The operating cycle of an internal combustion engine can be broken down into a sequence of separate processes such as intake, compression, combustion, expansion, and exhaust. The accurate analysis of the internal combustion engine process is very complicated but in this article, we will discuss the comparison between Otto, diesel, and dual cycles.
First, you should know the main factors which are used as the basis for comparison of the cycles :
- Compression ratio
- Peak pressure
- Heat addition
- Heat rejection
- Network
In order to compare the performance of these cycles some of the variables which we will see above some of the variable factors must be fixed. This analysis will show which cycle is more efficient for a given set of operating conditions.
Now we do it one by one all variables are fixed and then make a comparison.
- Same compression ratio and Heat addition :
Otto cycle has the highest work output and efficiency.
Diesel cycle has the least efficiency.
The dual cycle has the efficiency between the Otto and diesel cycle.
ŋOtto >
ŋDual > ŋDiesel
- Same compression ratio and Hear rejection :
Otto cycle has the highest work output and efficiency.
The diesel cycle has the least 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.
- Same Peak pressure, Peak temperature and Heat Rejection :
Also for the same peak pressure, peak temperature and heat Rejection same as above two.
ŋOtto > ŋDual > ŋDiesel
- Same Maximum Pressure and Hear Input and Output :
Also for that case same as above all. because now we all know Otto cycle efficiency is always the highest.
ŋOtto > ŋDual > ŋDiesel
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