Abstract
A quasi-dimensional model is developed with the surrogate mechanism of isooctane and n-heptane to predict knock and emissions of a homogeneous GDI engine. It is composed of unburned and burned zone with the latter divided into multiple zones of equal mass to resolve temperature stratification. Combustion is based on turbulent entrainment and burning in a spherically propagating flame with the entrainment rate interpolated between laminar and turbulent flame speed. Validation is performed against measured pressure traces, NOx and CO emissions at different load and rpm conditions. Comparison is made between predictions by the empirical knock model and the chemistry model in this work. There is good agreement for pressure, NOx, CO and knock for the test engine. Promising results are obtained through parametric study with respect to octane number and engine load by the chemistry knock model.
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Abbreviations
- A :
-
constant for turbulent burning velocity
- C p :
-
specific heat
- D :
-
diffusivity
- d 32 :
-
SMD
- h f :
-
enthalpy of formation
- P v,surf :
-
saturation pressure
- Q chem :
-
heat relrease by knock
- Q fg :
-
heat transfer for evaporation
- Q w :
-
heat transfer on the wall
- R v :
-
gas constant
- S L :
-
laminar flame speed
- S T :
-
turbulent burning velocity
- V e :
-
flame propagation speed
- z i :
-
correction factor
- a :
-
constant for heat transfer
- a, n :
-
constant for flame propagation speed
- λ :
-
thermal conductivity, latent heat of evaporation
- θ :
-
ignintion delay
- b :
-
burnd gas
- f :
-
fuel
- g :
-
gas
- i :
-
i-th spray zone
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Lee, J., Lee, Y., Huh, K.Y. et al. Quasi-dimensional analysis of combustion, emissions and knocking in a homogeneous GDI engine. Int.J Automot. Technol. 16, 877–883 (2015). https://doi.org/10.1007/s12239-015-0089-z
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DOI: https://doi.org/10.1007/s12239-015-0089-z