![]() The operation of these duct propellers would induce a suction of water from the forward porthole of the tunner, and the water jet is ejected from the aft side of the tunnel, resulting in forward motion of the submarine. Ducted tunnels, one on each- port and starboard side, are freely flooded, and provided with a suction propeller driven by individual auxiliary propulsion motors (port and starboard). The endurance motor is located in the second compartment of the propulsion plant, so that either of the two motors can be operated in case of flooding in one of the compartments.ĭuct Propulsion System: Some submarines have an additional ducted propulsion system for added redundancy. In such a scenario, the propeller is driven by the economic motor. In order to increase the endurance of the submarine, when such a need arises, the submarine needs to economise on the consumption of fuel. Based on these temperatures, the flow rate of oil cooling liquids are constantly adjusted to attain the set value.Įconomic Motor / Endurance Motor: In normal cruising and war conditions, the submarine operates on different speed modes of the main propulsion motor. Thermometers are placed at the forward and aft ends of the EPM to measure the temperature of the fuel oil and the lube oil.A pneumatic air coupling is used to connect the flywheel of the main propulsion motor with the line shaft leading to the next compartment.A DC powered motor is always used, as more power losses are observed in AC motors. It is driven by the electric power produced by the batteries. The main electric propulsion plant is located in the first compartment of the propulsion plant (refer to figure). Main Electric Propulsion Motor (EPM): The propulsion plant is distributed over two watertight compartments. ![]() A larger diameter propeller with low RPM enables higher propulsive efficiency. Propeller: Submarines mostly use five bladed propellers with high skew to reduce cavitation and effects of imbalanced thrust forces that act as exciting forces for longitudinal vibration of the shafting system. Figure 1: Propulsion plant of a diesel electric submarine. The layout of a propulsion plant of a diesel electric submarine is shown in Figure 1, and the main components are then discussed below. The propulsion system is housed in the aft section of the submarine. Intercom / Internal communication system. ![]()
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