Table of Contents
When the compression ratio is 6 What is efficiency of Otto cycle?
f=36. 2%
What is the efficiency of an ideal standard Otto cycle if the compression ratio is 7?
Efficiency of otto cycle = 1 – \frac{1}{7^{1.4-1}} =54%.
What is the compression ratio of Otto cycle?
Solved Problem 3.7 – An ideal air-standard Otto cycle engine has a compression ratio of 8. At the beginning of the compression process, the working fluid is at 100 kPa, 27°C (300 K), and 800 kJ/kg heat is supplied during the constant volume heat addition process.
What is CV in Otto cycle?
cv,c = the mean specific heat at constant volume for the air during the compression stroke (process 1-2).
What is the ideal compression ratio of an Otto cycle that uses air as the gas and has an efficiency of 50 %?
The mean effective pressure (MEP). 9-35 An ideal Otto cycle with air as the working fluid has a compression ratio of 9.5. The highest pressure and temperature in the cycle, the amount of heat transferred, the thermal efficiency, and the mean effective pressure are to be determined.
What is more efficient Otto or Diesel?
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.
Which cycle has maximum efficient Otto or Diesel?
Otto 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.
Why is Otto cycle less efficient than Carnot cycle?
The reversible Otto and Brayton cycles don’t operate between two fixed temperature reservoirs as does the Carnot cycle. That makes them less efficient.
Is the compression ratio of an engine working on Otto cycle is 5 then air standard efficiency in percentage will be?
Thus,if the compression ratio of an engine working on Otto cycle increases from 5 to 7, the % increases in the efficiency ,η=14%
What is the air standard efficiency of an Otto cycle engine having 20% clearance?
What is the efficiency of an ideal air standard otto cycle if the clearance volume is 20% of the swept volume? Efficiency of otto cycle = 1 – (frac{1}{6^{1.4-1}} )=0.511=51.1%.
For which cutoff ratio the efficiency of Otto and diesel cycle becomes identical?
Actually right answer is 1, when cutoff is 1, efficiency of diesel cycle approaches efficiency of Otto cycle at same compression ratio.
Which cycle has higher efficiency?
The Brayton (gas turbine) cycle, which makes one-half of the electricity in the IFCC, is inherently more efficient than a Rankine (steam) cycle, because there is no loss of the heat of vaporization of the water to make steam in the Brayton cycle.
What are the advantages of the Otto cycle?
Advantages and Disadvantages of Otto cycle engine. Advantages: This cycle has more thermal efficiency in comparison to diesel and dual cycle for identical compression ratio and equal heat input rate and same compression ratio and same heat rejection. This cycle engine required less maintenance and are simple and light-weight in design.
Why is Otto cycle a constant volume cycle?
The otto cycle (or gasoline cycle) is a constant volume process (combustion occurs when the volume remains constant ideally). You have to provide a spark to initiate the combustion. This is called Spark Ignition engine. The diesel cycle is a constant pressure cycle where combustion occurs at constant pressure.
What is the difference between Otto cycle and Diesel cycle?
Differences in Fuel Input. Fuel inlet into the gasoline engine.
Is the Otto cycle the same for all petrol engines?
Yes petrol engines run on the Otto cycle but it is not the same for all engines as the graph wil change according to the variation of engine and piston speed from one engine to another. Exercise your jaw with this new device. This is changing jawlines everywhere.