Opposed Piston 2-Stroke Engine: Difference between revisions

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=Design Considerations=
*Potential for Hydrogen operation - [https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://achatespower.com/wp-content/uploads/2021/05/Hydrogen-Opposed-Piston-Engines.pdf&ved=2ahUKEwjfvtvut9WBAxUclWoFHdFyBIcQFnoECC4QAQ&usg=AOvVaw0670F_dLZOn613cPHFtnpy]
*Potential for Hydrogen operation - [https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://achatespower.com/wp-content/uploads/2021/05/Hydrogen-Opposed-Piston-Engines.pdf&ved=2ahUKEwjfvtvut9WBAxUclWoFHdFyBIcQFnoECC4QAQ&usg=AOvVaw0670F_dLZOn613cPHFtnpy]
*In July 2021, Cummins was awarded an $87M contract by the United States Army to complete the development of the Advanced Combat Engine (ACE), a modular and scalable diesel engine solution that uses opposed-piston technology. [https://en.m.wikipedia.org/wiki/Opposed-piston_engine]
*In July 2021, Cummins was awarded an $87M contract by the United States Army to complete the development of the Advanced Combat Engine (ACE), a modular and scalable diesel engine solution that uses opposed-piston technology. [https://en.m.wikipedia.org/wiki/Opposed-piston_engine]
*Typical 4 stroke fuel-specific oil consumption is .1 percent, and opposed piston engines need to match this to be competitive [https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://achatespower.com/wp-content/uploads/2019/12/2019-01-0068.pdf&ved=2ahUKEwjPmM_fwtWBAxXPlGoFHbpSBMUQFnoECA4QAQ&usg=AOvVaw14FHCvPMhQXdFmyVfDimes]
*Oil scraper rings are used on outboard side in opposed-piston engines [https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://achatespower.com/wp-content/uploads/2019/12/2019-01-0068.pdf&ved=2ahUKEwjPmM_fwtWBAxXPlGoFHbpSBMUQFnoECA4QAQ&usg=AOvVaw14FHCvPMhQXdFmyVfDimes]
*Texturing of bore is i.portant. plateaus work better. Laser etch adds more retention. See above link.


=OSE Proposal for Hydrogen Hydraulic Engine=
=OSE Proposal for Hydrogen Hydraulic Engine=
*Piston-ported exhaust with overhead valve with direct hydraulic pumping on the opposite side, with pilot-flow cylinder return. May need [[Hydraulic Accumulator]] for smoothing.
*Piston-ported exhaust, air bearing-piston, with overhead valve with direct hydraulic pumping on the opposite side, with pilot-flow cylinder return. May need [[Hydraulic Accumulator]] for smoothing.
*Lubrication is via hydraulic fluid, which addresses the lubrication and oil-burn issue of regular 2-strokes, as no oil is used in the fuel
*Lubrication is via hydraulic fluid, which addresses the lubrication and oil-burn issue of regular 2-strokes, as no oil is used in the fuel
=Free-Piston=
*https://en.m.wikipedia.org/wiki/Free-piston_engine
*Hydraulic version - Innas makes a Free-Piston hydraulic engine -[https://www.innas.com/phone/free-piston-engines.html]

Latest revision as of 19:42, 1 October 2023

Design Considerations

  • Potential for Hydrogen operation - [1]
  • In July 2021, Cummins was awarded an $87M contract by the United States Army to complete the development of the Advanced Combat Engine (ACE), a modular and scalable diesel engine solution that uses opposed-piston technology. [2]
  • Typical 4 stroke fuel-specific oil consumption is .1 percent, and opposed piston engines need to match this to be competitive [3]
  • Oil scraper rings are used on outboard side in opposed-piston engines [4]
  • Texturing of bore is i.portant. plateaus work better. Laser etch adds more retention. See above link.

OSE Proposal for Hydrogen Hydraulic Engine

  • Piston-ported exhaust, air bearing-piston, with overhead valve with direct hydraulic pumping on the opposite side, with pilot-flow cylinder return. May need Hydraulic Accumulator for smoothing.
  • Lubrication is via hydraulic fluid, which addresses the lubrication and oil-burn issue of regular 2-strokes, as no oil is used in the fuel

Free-Piston

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