Controllable Pitch Propeller Model Sample Clauses

Controllable Pitch Propeller Model. The Stena Carrier is equipment with two controllable pitch ice propellers. The blades are designed to operate at a power of 9168 kW (90% MCR) and shaft speed of 130 rpm to provide a top sailing speed of 21.6 knots. In the design condition, the vessel sails with all four engines running or 2+2 engine mode, however, this is not always the case in the real world. Therefore additional case will have to be considered where only one engine is operated for each shaft, 1+1, and when one shaft runs both its engines while the other shaft only runs one, 2+1. The propeller nominally operates at rotational speeds between 96-130 rpm. The specifications of the Stena Carrier’s CPP propeller are shown in Table 59. Propeller diameter 5000 [mm] Number of blades 4 Hub diameter 1600 [mm] Mean pitch 5511 [mm] Vessel speed 18 [knots] 14 [knots] Propeller revolutions 114 [rpm] 117 [rpm] Efficiency 62.6% 49.0% Table 59: Stena Carrier propeller specifications The rotational speed and diameter result in a tip speed of 34.0 m/s. Above this speed, higher noise and vibration levels are expected. Inputs into the model are the shaft speed and advance speed of the water, while the outputs are the trust and torque of the propeller as shown in Figure 95. Figure 92: Four-quadrant CPP model Table 60 gives the input and output parameters needed to define the GES CPP propeller model block. Type Name Gates Paramet ers WB CPP four quadrant 2 7 Version INOMAN.1 Help Maritime Created Fuel type 0 TNO SWBS 2452 11/24/2013 gate # Index Power [In,Out] effort cal unit flow cal unit parameter # name value unit
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