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Thermal Engineering by Sukumar Pati, Sadhu Singh

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Chapter 11

Performance of Internal Combustion Engines

11.1 ❐ PERFORMANCE PARAMETERS

The performance of an engine is an indication of the degree of success with which the conversion of chemical energy contained in the fuel is done into useful mechanical work. The degree of success is compared on the basis of following parameters:

  1. Specific fuel consumption (SFC)
  2. Brake mean effective pressure (BMEP)
  3. Specific power output (SP)
  4. Specific weight (SW)
  5. Exhaust smoke and other emissions

However, in the evaluation of engine performance, the following performance parameters are chosen:

  1. Power and mechanical efficiency
  2. Mean effective pressure and torque
  3. Specific output
  4. Fuel-air ratio
  5. Volumetric efficiency
  6. Specific fuel consumption
  7. Thermal efficiency ...

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