How is Otto cycle efficiency derived?
In this equation, the ratio V1/V2 is known as the compression ratio, CR. When we rewrite the expression for thermal efficiency using the compression ratio, we conclude the air-standard Otto cycle thermal efficiency is a function of compression ratio and κ = cp/cv.
What are the 4 stages of the 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.
How does Otto cycle work?
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.
Who invented the Otto cycle?
Nikolaus August Otto
Nikolaus Otto, in full Nikolaus August Otto, (born June 10, 1832, Holzhausen, Nassau, Germany—died January 26, 1891, Cologne), German engineer who developed the four-stroke internal-combustion engine, which offered the first practical alternative to the steam engine as a power source.
What is the difference between Diesel cycle and Otto cycle?
Otto cycle is used for petrol or spark ignition engine while diesel cycle is used for diesel or compression ignition engine. The main difference between Otto cycle and Diesel cycle is that in Otto cycle heat addition takes place at constant volume and in diesel cycle heat addition takes places at constant pressure.
How many strokes are there in Otto cycle?
four engine strokes
The Otto Cycle involves four engine strokes. A stroke is defined as a process in which the cylinder’s piston moves up to the top of the engine or down to the bottom of the engine.
Is Otto cycle a petrol engine?
Otto cycle The Otto Cycle is named after Nikolaus Otto (1832–1891, German) who is credited as the first creator of a petroleum fuel based internal combustion engine operating under a four stroke cycle.
Who invented Otto cycle?
Nikolaus Otto
Nikolaus Otto is generally credited with building the first four-stroke internal combustion engine in 1876. In doing so he established the principle still in use today.
Who is the Otto cycle named after?
Otto cycle The Otto Cycle is named after Nikolaus Otto (1832–1891, German) who is credited as the first creator of a petroleum fuel based internal combustion engine operating under a four stroke cycle.
What is the other name of Otto cycle?
Three types of internal combustion engines were designed by German inventors Nicolaus Otto and his partner Eugen Langen. The models were a failed 1862 compression engine, an 1864 atmospheric engine, and the 1876 Otto cycle engine known today as the gasoline engine.
Which is better Otto or Diesel?
The Otto cycle has less compression ratio (7:1 to 10:1) but in diesel cycle the compression ratio is high (11:1 to 22:1). In Otto cycle as well as in diesel cycle heat rejection takes place at constant volume. The efficiency of Otto cycle is less as compared with the Diesel cycle.
What is Otto cycle in petrol engine?
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. It consist of four processes, Two isentropic (reversible adiabatic) processes and two isochoric (constant volume) processes.
What is Otto cycle – P-V and T-S diagram easiest explanation?
What is Otto Cycle – P-V and T-S Diagram Easiest Explanation? 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. It consist of four processes, Two isentropic (reversible adiabatic)
What is the volume ratio of Otto cycle?
The volume ratio ( V4 / V3) is known as the isentropic expansion ration, but for Otto cycle, it is equal to the compression ratio. Isochoric decompression (exhaust stroke) – In this phase the cycle completes by a constant-volume process in which heat is rejected from the air while the piston is at bottom dead center.
How many revolutions does an otto engine have?
The thermodynamic cycle of Otto’s engine required four piston strokes and two crankshaft revolutions to complete, but it ran smoothly, was relatively quiet, and was very reliable and efficient. Otto’s engine was an immediate success, and by 1886, more than 30,000 had been sold.