Status – Validation of Eulerian Spray Modelling University of Zagreb Faculty of Mechanical Engineering and Naval Architecture Department of Energy, Power.

Status – Validation of Eulerian Spray Modelling University of Zagreb Faculty of Mechanical Engineering and Naval Architecture Department of Energy, Power Engineering and Environment Chair of Power Engineering and Energy Management Milan Vujanovic May, 2006

Validation: I-Level project Version v8.5006 vs. Version v8.5014 Nozzle D – 205 micron diameter Rail pressure – 500 bar Gas chamber pressure – 72 bar Gas temperature in chamber - 900 K

Test Case - Nozzle D – 205 micron diameter Experimental data – injection rate: PointRailpressure Gas chamber pressureTemperature 4500 bar72 bar900 K

Calculation settings Upto Time [s] Δt upto 1.0e-6 2.5e-08 upto 1.0e-4 2.5e-07 upto 2.0e-4 5.0e-07 upto 0.0026 1.0e-06 Time discretisation: The liquid → Diesel → T=373 K Eulerian spray with 6 phases Primary brake-up model: Dies.Core Injection Secondary brake-up model: Wave model Evaporation model: Abramzon-Sirignano model Turbulent dispersion coefficient = 6 PhaseFluidClass diametre [m] 1gas 2droplet5e-0.6 3droplet1e-0.5 4droplet2e-0.5 5droplet4e-0.5 6droplet0.000205

PointRailpressure Gas chamber pressure Temperature 4500 bar72 bar900 K Penetration for liquid phase and vapour phase compared with experimental results Penetration for liquid phase and vapour phase compared with experimental results 8.5014 8.5006

Validation: I-Level project Impact of initial k and epsilon values Nozzle D – 205 micron diameter Rail pressure – 500 bar Gas chamber pressure – 72 bar Gas temperature in chamber - 900 K Case 1_1 Turb. kin. energy – 10 m 2 /s 2 Turb. length scale – 2e-05 m Turb. diss. rate – 259 808 m 2 /s 3 Case 6_1 Turb. kin. energy – 250 m 2 /s 2 Turb. length scale – 2e-05 m Turb. diss. rate – 3.247e+07 m 2 /s 3

PointRailpressure Gas chamber pressure Temperature 4500 bar72 bar900 K Penetration for liquid phase and vapour phase compared with experimental results Penetration for liquid phase and vapour phase compared with experimental results Case 1_1 Turb. kin. energy – 10 m 2 /s 2 Turb. length scale – 2e-05 m Turb. diss. rate – 259 808 m 2 /s 3 Case 6_1 Turb. kin. energy – 250 m 2 /s 2 Turb. length scale – 2e-05 m Turb. diss. rate – 3.247e+07 m 2 /s 3

Validation: I-Level project Impact of constant c ε2 Nozzle D – 205 micron diameter Rail pressure – 500 bar Gas chamber pressure – 72 bar Gas temperature in chamber - 900 K The constant c ε2 in the transport equation for the dissipation rate of the turbulent kinetic energy was set to c ε2 = 1.8 instead c ε2 =1.92

PointRailpressure Gas chamber pressure Temperature 4500 bar72 bar900 K Penetration for liquid phase and vapour phase compared with experimental results Penetration for liquid phase and vapour phase compared with experimental results c ε2 =1.92 c ε2 =1.8

Calculation settings Upto Time [s] Δt upto 1.0e-6 2.5e-08 upto 1.0e-4 2.5e-07 upto 2.0e-4 5.0e-07 upto 0.0026 1.0e-06 / 5.0e-07 Time discretisation: The liquid → Diesel → T=373 K Eulerian spray with 6 phases Primary brake-up model: Dies.Core Injection Secondary brake-up model: Wave model Evaporation model: Abramzon-Sirignano model Turbulent dispersion coefficient = 6 PhaseFluidClass diametre [m] 1gas 2droplet5e-0.6 3droplet1e-0.5 4droplet2e-0.5 5droplet4e-0.5 6droplet0.000205

Calculation settings Upto Time [s] Δt upto 1.0e-6 2.5e-08 upto 1.0e-4 2.5e-07 upto 2.0e-4 5.0e-07 upto 0.0026 5.0e-07 Time discretisation: The liquid → Diesel → T=373 K Eulerian spray with 6 phases Primary brake-up model: Dies.Core Injection Secondary brake-up model: Wave model Evaporation model: Abramzon-Sirignano model Turbulent dispersion coefficient = 4.5 PhaseFluidClass diametre [m] 1gas 2droplet5e-0.6 3droplet1e-0.5 4droplet2e-0.5 5droplet4e-0.5 6droplet0.000205

Validation: I-Level project k – zeta – f turbulence model Nozzle D – 205 micron diameter Rail pressure – 500 bar Gas chamber pressure – 72 bar Gas temperature in chamber - 900 K

PointRailpressure Gas chamber pressure Temperature 4500 bar72 bar900 K Penetration for liquid phase and vapour phase compared with experimental results Penetration for liquid phase and vapour phase compared with experimental results k – epsilon k –zeta - f

Validation: I-Level project k – zeta – f turbulence model Nozzle D – 205 micron diameter Rail pressure – 1200 bar Gas chamber pressure – 54 bar Gas temperature in chamber - 900 K

PointRailpressure Gas chamber pressure Temperature 41200 bar54 bar900 K Penetration for liquid phase and vapour phase compared with experimental results Penetration for liquid phase and vapour phase compared with experimental results k – epsilon k –zeta - f

Validation: I-Level project Calculation with nozzle interface Coupling internal nozzle flow simulation and initialisation of spray calculation Nozzle D – 205 micron diameter Rail pressure – 500 bar Gas chamber pressure – 72 bar Gas temperature in chamber - 900 K Using the data of the two phase flow calculation inside the nozzle as a start and boundary condition for Eulerian spray calculation

PointRailpressure Gas chamber pressure Temperature 4500 bar72 bar900 K Penetration for liquid phase and vapour phase compared with experimental results Penetration for liquid phase and vapour phase compared with experimental results without nozzle interface with nozzle interface

Validation: I-Level project Calculation with nozzle interface Coupling internal nozzle flow simulation and initialisation of spray calculation Nozzle D – 205 micron diameter Rail pressure – 1200 bar Gas chamber pressure – 72 bar Gas temperature in chamber - 900 K Using the data of the two phase flow calculation inside the nozzle as a start and boundary condition for Eulerian spray calculation

PointRailpressure Gas chamber pressure Temperature 41200 bar72 bar900 K Penetration for liquid phase and vapour phase compared with experimental results Penetration for liquid phase and vapour phase compared with experimental results without nozzle interface with nozzle interface

The end The end University of Zagreb Faculty of Mechanical Engineering and Naval Architecture Department of Energy, Power Engineering and Environment Chair of Power Engineering and Energy Management

Nozzle D – 205 micron diameter Experimental data – injection rate: Experimental data – injection rate: PointsRailpressure Gas chamber pressureTemperature 1500 bar54 bar900 K 2800 bar54 bar900 K 31200 bar54 bar900 K 4500 bar72 bar900 K 5800 bar72 bar900 K 61200 bar72 bar900 K 2 nd phase of validation: I-Level project

Test Case: I-Level project Nozzle D – 205 micron diameter Experimental data – injection rate:

Status – Validation of Eulerian Spray Modelling University of Zagreb Faculty of Mechanical Engineering and Naval Architecture Department of Energy, Power.

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Status – Validation of Eulerian Spray Modelling University of Zagreb Faculty of Mechanical Engineering and Naval Architecture Department of Energy, Power.

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Presentation on theme: "Status – Validation of Eulerian Spray Modelling University of Zagreb Faculty of Mechanical Engineering and Naval Architecture Department of Energy, Power."— Presentation transcript:

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