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A Method for Calculating the Exhaust Port Area for Two-Stroke Cycle Engines

Published online by Cambridge University Press:  28 July 2016

R. S. Benson
R. S. Benson*
Affiliation:
University of Liverpool
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Extract

The design of the exhaust ports of a two-stroke cycle engine is mainly based on the area required to reduce the cylinder pressure at the end of the expansion stroke to scavenge air pressure in the minimum practicable time. The flow through the exhaust ports is both sonic and subsonic; in the former case the flow is independent of the exhaust pipe conditions but not in the latter case. In the first stage of the design, however, the exhaust pipe conditions may be assumed to be constant when calculating the port area, subsequent calculations of the pressure drop allowing for the pipe size may then be made by the methods suggested by Wallace, Cole, or Benson. In the following Note formulae are developed for estimating the port area neglecting the exhaust pipe size.

Type
Technical Notes
Information
The Aeronautical Journal , Volume 61 , Issue 554 , February 1957 , pp. 127 - 130
Copyright
Copyright © Royal Aeronautical Society 1957

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References

1. Wallace, F. J. and Nassiff, M. H. (1954). Air Flow in a Naturally Aspirated Two Stroke Engine. Proceedings of the Institution of Mechanical Engineers, Vol. 168, p. 515, 1954.Google Scholar
2. Cole, B. N. and Mills, B. (1952-53). Theory of Sudden Enlargements Applied to Poppet Exhaust Valve, with Special Reference to Exhaust Pulse Scavenging. Proceedings of the Institution of Mechanical Engineers, Vol. 1B. No. 8, p. 364, 1953.Google Scholar
3. Benson, R. S. (1955). The Effect of Excess Scavenge Air on the Pressure Drop in the Cylinder of a Two Stroke Cycle Engine During Exhaust Blowdown. Journal of the Royal Aeronautical Society, Vol. 59, pp. 773-8, 1955Google Scholar