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

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SSG(X) Design – VT Team 3 Page 70 Figure 61 - Submerged Bare Hull Resistance versus Speed Figure 62 shows a comparison of the VT and MIT methods for the EHP. There is good agreement between the methods. Figure 63 shows the ship’s EHP curves. Figure 62 - Comparison of VT and MIT Methods Figure 63 – Submerged Effective Horsepower versus Speed
SSG(X) Design – VT Team 3 Page 71 4.5.2 Propeller Optimization Additional calculations provided values for the wake fraction, thrust deduction factor and thrust. Figure 64 shows the calculations for these values. These values were necessary for optimization of the propeller. S Cws := π⋅LOA⋅D w := 1 − .371 − 1.7151⋅ t := 1 − .632 − 1.3766⋅ t := if( t < .17, .17, t) VA := V⋅( 1 − w) RT T := ( 1 − t) ⋅ NP ηH := 1 − t 1 − w Cws = 0.819 D P D P D D LOA Cws⋅ D t = 0.17 ηH = 1.037 LOA Cws⋅ D speed of advance - average wake velocity seen by prop hull efficiency t = 0.112 w = 0.31 EHP THP := ηH wake fraction thrust deduction fraction - prop changes pressure distribution around hull which effectively changes the resistance of towed hull w := if( w > 0.2, 0.2, w) Figure 64 - Calculation of Wake Fraction, Thrust Deduction Factor and Thrust Optimization of the propeller is performed using the Michigan POP (Propeller Optimization Program). The program is based off of the Wageningen B Series propeller curves. The propeller is optimized for AIP endurance and is then evaluated for snorkel and AIP sprint. If the propeller cavitates or is not feasible, it must be re-optimized. Table 45 shows the input values for the propeller analysis. Table 45 - Input Values for Propeller Optimization Description Value Thrust AIP endurance @ 5 knt 18.14 kN Thrust AIP Sprint @ 22 knt 298.6 kN Thrust Snorkel (submerged) @ 12 knt 94.71 kN Propeller Diameter (Dp) (optimized) 4.5 m Wake fraction (based on Prop Dia) 0.20 Depth of shaft centerline (SSGX submerged) 30 m Depth of shaft center line (snorkel) 14 m Number of blades 7 Burrill Percent of Back Cavitation 5% Weight fuel AIP (Hydrogen) 621 lton Weight fuel Diesel 160 lton w = 0.2
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Design Report Guided Missile Submarine SSG(X) - AOE - Virginia ...

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