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A Vapour Pressure Model for Methanol/Gasoline M85 Blends
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English
Abstract
This paper presents an analytical model for M85 volatility behaviour. It uses a recently developed technique, for gasoline volatility in conjunction with a modified form of Raoult's Law corrected for non-ideality. Vapour pressure, methanol/gasoline distribution in the vapour phase and enthalpy of evaporation are all calculated using explicit equations.
Constants needed for the equations are given for one M85 blend and a simple method of deriving them for any other gasoline/methanol mixture using only measured RVP is outlined.
In addition to describing the new predictive technique, the paper gives the results of an experimental program in which vapour phase composition and vapour pressure behaviour were measured at various temperatures and vapour/liquid ratios. Agreement between predicted and measured results is good.
The new model is used to explain the observation that M85 having the same RVP as gasoline gives poorer cold starting performance.
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Authors
- M.F. Bardon - Department of Mechanical Engineering, Royal Military College of Canada, Kingston, Ontario, Canada
- G.W. Nicks - Department of Mechanical Engineering, Royal Military College of Canada, Kingston, Ontario, Canada
- V.K. Rao - Department of Mechanical Engineering, Royal Military College of Canada, Kingston, Ontario, Canada
- R. Vaivads - Department of Mechanical Engineering, Royal Military College of Canada, Kingston, Ontario, Canada
Citation
Bardon, M., Nicks, G., Rao, V., and Vaivads, R., "A Vapour Pressure Model for Methanol/Gasoline M85 Blends," SAE Technical Paper 870366, 1987, https://doi.org/10.4271/870366.Also In
References
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- Furey R.L. Nagel B.E. “Composition of Vapor Emitted from a Vehicle Gasoline Tank during Refueling” SAE paper # 860086 Society of Automotive Engineers' 1986 International Congress and Exposition Detroit Feb. 24-28, 1986
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- Bardon M.F. Rao V.K. “Calculation of Gasoline Volatility” J. Inst. Energy 57 343 348 Sept. 1984
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- “Distillation of gasoline, naphtha, kerosine an similar petroleum products” Test D86 American Society for Testing and Materials Philadelphia 1978
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- Bardon M.F. Gardiner D.P. Rao V.K. “Cold Starting Performance of Gasoline/Methanol M10 Blends in a Spark Ignition Engine” SAE paper # 850214 Society of Automotive Engineers International Congress and Exposition Detroit Feb 25 - Mar 1, 1985