Question

Actual flame temperature is always lower than the adiabatic flame temperature, because there is ______________.

• A. no possibility of obtaining complete combustion at high temperature.
• B. always loss of heat from the flame.
• C. both (a) and (b).
• D. neither (a) nor (b).

Answer 1

Answer: (C)

both (a) and (b).

The constant volume adiabatic flame temperature is the temperature that results from a complete combustion process that occurs without any work, heat transfer or changes in kinetic or potential energy. The constant pressure adiabatic flame temperature is the temperature that results from a complete combustion process that occurs without any heat transfer or changes in kinetic or potential energy. Its temperature is lower than the constant volume process because some of the energy is utilized to change the volume of the system (i.e., generate work).