This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Assessments of Multidimensional Diesel Spray Predictions
Annotation ability available
Sector:
Language:
English
Abstract
In this paper a multidimensional method is described and evaluated for the prediction of Diesel sprays. The method, which shares many features with similar approaches developed elsewhere, embodies an Eulerian description of the gas flow and a stochastic Lagrangian treatment of the spray droplets. Gas phase turbulence effects are represented by the k-ε model and their influence on the droplets is modelled stochastically, as are the processes of collision and coalescence. Comparisons are made with the spray penetration measurements in a quiescent bomb of Yule et al [1] covering a range of pressures and temperatures. Satisfactory agreement is obtained at combinations of low pressure and temperature and high pressure and temperature, but not for high-pressure, low-temperature cases. The sensitivity of the predicted penetration rates to the assumed initial droplet size distribution is relatively weak, but the calculated vaporization rates are strongly sensitive. This demonstrates the inadequacy of penetration data as a testing-ground for spray models and points to a need for (a) an atomisation model and (b) vaporization data.
Authors
- K. R. Beshay - Mechanical Engineering Dept., Imperial College of Science and Technology, London, England
- A. D. Gosman - Mechanical Engineering Dept., Imperial College of Science and Technology, London, England
- A. P. Watkins - Mechanical Engineering Dept., Imperial College of Science and Technology, London, England
Topic
Citation
Beshay, K., Gosman, A., and Watkins, A., "Assessments of Multidimensional Diesel Spray Predictions," SAE Technical Paper 861570, 1986, https://doi.org/10.4271/861570.Also In
References
- Yule A J Mo S L Tham S Y Aval S M “Diesel spray structure” Proc ICLASS-85 1985
- Henein N A “Analysis of pollutant formation and control and fuel economy in diesel engines” Prog Energy and Combustion Science 1 165 207 1976
- Bracco F V “Modelling of engine sprays” SAE 850394 1985
- Beshay K R “Computer modelling of diesel spray dispersion and evaporation” PhD Thesis London University 1985
- Jones W P Launder B E “The calculation of low-Reynolds number phenomena with a two-equation model of turbulence” Int J Heat and Mass Transfer 16 1119 1972
- Dukowicz J K “A particle-fluid numerical model for liquid sprays” J of Comp Physics 35 229 233 1980
- O’Rourke P J Bracco F V “Modelling of drop interactions in thick sprays and a comparison with experiments” Stratified Charge Automotive Engines Conference IMechE 1980
- Gosman A D loannides E “Aspects of computer simulation of liquid-fuelled combustors” J of Energy 7 6 482 490 1983
- Borman G L Johnson J H “Unsteady vaporisation histories and trajectories of fuel drops injected into swirling air” SAE 598C National Powerplant Meeting 1962
- Wallis G B One-dimensional two phase flow McGraw Hill 1969
- Ranz W E Marshall W P “Evaporation from drops” Chem Eng Prog 48 3 141 146 1952
- O’Rourke P J “Collective drop effects on vaporising liquid sprays” PhD Thesis Princeton University 1981
- Boulderstone R Ahseng C Yule A J Felton P G Chigier N A “The structure of diesel injector sprays” CARL IM 81-01 1981
- Reitz R D Bracco F V “On the dependence of spray angle and other spray parameters on nozzle design and operating conditions” SAE 790494 1979
- Kuniyoshi H Tanabe H Sato G T Fujimoto H “Investigation on the characteristics of diesel fuel spray” SAE 800968 1980
- Kuo T W “On the scaling of transient laminar, turbulent and spray jets” PhD Thesis Princeton University 1982
- Kuo T W Bracco F V “Computations of drop sizes in pulsating sprays and of liquid core length in vaporising sprays” SAE 820133 1982
- Yule A J Private communication 1986
- Hiroyasu H Kadota T Arai M “Fuel spray characterisation in diesel engines” Combustion Modelling in Reciprocating Engines Amann C A Mattavi J N Plenum Press 1980
- Reitz R D Diwakar R “Effect of drop breakup on fuel sprays” SAE 860469 1986