UNSTEADY GAS FLOW THROUGH REED VALVE INDUCTION SYSTEMS (TWO-CYCLE ENGINES)

It is possible to predict the unsteady gas flow behavior and the performance and noise characteristics in a naturally aspirated two-cycle engine. A mathematical model has been formulated to simulate the action of the two-cycle engine fitted with a reed valve due to unsteady gas dynamic behavior in the inlet tract. A complete computer simulation of a two-cycle engine fitted with a reed intake valve is thus possible. The mathematical model of a cantilever beam vibrating in the first three modes, as applied to the two-cycle engine reed valve and employing a completely theoretical forcing function, is particularly advantageous in view of the fact that a subsequent mathematical model formulated to predict reed behavior in the simulator could do so accurately for milder forcing pressures than would be experienced in the firing two-cycle engine. The complete program for a reed valve two-cycle engine will provide a significant design tool and will effect savings in development time and costs. The complete program predicts all noise and performance characteristics and will include reed petal motion. Designed elements will be petal length, width, thickness, inclination, and number for a given petal material.

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  • Supplemental Notes:
    • Presented at SAE Off-Highway Vehicle Meeting and Exposition, Milwaukee, Wisconsin, 11-14 September 1978. Supported by Yamaha Motor (Japan), Ossa, and Bultaco (Spain), Mercury Marine, O.M.C. (U.S.), Bombardier-Rotax (Austria) and Greeves (England).
  • Corporate Authors:

    Society of Automotive Engineers (SAE)

    400 Commonwealth Drive
    Warrendale, PA  United States  15096
  • Authors:
    • Hinds, E T
    • Blair, G P
  • Publication Date: 1978

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Subject/Index Terms

Filing Info

  • Accession Number: 00399015
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: SAE 780766, HS-025 583U
  • Files: HSL, USDOT
  • Created Date: Aug 31 1985 12:00AM