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Cobalt

Power Diagrams

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THEORETICAL ENGINE CYCLES
M 240

  • Systems and boundaries
  • The general gas law
  • Reversible process, Isothermal process
  • Adiabatic process, Polytropic process
  • The basic theoretical cycles
  • The Carnot cycle
  • The Otto cycle ( constant volume )
  • The Diesel cycle ( constant pressure )
  • The Dual or Combined cycle
  • The actual diesel engine cycle

THE 2 STROKE DIESEL CYCLE
M 241

  • Facts about the 2 stroke cycle
  • X-section of a 2 stroke crosshead diesel engine
  • Scavenging
  • Rotating timing diagram, familiarisation
  • 2 stroke cycle using the rotating timing diagram
  • 2 stroke cycle using the PV diagram

THE 4 STROKE DIESEL CYCLE
M 242

  • Facts about the 4 stroke cycle
  • X-section of a 4 stroke crosshead diesel engine
  • Scavenging
  • Rotating timing diagram, familiarisation
  • 4 stroke cycle using the rotating timing diagram
  • 4 stroke cycle using the PV diagram

INTRODUCTION TO INDICATOR DIAGRAMS
M 251

  • Investigation simulation module on engine diagrams
  • The modelled engine is a turbo-charged 4 stroke 4 cylinder medium speed engine
  • The effects on the PV diagram, the draw card diagram, the delta-pressure diagram and the Weibe diagram can be investigated when changes are made to:
  • Engine speed, Ambient conditions
  • Cylinder bore, Engine stroke
  • Engine compression ratio
  • Turbocharger compression ratio
  • Scavenge air temperature
  • Exhaust & inlet valve timing