Mixed/Dual Cycle

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Dual Combustion Cycle (also known as the limited pressure or mixed cycle, Seiliger cycle or Sabathe cycle) is a thermal cycle that is a combination of the Otto cycle and the Diesel cycle. Heat is added partly at constant volume and partly at constant pressure, the advantage of which is that more time is available for the fuel to completely combust. Because of lagging characteristics of fuel this cycle is invariably used for diesel and hot spot ignition engines.

The dual cycle consists of following operations:

Adiabatic compression
Addition of heat at constant volume.
Addition of heat at constant pressure.
Adiabatic expansion.
Rejection of heat at constant volume.

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Thermodynamic cycles

Cycles normally with
external combustion

Gas cycles without phasechange - hot air engine cycles	Bell Coleman cycle · Brayton/Joule cycle; (Externally heated) · Carnot cycle · Ericsson cycle · Ported constant volume cycle[1] · Stirling cycle · Pseudo Stirling cycle (same as Adiabatic Stirling cycle) · Stoddard cycle · Vuilleumier cycle

Cycles with phasechange	Kalina cycle · Rankine cycle (encompasses Organic Rankine Cycle) · Regenerative cycle · Two phased Stirling cycle[2]