Question

what is diseal engine

Answer 1

Diesel engine



Diesel engine built by Langen & Wolf under licence, 1898.



1952 Shell Oil film showing the development of the Diesel engine from 1877

The Diesel engine (also known as acompression-ignition or CI engine), named after Rudolf Diesel, is an internal combustion engine in which ignition of the fuel, which is injected into the combustion chamber, is caused by the elevated temperature of the air in the cylinder due to the mechanical compression (adiabatic compression). Diesel engines work by compressing only the air. This increases the air temperature inside thecylinder to such a high degree that atomised Diesel fuel injected into the combustion chamber ignites spontaneously. With the fuel being injected into the air just before combustion, the dispersion of the fuel is uneven; this is called a heterogenous air-fuel mixture. The process of mixing air and fuel happens almost entirely during combustion, the oxygen diffuses into the flame, which means that the Diesel engine operates with adiffusion flame. The torque a Diesel engine produces is controlled by manipulating the air ratio; this means, that instead of throttling the intake air, the Diesel engine relies on altering the amount of fuel that is injected, and the air ratio is usually high.

The Diesel engine has the highest thermal efficiency (engine efficiency) of any practicalinternal or external combustion engine due to its very high expansion ratio and inherent leanburn which enables heat dissipation by the excess air. A small efficiency loss is also avoided compared with two-stroke non-direct-injection gasoline engines since unburned fuel is not present at valve overlap and therefore no fuel goes directly from the intake/injection to the exhaust. Low-speed Diesel engines (as used in ships and other applications where overall engine weight is relatively unimportant) can reach effective efficiencies of up to 55%.[1]

Diesel engines may be designed as either two-stroke or four-stroke cycles. They were originally used as a more efficient replacement for stationary steam engines. Since the 1910s they have been used insubmarines and ships. Use in locomotives, trucks, heavy equipment and electricity generation plants followed later. In the 1930s, they slowly began to be used in a fewautomobiles. Since the 1970s, the use of Diesel engines in larger on-road and off-road vehicles in the US has increased. According to Konrad Reif, the  average for Diesel cars accounts for 50% of the total newly registered.

The world's largest Diesel engines put in service are 14-cylinder, two-stroke watercraft Diesel engines.

Answer 2

Diesel engine is a that can run only with Diesel.