The main difference between Otto and Diesel cycle is that The otto cycle explosion process takes place at a constant volume process and the Diesel cycle explosion process takes place at a constant pressure process.
In this article, we will be studying the differences between Otto and Diesel cycle in very detail.
Note: At the end of the articles, you will find the PDF which you can easily download.
- The cycles are mostly found in an automobile engine. The fuel used in the Otto cycle is Petrol fuel.
- The heat addition takes place at a constant volume process and It is also known as the Isochoric process.
- The fuel used in the diesel cycle is diesel fuel.
- In the diesel cycle, the heat addition takes place at constant pressure and It is also known as the Isobaric Process.
- Here you can read Diesel Cycle in detail.
The below figure is attached PV and TS Diagram of Otto and Diesel cycle.
|Otto Cycle||Diesel Cycle|
|1-2: Isentropic Compression||1-2: Isentropic Compression|
|2-3: Heat Addition at constant volume||2-3: Heat Addition at constant Pressure|
|3-4: Isentropic Expansion||3-4: Isentropic Expansion|
|4-1: Heat rejection at constant volume processes.||4-1: Heat rejection at constant volume processes.|
Difference Between Otto Cycle and Diesel Cycle:
|Sl No.||Otto Cycle||Diesel Cycle|
|1.||Otto cycle has low thermal efficiency.||The diesel cycle has high thermal efficiency.|
|2.||It has a low compression ratio.||But This one works on a high compression ratio.|
|3.||Otto cycle is also called a Constant volume cycle.||The diesel cycle is called a constant pressure cycle.|
|4.||Otto cycle system is light in weight. But||The diesel cycle is heavy in weight.|
|5.||The explosion process takes place at constant volume process and||In the diesel engine, the explosion process takes place at a constant pressure process.|
|6.||The Spark Plug is used here for igniting the charge.||A fuel injector is used here for igniting the charge.|
|7.||A mixture of air and fuel is entered in suction stroke.||Only air is entered in suction stroke.|
|8.||Here the working fuel is used as Petrol.||The working fuel is used as Diesel.|
|9.||Otto cycle engine is the high-speed engines.||Diesel cycle engines are not high-speed engine comparatively Otto cycle.|
|10.||The engine starting is easy in cold weather too.||But here it is difficult comparatively Otto cycle.|
So These are the 10 Points on differences between the Otto cycle and Diesel cycle. Let me know by using the comment box have you understood or not?
I have also written on the Difference between Spark Ignition vs Combustion Ignition Engine.
Here you can download PDF by just clicking Download PDF.