Comparison of otto cycle and diesel cycle, otto cycle and diesel cycle,#otto cycle, diesel cycle#

In the Otto cycle, we supply and reject heat at constant volume. In the diesel cycle, we supply heat at constant pressure and reject heat at constant volume. In the Otto cycle, we assumed supply heat at constant volume because here combustion takes very fast so the piston doesn't get time to go up quickly but in the diesel cycle spot, combustion takes place which means in many places small combustion takes place. So when the piston moves up compression takes place pressure increases. When the piston is pushed down when pressure increased very high after some time due to spot combustion then pressure reduces. So on average, we assume heat is supplied at constant pressure. In two-stroke, suction and compression take place when the piston moves up. Expansion and exhaust take place when the piston moves down. In two-stroke beside the crankcase, there is a valve inlet valve that gets open which is located down of the piston when the piston moves up so suction and compression take place together. After combustion exhaust port opens as the piston is pushed down so power and exhaust take place together.
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