Mister Rudolph Diesel was aware of the gasoline engine ([http://en.wikipedia.org/wiki/Otto_cycle Otto cycle]) problems and wanted to improve it. The gasoline engine inherently has problems with efficiency and/or fuel. In order to improve the efficiency one must increase the compression ratio of an internal-combustion engine (see the bonus section at bottom of this article). However, in the gasoline engine there is a limit - the gasoline-air mixture will self ignite once the compression gets too high (because every compression drives temperature increase). So, either you can have a low-efficient, low-compression engine that uses a cheap fuel, or you can have a high-efficient, high-compression engine that uses expensive, high-refined fuel that wont self-ignite even at high compression levels (a 120 octane gasoline?). In [http://en.wikipedia.org/wiki/Diesel_engine diesel engine] this problem is solved. The diesel engine can use much higher compression levels than the gasoline engine reaching higher efficiency. In addition, the diesel engine can use fuel that is not nearly as refined as the high-octane gasoline fuel (thus cheaper). To make this possible, Rudolph changed the Otto cycle and created the diesel cycle. The difference is that during compression phase, no fuel is present in the cylinder and thus no self-ignition can happen. The fuel is only injected at the moment the ignition is wanted - when injected into the hot pressurized air the diesel fuel self-ignites immediately (the diesel-air mixture, as we said already, is happy to ignite even at relatively low temperatures).
the difference is the heat addition type In Otto Cycle the heat addition is Isochoric ((constant volume)) In Diesel Cycle the heat addition is Isobaric ((constant pressure))
We use cut-off ratio in diesel cycle and not in Otto cycle because it is cost effective.
diesel cycle
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A standard 20 to 1 otto cycle is used for the petrol and diesel cycles for diesel engines. It is higher than gasoline engines due to the way diesels burn and compress fuel.
Diese
in otto cycle the burning of fuel is instantaneously therefore a very small voulme is required for burning of fule
The 4 stroke or 4 cycle engine was invented in 1876 Nicholas Otto in Germany. This is the earliest 4 stroke and is commonly called the Otto cycle engine. The Diesel 4 stoke was invented in 1893 by Rudolph Diesel in Germany.
Diesel mechanics is the knowledge to design, build, and mantain, diesel engines. This type of internal combustion engine works on a thermodynamical cycle called Otto Cycle of Four Stages for Diesel, which has a different behavior of that one followed by the gasoline engines, the latter called Otto Cycle of Four Stages (for gasoline). Diesel is a fuel with higher octane than gasoline, to the point where the use of a spark to ignite the fuel/air mix turns pointless, so the spark plug is ommited and the mix is instead ignited by cylinder compression, making the mix to heat due to drastic pressure increased and volume reduced.
The heat addition and rejection processes in otto cycle are of constant volume, whereas in brayton cycle, they are of constant pressure.
Otto cycle using SI engine is write r wrong Otto cycle using SI engine is write r wrong
The otto cycle is the technical name for the 4 stroke engine. so a Gasoline or Petrol engine.