What is meant by dual cycle?
Dual cycle, or limited pressure cycle, is a thermodynamic cycle that combines the Otto cycle and the Diesel cycle In the dual cycle, combustion occurs partly at constant volume and partly at constant pressure It can be used to describe internal combustion engines
What is dual cycle used for?
Dual combustion cycle finds application in Diesel engine Dual combustion cycle is an ideal air standard closed cycle, which has five processess where heat addition be firstly at constant volume and next at constant pressure and rejection at constant volume This has application to use in Diesel engines
Why is it called dual cycle?
So this is the difference between the air standard cycles and the practical engines This Dual cycle is a compromise between the Otto cycle and the Diesel Cycle so it is called the mixed cycle or Limited pressure Cycle
What is air standard dual cycle?
An air standard dual cycle has a compression ratio of 16 and compression begins at 1 bar and 50⁰C The maximum pressure is 70 bar The heat transformed to air at constant pressure is equal to heat transferred at constant volume
What is the other name of dual cycle?
What is the other name of dual cycle? Explanation: Dual cycle is combination of otto cycle and diesel cycle Dual cycle is also known as mixed cycle
What is efficiency of dual cycle?
For dual cycle, efficiency depends not only on compression ratio but also on how much heat is added at constant volume and constant pressure For same amount of heat added, efficiency will increase if its share in constant volume heat addition is increased and vice versa
What are the assumptions in dual cycle?
1- The working fluid is air, which continuously circulates in a closed loop (cycle) Air is considered as ideal gas 2- All the processes in (ideal) power cycles are internally reversible 3- Combustion process is modeled by a heat-addition process from an external source
Where are dual cycle engines used?
Because of lagging characteristics of fuel this cycle is invariably used for Diesel and hot spot ignition engines It consists of two adiabatic and two constant volume and one constant pressure processes
Which statement is correct of dual cycle?
Explanation: None Explanation: Another name for Dual cycle is a mixed cycle Explanation: Since, Dual Cycle is a combination of Otto cycle and Diesel cycle, so in Dual cycle, generally heat addition takes place first at constant volume then at constant pressure
What is dual combustion cycle?
Dual Combustion Cycle is a combination of Otto cycle and Diesel cycle It is sometimes called semi-diesel cycle, because semi-diesel engines work on this cycle In this cycle, heat is absorbed partly at a constant volume and partly at a constant pressure
Which is more efficient Otto or Diesel?
Explanation: Otto cycle is more efficient than Diesel cycle for a given compression ratio For constant maximum pressure and heat input, the air standard efficiency of the gas power cycle is in the order
Which engine works on 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
Is dual cycle more efficient than diesel cycle?
For same compression ratio: Dual cycle efficiency is more than the diesel cycle Diesel cycle efficiency is less than Otto and dual cycle
Is dual cycle more efficient than Otto cycle?
Otto cycle has the highest work output and efficiency The dual cycle has the efficiency between the Otto and diesel cycle ŋOtto > ŋDual > ŋDiesel Same as the same compression ratio and hear addition
What is cutoff ratio in dual cycle?
9-54 An ideal dual cycle has a compression ratio of 14 and cutoff ratio of 12 The thermal efficiency, amount of heat added, and the maximum gas pressure and temperature are to be determined 3 Air is an ideal gas with constant specific heats
Is Stirling cycle reversible?
The cycle is reversible, meaning that if supplied with mechanical power, it can function as a heat pump for heating or cooling, and even for cryogenic cooling The cycle is defined as a closed regenerative cycle with a gaseous working fluid
What is dual combustion cycle name the processes of dual combustion cycle?
The dual combustion cycle is the combustion of Otto and diesel cycles It is also called the semi-diesel cycle because semi-diesel engines work on this cycle In this cycle, heat is absorbed partially at constant pressure It has two adiabatic, two constant volume, and constant pressure processes
Who invented 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 The Otto cycle engine employs a spark to ignite a mixture of air and, traditionally, gasoline2 compressed by the piston within the engine cylinder
Is dual cycle more efficient?
In the dual cycle, combustion occurs partly at constant volume and partly at constant pressure Therefore the advantage is that more time is available for the fuel to completely combust On the other hand the use of a dual cycle is slightly more complex The thermal efficiency lies between Otto and Diesel cycle
What is the formula for efficiency of dual cycle?
It can be noted from Equation A that a value of pressure ratio α > 1 results in an increased efficiency for given value of r and ρ Hence the efficiency of the dual cycle lies between the Otto and Diesel cycles for given value of compression ratio
How the heat addition in dual cycle takes place?
Dual Cycle: The dual cycle is a thermodynamic cycle that combines the Otto cycle and the Diesel cycle In this cycle, the heat addition occurs partly at constant volume and partly at constant pressure In a dual gas, cycle heat rejection takes place during the constant volume process