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    The application of propeller


    There are many types of ship propellers, according to different principle,there are propellers, water propulsion and special propulsion. Propeller is the hub and a number of radial fixed to the hub of the composition of the propeller, commonly known as the car leaves. The propeller is installed below the aft waterline and is powered by the mainframe, pushing the water to the ship and pushing the ship forward with water. Propeller structure is simple, light weight, high efficiency, under the waterline and be protected.


    Propeller is the main propulsion tool for modern ships, and now most ships are propelled by propellers. There are many types of propellers. According to the number of blades, the propeller has 2, 3 or 4 blades, and even more. In common, the number of blades is more, the absorbed power is bigger.


    Ordinary transport ships have 1 to 2 propellers. Large propulsion power ships,can add the number of propeller. Large fast passenger boat with double oar to four oars. Propeller generally have 3 to 4 blades, the diameter according to the horse’s horsepower and draft, the bottom does not touch the bottom, the top does not exceed the full load line prevail. Propeller speed should not be too high, the ocean cargo ship for about 100 per minute or so, small speedboat speed of up to 400 to 500 per minute, but the efficiency will be affected. Since the 1960s, the ship has become more and more large, the use of high-power host, the propeller vibration caused by the stern vibration, structural damage, noise, erosion and other issues caused by the attention of countries. The fundamental reason for the propeller vibration is that the load of the propeller blades is aggravated, and the local unstable cavities are likely to be generated when the ship is running in the uneven wake, which causes the pressure, amplitude and phase of the propeller to act on the hull.


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