Abstract
Alcohol fuels have been considered for use as automotive fuel since two energy crises in the 1970's, but they have a defect of high latent heat of vaporization. Therefore, in order to improve vaporization of methanol, the authors have made the fuel vaporizing device with which to heat the mixture and eliminate the fuel film flow. This paper is a study on the characteristics of vaporization and engine performance acoording to the change of heating water temperature by means of the fuel vaporizing device. The study shows that as the vaporization of mixture improves, the mixture of methanol becomes homogenized and the fuel film flow decreases, which results in the increase of vaporization rate. And the increase of the vaporization rate improves the engine performance of the alcohol-fueled spark ignition engine.
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Abbreviations
- A a :
-
Area per unit length
- A m :
-
Area per unit length mesh
- C p :
-
Specific heat at constant pressure
- D :
-
Diameter of inlet pipe
- d :
-
Diameter of a mesh inlet pipe
- G f :
-
Mixture flow of vapor
- G s :
-
Mixture flow of droplet
- G w :
-
Mixture flow of liquid
- h :
-
Heat transfer coefficient
- K :
-
Thermal conductivity
- L a :
-
Length of the FVD
- M :
-
Mass
- N :
-
Engine speed
- Pr :
-
Prandtl number
- Q :
-
Heat transfer rate
- Q h :
-
Heat quantity of mixture
- R af :
-
Air fuel ratio
- R e :
-
Reynolds number
- T :
-
Temperature
- T b :
-
Bulk temperature
- T w :
-
Wall temperature
- V d :
-
Displacement volume
- V :
-
Velocity
- X e :
-
Vaporization rate
- γ:
-
Specific weight
- δ:
-
Interval of a mesh
- η υ :
-
Volumetric efficiency
- θ:
-
Crank angle
- ρ a :
-
Density of air
- ϕ:
-
Equivalence ratio
- ρ:
-
Density
- a :
-
Air
- f :
-
Fuel
- i :
-
i'th component
References
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Han, S.B., Mun, S.S. & Lee, S. Vaporization characteristics of the alcohol-fueled spark ignition engine. KSME Journal 8, 241–247 (1994). https://doi.org/10.1007/BF02953352
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DOI: https://doi.org/10.1007/BF02953352