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The propeller is the working object of the propulsion motor, and the characteristics of the propulsion motor must be adapted to the working characteristics of the propeller, so that they can work well with each other. The following takes DC electric propulsion as an example to …
When the speed is constant, the relationship curve Mt=f(n) between the resistance torque and the rotational speed during the propeller reversal process is called the propeller reversal characteristic curve. The reverse characteristic curve of the propeller has a very peculiar shape, as shown in Figure …
Propeller characteristics refer to the relationship curve between propeller torque, power and rotational speed, that is, M=f(n), P=f(n) curves. The most commonly used are the following three typical characteristic curves: (1) Free navigation characteristics My=f(n), Py=f(n); (2) Mooring characteristics or anchoring characteristics Mz=f(n), Pz=f(n); (3) …
The open-water properties of a propeller refer to the hydrodynamic performance of an isolated propeller in a uniform flow field. The ship resistance is generally considered the resistance of the isolated hull alone. The actual propeller works at the stern of the ship. The ship …
The working characteristics of the propeller For a propeller with a certain geometry, its thrust coefficient KP, drag torque coefficient KM and efficiency ηP are only related to the advance speed ratio J, and the relationship between KP, KM, ηP and J is called the propeller characteristic curve. …
The profile of the blade can be represented by the front and side views of the propeller. The front view of the propeller is seen from the back of the ship to the bow, and the side view is seen from the side of the …
surface pitch of the propeller The blade surface of the propeller blade is a part of the helical surface (see Figure 1a), so the intersection of any cylindrical surface that is coaxial with the propeller and the blade surface is a segment of the helix, …
The propeller is commonly known as the vehicle blade, and its appearance is shown in Figure 2-1. The propeller is usually installed at the stern of the ship (but there are also some special ships equipped with propellers at the fore and aft, such as …
Current status of electric propulsionAt the end of the 20th century, countries all over the world are keen on researching ship electric propulsion technology. More than 80% of newly built ships use electric propulsion, and the proportion is getting higher and higher. In addition, shipbuilding …
Ship electric propulsion is not a new term. This term appeared in 1838 and has a history of more than 160 years. Ship electric propulsion develops with the continuous progress of the ship and shipping industry and the electrical and power electronic technology. In the …