What is ideal Otto cycle?
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Otto cycle Thermodynamics. 1. an ideal thermodynamic combustion cycle, as follows: a compression at constant entropy; a constant-volume heat transfer to the system; an expansion at constant entropy; and a constant-volume heat transfer from the system.
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.
What is Otto cycle with diagram?
The idealized diagrams of a four-stroke Otto cycle Both diagrams: the intake (A) stroke is performed by an isobaric expansion, followed by an adiabatic compression (B) stroke.
How can I make my Otto cycle more efficient?
How to increase the efficiency of the Otto cycle?
- Operate the engine on lean fuel. That means it consumes additional air. As you know, lean fuel can increase engine efficiency.
- Increase compression ratio. Here it is limited by the spontaneous combustion of uneven petrol.
What is ideal cycle efficiency?
Modern engines have compression ratios in the range 8 to 11, resulting in ideal cycle efficiencies of 56% to 61%.
Which of the following power cycle is ideal cycle?
The Rankine cycle
The Rankine cycle is the ideal cycle for vapor power plants; it includes the following four reversible processes: 1-2: Isentropic compression Water enters the pump as state 1 as saturated liquid and is compressed isentropically to the operating pressure of the boiler.
How does the ideal Diesel cycle differ from the ideal Otto cycle?
The most significant difference between the ideal Otto cycle and the ideal Diesel cycle is the method of igniting the fuel-air mixture. Recall that in the ideal Diesel cycle the extremely high compression ratio (around 18:1) allows the air to reach the ignition temperature of the fuel.
What is PV and TS diagram?
As described on the work slide, the area under a process curve on a p-V diagram is equal to the work performed by a gas during the process. On the right of the figure we have plotted the temperature versus the entropy of the gas. This plot is called a T-s diagram.
What are ideal cycles?
Ideal cycles are simplified thermodynamic closed cycles to analyze the compression, combustion, and expansion process in an engine with a focus on extraction of work from combustion of the fuel–air mixture.
How long is the ideal cycle?
The length of the menstrual cycle varies from woman to woman, but the average is to have periods every 28 days. Regular cycles that are longer or shorter than this, from 21 to 40 days, are normal.
What is the difference between ideal and actual cycle?
The largest difference between the two diagrams is the simplification of the intake and exhaust strokes in the ideal cycle. In the exhaust stroke, heat Qout is ejected into the environment. In a real engine, the gas leaves the engine and is replaced by a new mixture of air and fuel.
What are four processes make up the ideal Otto cycle?
Thermal engines. Internal combustion engines (IC engines) External combustion engines (EC engines) Reaction engines.
What is difference between Otto and Diesel cycle?
– In the Otto cycle, heat addition takes place at constant volume – At the time of heat addition, the piston is at the Top Dead Centre (TDC). – The Otto cycle has compression ratio from 7:1 to 10:1 which is lesser than that of a diesel cycle. – It has comparatively has higher thermal efficiency. – It uses spark plugs to ignite the charge (fuel+air).
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 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.