Dual Combustion Cycle is a combination of Otto cycle and Diesel cycle. It is sometimes called semi-diesel cycle, because semi-diesel engines work on this cycle. In this cycle, heat is absorbed partly at a constant volume and partly at a constant pressure.
The ideal dual combustion cycle consists of two reversible adiabatic or isentropic, two constant volume and a constant pressure processes. These processes are represented on p-v and T-s diagrams as shown in Fig 5.13 (a) and (b) respectively.
The air standard efficiency of this cycle is given by,
Notes:
1. For Otto cycle, p = 1; and for Diesel cycle, α = 1.
2. The efficiency of dual combustion cycle is greater than Diesel cycle and less than Otto cycle, for the same compression ratio.
The ideal dual combustion cycle consists of two reversible adiabatic or isentropic, two constant volume and a constant pressure processes. These processes are represented on p-v and T-s diagrams as shown in Fig 5.13 (a) and (b) respectively.
The air standard efficiency of this cycle is given by,
Notes:
1. For Otto cycle, p = 1; and for Diesel cycle, α = 1.
2. The efficiency of dual combustion cycle is greater than Diesel cycle and less than Otto cycle, for the same compression ratio.
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