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Advanced Simulation Techniques for IC Engines

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ava-herman
80 diapositives · 1.1K Views · Nov 18, 2014

ASTICE. Advanced Simulation Techniques for IC Engines. CFD- 3D general flow analysis. Application. Engine Cycle Simulation. Engine Cycle Simulation-Case 1. Weibe combustion model. Engine Cycle Simulation-Case 1. Single DI Weibe. Start of combustion  Crank angle at 1% burned.

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Advanced Simulation Techniques for IC Engines
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  1. ASTICE Advanced Simulation Techniques for IC Engines

  2. CFD- 3D general flow analysis Application

  3. Engine Cycle Simulation

  4. Engine Cycle Simulation-Case 1 Weibe combustion model

  5. Engine Cycle Simulation-Case 1 Single DI Weibe Start of combustion Crank angle at 1% burned Weibe combustion model Fit Weibe function to experimental or CFD heat release • Combustion Duration & Weibe exponent • Calculated by non-linear least square method Start of combustion Crank angle at 0.5% burned Multiple DI Weibe • Premixed fraction, Premixed combustion duration , premixed Weibe exponent, mixing controlled combustion duration and mixing controlled Weibe exponent • Calculated by non-linear least square method

  6. Engine Cycle Simulation-Case 1 Single Weibe Model SOC = -5.3 Θd= 63.5 M = 0.96 Multiple Weibe Model SOC = -4.1 Pf = 0.1 Θd_p= 12 Mp = 0.5 Θd_p= 60 Mp = 1.15

  7. Engine Cycle Simulation-Case 1

  8. Engine Cycle Simulation-Case 1

  9. Engine Cycle Simulation-Case 1

  10. Engine Cycle Simulation-Case 1 Single Cylinder results Zoom

  11. Engine Cycle Simulation-Case 1 Single Cylinder results Scavenging

  12. Engine Cycle Simulation-Case 1 Single Cylinder results Fuel Energy 196.8 kW

  13. Engine Cycle Simulation-Case 1 Single Cylinder Model Firing Order/ No. Cylinders TC and IC model Filling & Emptying Model Friction Model

  14. Engine Cycle Simulation-Case 1 Filling & Emptying Model

  15. Engine Cycle Simulation-Case 1 Gas Exchange Diagram Filling & Emptying Results

  16. Engine Cycle Simulation-Case 1 Filling & Emptying Model Results Compressor Raw Map Turbine Raw Map

  17. Engine Cycle Simulation-Case 2 Multi-zone spray Model for Diesel combustion More info: SAE paper No. 2001-01-1246

  18. Engine Cycle Simulation-Case 2 Multi-zone spray Model for Diesel combustion

  19. Engine Cycle Simulation-Case 2 Multi-zone spray Model for Diesel combustion Start of Combustion Premixed combustion Temperature Distribution in Spray Zones

  20. Engine Cycle Simulation-Case 2 Multi-zone spray Model for Diesel combustion Combustion tale Peak heat release rate Temperature Distribution in Spray Zones

  21. Engine Cycle Simulation-Case 2 Multi-zone spray Model for Diesel combustion NOx & SOOT Fuel evaporation & Burn

  22. Engine Cycle Simulation-Case 2 Multi-zone spray Model for Diesel combustion Pressure & Temperature NormalizedFuel Injection, Evaporation, Burn and Heat release rate

  23. Engine Cycle Simulation-Case 3 Two-Zone knock model for SI and DF engine

  24. Engine Cycle Simulation-Case 3 Two-Zone knock model for SI and DF engine The Unburned Zone The Burned Zone CO CO H2O H2O CHO O CH4 O2 HO2 O2 CO2 N2 OH H2O2 CH3 OH N2 H H H2 CH2O Chemical Kinetics Thermodynamic Equilibrium Auto-ignition  Knock Heat Release

  25. Engine Cycle Simulation-Case 3 Two-Zone knock model for SI and DF engine

  26. Engine Cycle Simulation-Case 3 Two-Zone knock model for SI and DF engine Model Validation Continuous lines : Two-Zone model results Points : CAT Engine simulation results (SAE paper)

  27. Engine Cycle Simulation- Case 4 • 1D gas dynamic model 1D CFD Complex program Better Results Filling & Emptying Modeling

  28. Engine Cycle Simulation- Case 4 • 1D gas dynamic model Two-Step lax-Wendroff method Flow Limit Function

  29. Engine Cycle Simulation- Case 4 1D gas dynamic model

  30. Engine Cycle Simulation- Case 5 • Turbocharger Matching Criteria for turbo matching

  31. Engine Cycle Simulation- Case 5 • Turbocharger Matching/ Transient operation Load Increase Process

  32. Engine Cycle Simulation- Case 5 • Turbocharger Matching/ Transient operation 150 Sec Ramp of Throttle from 0-100-Transient Response

  33. Engine Cycle Simulation- Case 5 • Turbocharger Matching/ Transient operation 150 Sec Ramp of Throttle from 0-100-Transient Response

  34. Engine Cycle Simulation- Case 5 • Turbocharger Matching/ Transient operation 40 Sec Ramp of Throttle from 0-100-Transient Response

  35. Engine Cycle Simulation- Case 5 • Turbocharger Matching/ Transient operation 40 Sec Ramp of Throttle from 0-100-Transient Response

  36. Engine Cycle Simulation- Case 5 • Turbocharger Matching/ Transient operation 12 Sec Ramp of Throttle from 0-100-Transient Response

  37. Engine Cycle Simulation- Case 5 • Turbocharger Matching/ Transient operation 12 Sec Ramp of Throttle from 0-100-Transient Response

  38. Optimization Process RSM Methodology

  39. Optimization Model- RSM

  40. Optimization Model- DOE

  41. Optimization Model- DOE Methods Increase in Run time Increase in Level of Accuracy

  42. Optimization Example 1 Injection timing VS Speed & fuel amount Response Surfaces

  43. Optimization Example 1 Injection timing VS Speed & fuel amount Optimized Map

  44. Cooling circuit simulation

  45. Cooling circuit simulation-Case 1 • Simple and Extended model of Heat exchanger Simple Model

  46. Cooling circuit simulation-Case 1 • Simple and Extended model of Heat exchanger Extended Model

  47. Cooling circuit simulation-Case 1 • Simple and Extended model of Heat exchanger

  48. Cooling circuit simulation-Case 2 • Coupled Solution with Engine Cycle Simulation/ Transient/ Extended pump model Heat transfer BCs Heat Rejection

  49. Cooling circuit simulation-Case 2 • Coupled Solution with Engine Cycle Simulation/ Transient/ Extended pump model Transient Operation of the engine

  50. Cooling circuit simulation-Case 2 • Coupled Solution with Engine Cycle Simulation/ Transient/ Extended pump model Transient Operation of the engine