Diesel cycle is a gas power cycle invented by Rudolph Diesel in the year 1897. It is widely used in diesel engines. Diesel cycle is similar to Otto cycle except in the fact that it has one constant pressure process instead of a constant volume process (in Otto cycle). Diesel cycle can be understood well [...]

## Derivation of mean effective pressure of Otto cycle

In my previous articles, I gave an introduction to Otto cycle and derived the air-standard efficiency of Otto cycle. In this article, I will derive the mean effective pressure (m.e.p) of Otto cycle. What is Mean Effective Pressure? Mean effective pressure is the ratio of work done (W) during the working stroke(s) of a cycle [...]

## Derivation of air-standard efficiency of Otto Cycle

In my previous article, I gave a short introduction to Otto cycle and discussed the processes in it. In this article, I will derive the air-standard efficiency of Otto cycle. p-V and T-s Diagrams of Otto Cycle: p-V Diagram T-s Diagram Basic terms used in derivation of air-standard efficiency of Otto cycle: Total Cylinder Volume: [...]

## Otto Cycle – Processes with p-V and T-s Diagrams

Otto cycle is a gas power cycle that is used in spark-ignition internal combustion engines (modern petrol engines). This cycle was introduced by Dr. Nikolaus August Otto, a German Engineer. An Otto cycle consists of four processes: Two isentropic (reversible adiabatic) processes Two isochoric (constant volume) processes These processes can be easily understood if we [...]

## Introduction to Gas Power Cycles

A thermodynamic cycle is a sequence or series of processes performed on a system, that eventually returns the system to its original state. Gas power cycles are thermodynamic cycles, which use air, as the working fluid. A gas power cycle may consist of heat transfer, work transfer, pressure variations, temperature variations, volume variations and entropy [...]