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May 10, 2016, 03:27 |
Modeling ICE ignition
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#1 |
New Member
AboAhmad
Join Date: Jul 2014
Location: DSCU
Posts: 7
Rep Power: 11 |
بسم الله الرحمن الرحيم
During simulation of In-Cylinder ICE (2000 RPM) problem. when selecting(Finite-Rate/Eddy-Dissipation) in Species Reaction model Mixture material -> n-heptane-air (5 volumetric species) Entering the inlet boundary condition Intake -> Pressure inlet = 0 guage Species -> C7H16 = 0.0621 , O2=0.2186 (which is the stoich. mass fraction) also, activating the Spark Ignition Model Model -> fixed Spark Size Shape Parametrs -> (X,Y) =(0,0), r = 0.001 m Model Parameters -> Energy=0.1 J Start degree = 700 deg Duration =0.001 s Diffusion Time=1e-5 s I find that the reaction does not occurs unless assigning the Spark Energy exceeds 1000 J Is this value of spark energy is true? In fluent user guide the Energy=0.1 J In (Stephen RTurns - An Intrduction to Combustion) Table 8.5 P294 for n-Heptane at 298K the Eign = 14.5 milli J The question is Why this great ratio between actual and theoretical Eign which exceeds 10^4. thanks for any one answers me |
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