18 February 2016

Advantages and disadvantages of free-piston engine

free-piston engine is a linear crank less internal combustion engine. Combination of a reciprocating engine and a rotary turbine. It consists of a gasifier and a turbine. Compressor piston is directly attached to a diesel piston. The piston is free because its motion is not controlled by the position of a rotating crankshaft Hence, It is called a free-piston engine. Important features of the free-piston engine are potential reductions in frictional losses. Let us have a deep insight into the pros and cons of the free-piston engine in this article. 

Advantages of the free-piston engine :

  • Mechanical simplicity.
  • Flexibility and reliability.
  • Power to weight ratio.
  • Multi-fuel capability.
  • Low turbine operating temperature.
  • Less vibration and noise.
  • Less maintenance.
  • Easy to start the piston. 
  • Highly suitable for waste heat recovery.
  • Give a high degree of manoeuvrability.
  • Less manufacturing cost.
  • Low NOx emissions.
  • It offers the HCCI combustion process.
  • Internally balanced.
  • Modularity.

Disadvantages of free-piston engine :

  • Poor fuel economy.
  • Stability of fuel supply.
  • Poor part-load efficiency.
  • High combustion rate.
  • Reduction gearing is required.