Table of Contents
What is pV and TS diagram of Otto cycle?
pV diagram of Otto Cycle. The area bounded by the complete cycle path represents the total work that can be done during one 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 process?
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 the first operation to complete the Otto cycle or constant volume process?
The cycle begins with the intake stroke in which fresh reactants (fuel and air) are drawn into the engine’s cylinder by a downward-expanding piston motion. The second stroke is compression in which the piston moves from the bottom to top of the engine thereby reducing the volume of the fuel and air.
Under which process heat is supplied in the Otto cycle Mcq?
Otto cycle is the one which has two constant volume heat transfer processes and two adiabatic work transfer processes. The Otto cycle 1-2-3-4 consists of the following four processes: Process 1-2: Reversible adiabatic compression of air. Process 2-3: Heat addition at constant volume.
What is Carnot cycle with diagram?
The Carnot cycle consists of the following four processes: A reversible isothermal gas expansion process….T-S Diagram.
| Process | ΔT | ΔS |
|---|---|---|
| I | 0 | −nRln(V2V1) |
| II | Tlow−Thigh | 0 |
| III | 0 | −nRln(V4V3) |
| IV | Thigh−Tlow | 0 |
What is constant in Otto cycle?
Explanation:
| Otto Cycle | Constant volume heat rejection. Constant volume heat addition. |
|---|---|
| Diesel Cycle | Constant pressure heat addition. Constant volume heat rejection. |
| Dual Cycle | Constant volume and constant pressure heat addition Constant volume heat rejection |
What is difference between Miller and Otto cycles?
The Miller cycle engine is compared to a standard Otto cycle engine using cycle analyses and multidimensional simulation, and basic engine design implications are discussed. It is found that the Miller cycle engine has a potential for improved fuel efficiency, but at the cost of a reduced power to weight ratio.
What is the basic Diesel cycle?
Diesel Cycles have four stages: compression, combustion, expansion, and cooling.
What is Otto cycle derive its efficiency?
About 70-75\% is rejected as waste heat without being converted into useful work, i.e., work delivered to wheels. When we rewrite the expression for thermal efficiency using the compression ratio, we conclude the air-standard Otto cycle thermal efficiency is a function of compression ratio and κ = cp/cv.
How is heat added in Otto cycle?
In the Otto cycle, there is no heat transfer during the process 1–2 and 3–4 as they are isentropic processes. Heat is supplied only during the constant volume processes 2–3 and heat is rejected only during the constant volume processes 4–1.
What is Otto cycle?
There are four processes in the Otto Cycle which are two isentropic (reversible adiabatic) processes and two isochoric (constant volume) processes. And has a low compression ratio ranges from 7:1 to 10:1. Here we understand what is otto cycle T-S diagram and otto cycle P-V diagram.
What is the compression ratio of the Otto cycle?
There are four processes in the Otto Cycle which are two isentropic (reversible adiabatic) processes and two isochoric (constant volume) processes. And has a low compression ratio ranges from 7:1 to 10:1.
What is the volume of the chamber in the Otto cycle?
For example, let assume an Otto cycle with compression ratio of CR = 10 : 1. The volume of the chamber is 500 cm³ = 500×10-6 m 3 (0.5l) prior to the compression stroke. For this engine all required volumes are known: V 1 = V 4 = V max = 500×10-6 m 3 (0.5l) V 2 = V 3 = V min = V max / CR = 55.56 ×10-6 m 3
What is the difference between the actual and ideal Otto engine?
The main differences between the actual and ideal Otto engine appear in the figure. In reality, the ideal cycle does not occur and there are many losses associated with each process. For an actual cycle, the shape of the pV diagram is similar to the ideal, but the area (work) enclosed by the pV diagram is always less than the ideal value.