THE INFLUENCE OF HYDROGEN ADDITION TO THE AIR-FUEL MIXTURE ON OTTO ENGINE COMBUSTION

Experimental results are reported concerning the effect of adding hydrogen to the air-fuel mixture in a single-cylinder internal combustion engine operating in the unthrottled state. It was demonstrated that a sufficiently high combustion rate is possible with a very lean mixture without throttling, if hydrogen is added to the intake air. Part load efficiencies were found to be 20% to 25% higher than corresponding values during conventional throttling. There was an improvement in the exhaust emissions of hydrocarbons (HC), nitrogen oxide (NO), and carbon monoxide (CO). Theoretical calculations are presented to explain the high efficiencies during lean operation: the dependence of combustion duration, and HC, CO, and NO concentrations on equivalence ratio; the temperature of the burnt or unburnt gas and concentration of atomic oxygen in the burnt gas as a function of crank angle; and delay time of methane-air and methane-hydrogen-air mixtures as a function of equivalence ratio.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/01487191
• Supplemental Notes:
  • Presented at SAE Passenger Car Meeting, Dearborn, Michigan, 11-15 June 1979. Research sponsored in part by Federal Minister of Research and Technology (Federal Republic of Germany).
• Corporate Authors:

  Society of Automotive Engineers (SAE)

  400 Commonwealth Drive
  Warrendale, PA  United States  15096
• Authors:
  • Jordan, W
• Publication Date: 1979

Media Info

• Features: References;
• Pagination: 11 p.
• Serial:
  • SAE Technical Paper
  • Publisher: Society of Automotive Engineers (SAE)
  • ISSN: 0148-7191
  • EISSN: 2688-3627
  • Serial URL: http://papers.sae.org/

Subject/Index Terms

• TRT Terms: Combustion; Economic efficiency; Exhaust gases; Fuel air mixtures; Hydrogen; Internal combustion engines; Lean fuel mixtures; Otto cycle engines
• Uncontrolled Terms: Efficiency
• Subject Areas: Economics; Safety and Human Factors;

Filing Info

• Accession Number: 00387295
• Record Type: Publication
• Source Agency: National Highway Traffic Safety Administration
• Report/Paper Numbers: SAE 790678, HS-029 339U
• Files: HSL, USDOT
• Created Date: Jul 30 1984 12:00AM