An Otto cycle is an idealized thermodynamic cycle that describes the functioning of a typical spark ignition piston engine. It is the thermodynamic cycle
most commonly found in automobile engines
.
What cycle do car engines use?
Car engines use a
four-stroke combustion cycle
. The four strokes are intake, compression, combustion, and exhaust. The strokes are repeated over and over, generating power.
Is Otto engine and petrol engine same?
Virtually all of the world’s makers of automobiles produce vehicles using
Otto cycle engines which are so ubiquitous as to be referred to as gasoline engines
.
Do diesel engines use the Otto cycle?
While the original Otto cycle engine used gasoline as a fuel source,
diesel engines use the same 4-cycle operation
through mixing a fuel/air mixture, fuel compression, downward combustion and exhaust.
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.
What is the difference between Otto cycle and Diesel 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
.
Is the Otto cycle reversible?
The Otto cycle consists of four reversible processes
, two being adiabatic processes and two being isovolumetric processes. Unlike the Carnot Cycle (that consists of two isothermal processes and two adiabatic processes), the input and output temperatures in the Otto Cycle are not constant.
Which cycle is more efficient Otto or diesel?
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.
What is the difference between Otto cycle and Carnot cycle?
Carnot cycle is an ideal cycle proposed by said carnot, ideal cycle. An Otto cycle is an idealized thermodynamic cycle that describes the functioning of a typical spark ignition piston engine
. It is the thermodynamic cycle most commonly found in automobile engines.
What are the 3 types of engines?
- Internal combustion engines (IC engines)
- External combustion engines (EC engines)
- Reaction engines.
Why is it called reciprocating engine?
A reciprocating engine is an engine that
uses one or more pistons in order to convert pressure into rotational motion
. They use the reciprocating (up-and-down) motion of the pistons to translate this energy.
Who had the first V8 engine?
Frenchman
Leon Levavasseur
was a 39-year-old inventor in 1902 when he took out a patent for the first V-8 engine he called the Antoinette. The V8 since then has become the most reliable and efficient internal combustion engine to power automobiles and to see extensive use in power boats and early aircraft.
Why is Otto more efficient than Diesel cycle?
The simple answer is ,In the otto the energy available is fully used to raise the pressure in the cylinder. Higher the pressure implies larger work done. But in diesel cycle,
Part of the energy is added only during the expansion, So it does not contribute to the work
. Hence Otto cycle is more efficient.
What is K in Otto cycle?
Thermal Efficiency Derivation
A typical value for an air/fuel mixture is
k = 1.35
.
Which is more efficient diesel engine or Otto engine?
Otto cycle is more efficient than the diesel cycle
for the same compression ratio while the diesel cycle is more efficient than the Otto cycle for the same maximum pressure and temperature.
Why is Otto cycle irreversible?
All real cycles, including the Otto, are irreversible. The main reason is
all real cycle are not composed of quasi-static processes
, meaning not composed of processes that are carried out so slowly as to appear to be static (not moving), which would make them impractical.
What is the difference between petrol engine and diesel engine?
The primary difference (as most of you already know), is that
petrol engines use spark plugs to ignite the air-fuel mixture, while diesel engines rely on heavily compressed air without any spark plugs
.
What are the limitations of Otto cycle?
Disadvantages of Otto Cycle
It is less efficient than the Diesel cycle
. This cycle is not best for engines (i.e., diesel engines) of heavy vehicles. This has low efficiency. For combustion of the air-fuel mixture, it needs an additional spark plug which increases its cost.
Which has better efficiency ?( petrol or diesel?
Per litre,
diesel contains more energy than petrol
and the vehicle’s engine combustion process is more efficient, adding up to higher fuel efficiency and lower CO2 emissions when using diesel.
What is the difference between SI engine and CI engine?
Si engine is internal combustion engine that operates on the principle of spark ignition. It uses petrol and utilizes the Otto cycle. The diesel (Ci) engine is also an internal combustion engine, which uses diesel fuel and operates on diesel cycle.
What are the main differences between Otto diesel and dual engines?
The main difference between otto, diesel and dual cycle
depends on the thermodynamic process concerned is how you add heat
. In Otto cycle heat addition is Isochoric, i.e Heat is added to the engine when the piston is at the top dead center. which is a constant volume heat addition cycle.
What engine that has a rated speed of 900 to 1200 revolutions per minute?
use in ship propulsion system
High-speed engines
, with rated speeds of 900 to 1,200 revolutions per minute, are used in a few cases in ships, but engines of this class are almost always found in small craft such as tugs, fishing vessels, and high-speed ferries.
What causes ignition to occur in a diesel engine?
The diesel engine, named after Rudolf Diesel, is an internal combustion engine in which ignition of the fuel is caused by
the elevated temperature of the air in the cylinder due to mechanical compression
; thus, the diesel engine is a so-called compression-ignition engine (CI engine).
Is isentropic adiabatic?
In thermodynamics, an isentropic process is an idealized thermodynamic process that is
both adiabatic and reversible
. The work transfers of the system are frictionless, and there is no net transfer of heat or matter.
Which is more efficient Brayton or Otto?
The
Brayton cycle is the ideal cycle for a gas-turbine engine and has the same efficiency as that of the Otto cycle
(Granet, p. 373).
Why is Atkinson cycle more efficient?
The Atkinson cycle is more efficient because
it has a large expansion ratio than compression ratio
. It delays the closing of the suction valve until the piston completes 20% to 30% of the upstroke during the compression stroke.
How is the heat added in the Otto cycle?
Through the combustion of fuel
, heat is added in a constant volume (isochoric process) process, followed by an adiabatic expansion process power (C) stroke. The cycle is closed by the exhaust (D) stroke, characterized by isochoric cooling and isobaric compression processes.
