Design Report Guided Missile Submarine SSG(X) - AOE - Virginia ...

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SSG(X) Design – VT Team 3 Page 72 For the optimization, initial estimates were made for the Expanded Area Ratio (EAR), Pitch to Diameter Ratio and propeller diameter (DP). Using the Wageningen B Series, POP optimizes all these values. The wake fraction is updated using the optimized DP. The optimization is redone with the new wake fraction. This iteration process is performed until DP does not change. During the optimization process, 7-bladed propellers were found to be the most efficient. The optimization results were used to evaluate the snorkel and sprint conditions to ensure the efficiencies satisfied the ORD and that the propeller does not cavitate. The POP program uses Burrill’s Simple Cavitation Diagram, shown in Figure 65; this is a plot of the mean thrust loading against the local cavitation number. To keep the signatures as small as possible, a strict 5% Burrill back cavitation criteria is used. If the propeller violates the cavitation criteria, the POP program gives a warning and changes must be made. The most effective change is a decrease of P/D. Figure 65 - Burrill's Simple Cavitation Diagram [Principles of Naval Architecture] The iteration process is repeated until all ORD efficiencies are satisfied and the propeller does not cavitate during snorkel and sprint. The snorkel resistance calculation included a wave induced drag while snorkeling, which the original model did not include. Because of this the snorkel endurance did not satisfy the ORD requirement. To meet this requirement, 40 ltons of diesel fuel were added to the baseline design. Figure 66 and Figure 67 show the propeller curves for AIP endurance and AIP sprint respectively. Figure 68 shows the propeller curves for snorkel endurance. Figure 66 - Propeller Curves for AIP Endurance (5 knt)
SSG(X) Design – VT Team 3 Page 73 Figure 67 - Propeller Curves for AIP Sprint (22 knt) Figure 68 - Propeller Curves for Snorkel Endurance (12 knt) The propeller characteristics after optimization are summarized in Table 46. The propeller is 7-bladed with a diameter of 4.5 m. Table 47 summarizes the propeller performance characteristics at AIP endurance, sprint and snorkel speeds. Table 46 - Summary of Optimized Propeller Characteristics Description Optimization Result P/D 1.40 Pitch (P) 6.30 m EAR 1.01 # Blades 7 DP 4.5 m Wake Fraction 0.20
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