The four-stroke Otto cycle is made up of the following four internally reversible processes: 1 –2, isentropic compression ; 2–3, constant-volume heat addition; 3–4, isentropic expansion; and 4–1, constant-volume heat rejection.
What is Otto and diesel cycle?
In Otto cycle the heat addition is takes place at constant volume where as in diesel cycle heat is added at constant pressure. Petrol engines work on Otto cycle and diesel engines work on diesel cycle. ... In Otto cycle as well as in diesel cycle heat rejection takes place at constant volume.
What is process in Otto cycle?
The four-stroke Otto cycle is made up of the following four internally reversible processes: 1 –2, isentropic compression ; 2–3, constant-volume heat addition; 3–4, isentropic expansion; and 4–1, constant-volume heat rejection.
What is Otto cycle also known as?
constant pressure cycle . constant volume cycle . constant temperature cycle .
What is Otto cycle in mechanical engineering?
The Otto cycle was given by Dr. Nikolaus August Otto. It is a gas power cycle that is used in spark ignition engine (i.e. petrol engine) for its working. The entire modern petrol engine works on Otto cycle.
What is the ideal Otto cycle?
Otto cycle Thermodynamics. 1. an ideal thermodynamic combustion cycle, as follows: a compression at constant entropy ; a constant-volume heat transfer to the system; an expansion at constant entropy; and a constant-volume heat transfer from the system.
What is the use of Otto cycle?
The Otto Cycle, describes how heat engines turn gasoline into motion . Like other thermodynamic cycles, this cycle turns chemical energy into thermal energy and then into motion. The Otto cycle describes how internal combustion engines (that use gasoline) work, like automobiles and lawn mowers.
What is Otto cycle with diagram?
The idealized diagrams of a four-stroke Otto cycle Both diagrams: the intake (A) stroke is performed by an isobaric expansion, followed by an adiabatic compression (B) stroke. ... The cycle is closed by the exhaust (D) stroke, characterized by isochoric cooling and isobaric compression processes.
Is diesel engine an Otto cycle?
The Diesel cycle is a combustion process of a reciprocating internal combustion engine . ... This is in contrast to igniting the fuel-air mixture with a spark plug as in the Otto cycle (four-stroke/petrol) engine.
Which is more efficient Otto or Diesel cycle?
6 Diesel Cycle
Although for a given compression ratio the Otto cycle has higher efficiency, because the Diesel engine can be operated to higher compression ratio, the engine can actually have higher efficiency than an Otto cycle when both are operated at compression ratios that might be achieved in practice.
How does an Otto engine work?
The Otto cycle engine uses a spark to ignite a mixture of air and – traditionally – gasoline 2 compressed by the piston within the engine cylinder. This spark ignition causes an explosive release of heat energy which increases the gas pressure in the cylinder, forcing the piston outwards as the gas tries to expand.
Is Carnot cycle reversible?
The Carnot heat-engine cycle described is a totally reversible cycle . That is all the processes that compose it can be reversed, in which case it becomes the Carnot refrigeration cycle. This time, the cycle remains exactly the same except that the directions of any heat and work interactions are reversed.
What is ideal cycle?
Ideal cycles are simplified thermodynamic closed cycles to analyze the compression, combustion, and expansion process in an engine with a focus on extraction of work from combustion of the fuel–air mixture.
What is the formula for compression ratio of Otto cycle?
The air-standard Otto cycle thermal efficiency is a function of compression ratio and κ = c p /c v . It is very useful conclusion, because it is desirable to achieve a high compression ratio to extract more mechanical energy from a given mass of air-fuel mixture.
What is a 4 stroke petrol engine?
A four-stroke (also four-cycle) engine is an internal combustion (IC) engine in which the piston completes four separate strokes while turning the crankshaft . ... The piston is moving down as air is being sucked in by the downward motion against the piston.
What is a Rankine cycle process?
The Rankine cycle or Rankine Vapor Cycle is the process widely used by power plants such as coal-fired power plants or nuclear reactors. In this mechanism, a fuel is used to produce heat within a boiler , converting water into steam which then expands through a turbine producing useful work.
