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Cost, Effectiveness, and Deployment of Fuel Economy Technologies for Light-Duty Vehicles (2015) / Chapter Skim
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Appendix N: Effect of Compression Ratio of Brake Thermal Efficiency
Pages 401-401

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From page 401...
... (1) These figures provide the following insight into the effects Where:  CR = compression ratio of compression ratio on brake thermal efficiency:    = ratio of constant pressure to con k stant volume specific heats •  t full load, brake thermal efficiency increases, but at A a decreasing rate, with increasing compression ratio, Equation 1 shows that indicated thermal efficiency increases, similar to indicated thermal efficiency.
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Key Terms

  • compression ratio
  • brake thermal
  • indicated thermal
  • mechanical efficiency
  • efficiency increases

  • increasing compression
  • cafe test
  • figures provide
  • efficiency decreases
  • decreasing rate

  • typical level
  • turbocharged efficiency
  • cal efficiency
  • gasoline octane
  • following insight

  • estimated constant
  • regular grade
  • volume specific
  • rally aspirated
  • stant volume

  • friction levels
  • ratio beyond
  • mean effective
  • constant friction
  • fuel consumption

  • aspirated engines
  • specific heats
  • test cycles
  • grade gasoline
  • increasing gasoline


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