What are the diagrams of the Otto cycle?
What are the diagrams of the Otto cycle?
The Otto cycle is often plotted on a pressure-volume diagram (pV diagram) and a temperature-entropy diagram (Ts diagram).
What is Otto cycle in mechanical engineering?
The entire modern petrol engine works on Otto cycle. It consist of four processes, Two isentropic (reversible adiabatic) processes and two isochoric (constant volume) processes. It has low compression ratio ranges from 7:1 to 10:1.
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. An isentropic process appears as a vertical line on a T-s diagram. The area under a process curve on a T-s diagram is related to the amount of heat transferred to the gas.
What is the difference between Otto cycle and diesel cycle?
The Otto cycle has less compression ratio (7:1 to 10:1) but in diesel cycle the compression ratio is high (11:1 to 22:1). In Otto cycle as well as in diesel cycle heat rejection takes place at constant volume. The efficiency of Otto cycle is less as compared with the Diesel cycle.
Why is there constant pressure in a diesel cycle?
Diesel cycle has a constant preassure because heat addition takes at power stroke,so the diesel is injected so combustion of fuel takes place at this point so heat inside the cylinder increases so the preassure will increase but at the same time the piston moves down so pressure is assumed to decrease due to expansion …
What is the mean effective pressure in Otto cycle?
1 Mean Effective Pressure (MEP; Otto Cycle) Generally, MEP is defined as the ratio of the net work done to the displacement volume of the piston.
How do you calculate effective pressure?
The mean effective pressure(mep) is a usefull relative engine performance measure and is obtained by dividing the work done per cycle by the cylinder(s) total displaced volume per cycle. Mean effective pressure is hypothetical pressure, which is thought to be acting on the piston throughout the power stroke.
What is the cycle efficiency of an Otto cycle?
7.3 Otto cycle 7.4. Variation of the normalized power output and the thermal efficiency of the irreversible Otto cycle with the compression ratio, γ = 1.4, ηcom = 0.85, and ηexp = 0.90.
What is the 4 1 process in 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 Carnot cycle with diagram?
The Carnot cycle consists of the following four processes: A reversible isothermal gas expansion process. In this process, the ideal gas in the system absorbs qin amount heat from a heat source at a high temperature Thigh, expands and does work on surroundings….T-S Diagram.
| Process | ΔT | ΔS |
|---|---|---|
| IV | Thigh−Tlow | 0 |
| Full Cycle | 0 | 0 |
