e effect of increasing the inducer inlet compliance on system frequency response characteristics is shown in Fi ures 41 and 43 ; the dashed curwes represent a compliance value of 2 in2 and the solid curves rep- resent the reference compliance of 0.025 in2 is lowered to approximately 3Hz; the gain is significantly decreased above approximately 4 Hz, and more phase s h i f t i s evident f o r nearly all frequencies in the range considered. Dynamic testing of pumps and a low-speed inducer has shown that the inlet compliance varies with NPSH (net positive suction head); the compliance increasing w i t h decreasing NPSH. Therefore, feed line frequencies can be controlled somewhat by control of NPSH, It must be remembered that the frequency is also dependent on the inlet line fluid inertia and, in some cases, the inlet duct mechanical compliance, in addition to the fluid compliance. To date, no correlation has been found between compliance-NPSH functions for different turbopumps. Todetermine this relationship, a carefully controlled series of tests including the pump and low-speed inducer would be required. Inducer Fluid ltnertance Figures 43 and 44 show the effects on gain and phase shift dueto increasing the ine imcer.of the fluid in the inducer, The dashed curves represent an inertance value of 0.25 sec2/in2 and the solid curves represent the reference inertance of 0.04 sec2/in2a educes the gain for frequencies above approximately 1Hz,and increases the phase shift up to about 20Hz, The fluid inertance is generally difficult to determine and values used for the turbopump were derived from test data. e The inlet line resonance The increased in- 78PDF Image | New and Innovative Product
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