A Model for Multicomponent Spray Vaporization in a High-Pressure and High-Temperature Environment

A multicomponent droplet vaporization model including both gas and liquid phase transport processes was developed for multidimensional spray computations. This paper focuses on two effects altering vaporisation in a high-pressure and high-temperature environment. One effect is on droplet surface regression caused by a higher vaporization rate. This effect is well characterized by the Lewis number and the Peclet number with the regression velocity. Formulas based on the two numbers were included to improve model accuracy. The other effect is on the nonideal behavior arid was covered in the model by using the Peng-Robinson equation of state to determine phase equilibrium at the droplet surface. The model was validated by the results from an accurate simplified vortex model and experimental measurements, and excellent agreements were demonstrated. Further comparisons against the model without the two effects and an infinite diffusion model show that significant improvement was achieved by the model for single-droplet and spray computations.

[1]  W. Sirignano,et al.  Multicomponent droplet vaporization in a high temperature gas , 1984 .

[2]  W. Sirignano,et al.  Multicomponent Transient Droplet Vaporization with Internal Circulation: Integral Equation Formulation and Approximate Solution , 1986 .

[3]  J. Abraham,et al.  A Model for Multicomponent Droplet Vaporization in Sprays , 1998 .

[4]  A. A. Amsden,et al.  KIVA-3V: A Block-Structured KIVA Program for Engines with Vertical or Canted Valves , 1997 .

[5]  Yangbing Zeng.  Modeling of Multicomponent Fuel Vaporization in Internal Combustion Engines , 2000 .

[6]  Hiroyuki Hiroyasu,et al.  Evaporation of a Single Droplet at Elevated Pressures and Temperatures : 2nd Report, Theoretical Study , 1976 .

[7]  Xianguo Li,et al.  A Droplet Vaporization Model for Spray Calculations , 1992 .

[8]  Chung King Law,et al.  Multicomponent droplet combustion with rapid internal mixing , 1976 .

[9]  Shwin-Chung Wong,et al.  Internal temperature distributions of droplets vaporizing in high-temperature convective flows , 1992, Journal of Fluid Mechanics.

[10]  W. Sirignano,et al.  Droplet vaporization model for spray combustion calculations , 1989 .

[11]  Chung King Law,et al.  Recent advances in droplet vaporization and combustion , 1982 .

[12]  X. Chesneau,et al.  Comparison of multicomponent fuel droplet vaporization experiments in forced convection with the Sirignano model , 1998 .

[13]  U. Renz,et al.  An Improved Model to Describe Spray Evaporation Under Diesel-Like Conditions , 1996 .

[14]  Chung King Law,et al.  Internal boiling and superheating in vaporizing multicomponent droplets , 1978 .

[15]  S. Aggarwal,et al.  Multicomponent and single-component fuel droplet evaporation under high pressure conditions , 1998 .

[16]  R. A. White,et al.  Multicomponent liquid and vapor fuel measurements in the cylinder of a port-injected, spark ignition engine , 1998 .

[17]  Rolf D. Reitz,et al.  MULTIDIMENSIONAL MODELING OF FUEL EFFECTS AND SPLIT INJECTIONS ON DIESEL ENGINE COLD-STARTING , 1997 .

[18]  G. L. Borman,et al.  A Model for Multicomponent Droplet Vaporization at High Ambient Pressures , 1985 .

[19]  W. Sirignano,et al.  Numerical modeling of a vaporizing multicomponent droplet , 1991 .

[20]  Rolf D. Reitz,et al.  Modeling of Multicomponent Fuels Using Continuous Distributions with Application to Droplet Evaporation and Sprays , 1997 .