Understand the history of Marine power development

Marine diesel engine power mainly by internal combustion engines, internal combustion engine and the biggest different is its external combustion of fuel in its internal combustion, is simply the chemical energy into mechanical energy, relative to external combustion engine more efficient.

Most modern ships use gas turbines. This kind of engine is characterized by high pressure gas produced by combustion. The high pressure of gas is used to drive the blades of gas turbines to rotate and thus output power.

The other type of ship's modern power is an electric motor, which is a device for converting electrical energy into mechanical energy.It is used to generate rotating magnetic field by using the electric coil, and it is used to close the aluminum frame in a squirrel cage to form magnetoelectric dynamic rotating torque.The advantage of electric motors is that they are quiet and pollution-free.

The most advanced technology is the use of nuclear energy technology, which is the most advanced power at present. Controllable nuclear reaction is used to obtain power, heat and electricity.The advantage of nuclear power has its strong persistence, general nuclear-powered aircraft carrier power can maintain 10 to 20 years, this is unmatched by any other power, power, high cost price, the promotion is limited by a lot of, now used for military ships.

Learn to master the characteristics of Marine diesel engine power efficiency

The advantage of diesel engine is high power and good economic performance.There are many similarities between the working process of diesel engine and gasoline engine, for example, each working cycle also goes through four stroke of inlet, compression, and exhaust.But as a result of diesel engine fuel is diesel, its viscosity is larger than gas oil, it is not easy to evaporation, while the combustion temperature is lower than gasoline, as a result, the formation of combustible mixture and ignition mode are different from gasoline engine.The difference is that the mixture in the cylinder of a diesel engine is pressurised rather than ignited.Diesel engines work, into the cylinder is the air, the air in the cylinder compression to the finish line, the temperature can reach 500-700 ℃, pressure can reach 40-50 atmospheric pressure.Piston near the top dead center, fuel supply system of nozzle with high pressure cylinder combustor within a very short time, jet fuel, diesel form of subtle oil grains, mixed with high pressure high temperature of the air, the combustible mixture combustion, explosive expansion, hard to push the piston downward to do work, the temperature can reach 1900-2000 ℃, pressure can reach 60-100 atmospheric pressure, the power is very big, so the diesel engines are widely used in large diesel devices.