Models<\/p>\n
- \n
- Energy equation on<\/li>\n
- k-e realizable turbulence model<\/li>\n
- Species transport, 66 step, 31 species chemkin file for ethanol reaction and thermo properties (it is using units CAL\/MOL. Do I need manual unit conversion?) \n
- \n
- eddy dissipation, relax to chemical equilibrium<\/li>\n<\/ul>\n<\/li>\n
- DPM settings\n
- \n
- Interact with continous phase on<\/li>\n
- unsteady particle tracking on<\/li>\n
- update dpm sources every flow iteration on, iterations set to 1<\/li>\n
- Max number of tracking steps set to 50,000<\/li>\n
- particle time step set to 1e-6<\/li>\n
- stochastic collision, breakup, volume displacement, two-way turbulence coupling on<\/li>\n<\/ul>\n<\/li>\n
- DPM injections, some of which are angled to impinge (start time 0, stop time 999999999). All positioned -.0001 below surface in order to make sure all particles end up in domain \n
- \n
- 25 multicomponent plain oriface atomizers with 10 steams \n
- \n
- 75% c2h5oh<\/li>\n
- 25% h2o<\/li>\n
- Temp=400k<\/li>\n
- location, diameter, length, mass flow rate taken from real injector<\/li>\n
- vapor pressure 50 psi<\/li>\n
- A=4.9, radius of curvature=1e-5, 0-360 angle (all left unchanged)<\/li>\n<\/ul>\n<\/li>\n
- 16 droplet plain oriface atomizer with 10 streams\n
- \n
- 100% Lox<\/li>\n
- Temp=90k<\/li>\n
- location, diameter, length, mass flow rate taken from real injector<\/li>\n
- vapor pressure is 14psi<\/li>\n
- A=4.9, radius of curvature=1e-5, 0-360 angle (all left unchanged)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n
- Chemkin mechanism mixture set to ideal gas in order to model compressible flow<\/li>\n
- Boundary conditions\n
- \n
- No inlets (all material injected using DPM)<\/li>\n
- Pressure outlet set to no backflow, DPM escape<\/li>\n
- Wall set to trap to help particles evaporate<\/li>\n<\/ul>\n<\/li>\n
- Initialized at 300 psi expected operating pressure<\/li>\n
- Patched chamber to 2500k for ignition<\/li>\n<\/ul>\n
<\/p>\n
As I mentioned, the particles seem to build instead of evaporating. In this photo you can see there is 74 million particles, despite having a simple geometry with only 570 total streams
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- 25 multicomponent plain oriface atomizers with 10 steams \n