Introduction:
Specific fuel consumption is defined as the amount of fuel consumed for each unit of brake power developed per hour. Thermal efficiency of an engine is defined as the ratio of the output to that of the chemical energy input in the form of fuel supply.
Brake Specific Fuel Consumption
Specific fuel consumption is defined as the amount of fuel consumed for each unit of brake power developed per hour. It is a clear indication of the efficiency with which the engine develops power from fuel.
Brake specific fuel consumption (bsfc)
This parameter is widely used to compare the performance of different engines.
Thermal Efficiency and Heat Balance
Thermal efficiency of an engine is defined as the ratio of the output to that of the chemical energy input in the form of fuel supply. It may be based on brake or indicated output. It is the true indication of the efficiency with which the chemical energy of fuel (input) is converted into mechanical work. Thermal efficiency also accounts for combustion efficiency, i.e., for the fact that whole of the chemical energy of the fuel is not converted into heat energy during combustion.
Exhaust Smoke and Other Emissions
Specific Weight
Specific weight is defined as the weight of the engine in kilogram for each brake power developed and is an indication of the engine bulk. Specific weight plays an important role in applications such as power plants for aircrafts.