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Spray-Turbulence Interaction Anne Kösters Ph.D. student.

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Presentation on theme: "Spray-Turbulence Interaction Anne Kösters Ph.D. student."— Presentation transcript:

1 Spray-Turbulence Interaction Anne Kösters Ph.D. student

2 PhD student: Anne Kösters Project start: February 2010 Project finish:November 2014 Financed by: Budget/ year: SEK Spray-Turbulence Interaction

3 Background Diesel Spray T ~ 900 K P gas = 60 bar P inj = 1350 bar Experiments done in Chalmers Spray Rig by Chengjun Du

4 Goal Goal is to investigate spray-turbulence and turbulence- chemistry interaction, and to incorporate the findings into spray combustion models. Implementation and improvement of models to predict spray formation (VSB2) and turbulence-chemistry interaction (VRFM, RIF) in OpenFOAM ® Detailed investigation of Diesel spray behavior and flame structure, maintained by the implemented models Approach

5 Liquid phase CFD solution (gas) Chemistry Modeling of an evaporating spray with combustion Combustion modeling Spray modeling

6 Spray Kösters, A. & Karlsson, A., ”A Comprehensive Numerical Study of Diesel Fuel Spray Formation in OpenFOAM”, SAE Technical Paper, , Journal Paper (submitted to Atomization and Sprays): Kösters, A. and Karlsson, A., ”The VSB2 spray model validated against Spray A and Spray H” Method: VSB2 Spray Model

7 P inj = 1200bar P gas = 30 bar T gas = 500 °C P inj = 1200bar P gas = 70 bar T gas = 500 °C P inj = 600bar P gas = 30 bar T gas = 500 °C P inj = 600bar P gas = 70 bar T gas = 500 °C Experiments: Chalmers HP/HT Spray Rig by Raúl Ochoterena

8 Baseline condition ECN*: liquid penetration vs time Ignition delay (baseline) Flame lift-off *ECN : Engine Combustion Network, results from Workshop 3, Spray A: n-dodecane ρ = 22.8 kg/m 3 ; T = 900 K; p inj = 150 MPa

9 Baseline condition: axial mixture fraction at 1.5 ms Liquid + Vapor region Pure vapor region

10 Combustion + Kösters, A., Golovitchev, V. & Karlsson, A., ”A Numerical Study of the Effect of EGR on Flame Lift-off in n-Heptane Sprays Using a Novel PaSR Model Implemented in OpenFOAM”, SAE International Journal of Fuels and Lubricants, vol. 5 no , May Journal Paper (submitted to Combustion Theory and Modelling): + Kösters, A., Karlsson, A., Oevermann, M., D’Errico, G. and Lucchini, T.,” RANS predictions of turbulent diusion ames: comparison of a reactor and a amelet combustion model to the well stirred approach” *Pitsch, H., Wan, Y.P. & Peters, N. ”Numerical Investigation of Soot Formation and Oxidation Under Diesel Engine Conditions”, SAE Paper , *Peters, N., Turbulent Combustion, Cambridge University Press, Method: WS, VRFM + and mRIF* model

11 mRIFVRFMWS ChemistryY i (Z,t) (decoupled from flow field) Y i (x,y,z,t) Computational costscheaphigh Computational cell reactor Computational cell flamelet Comparison of combustion models 30 flamelets

12 Ignition delay Lift-off length Experiments: ECN data of n-heptane spray combustion (spray H)

13 Ignition delay Lift-off length 10% O 2

14 Combustion T gas = 1000 K, p gas = 42 bar, O 2 = 10 %

15 Summary PhD Project VSB2 spray model implemented in OpenFOAM 1.6.x and 2.0.x VSB2 spray model further developed Validation against experimental data of Chalmers HP/HT Spray Rig Validation against ECN data Comparison with other groups/models within the ECN Further results (sensitivity studies) are published VRFM implemented in OpenFOAM 1.6.x and 2.0.x VRFM further developed Validation against ECN data Detailed comparison to the direct chemistry approach and the multiple RIF model

16 My Future Work Defense of Ph.D. at November 7th Studying and understanding the processes close to the nozzle exit Multi-component evaporation Coupling of premixed and diffusion combustion models (others) Future Work

17 Thank you for your attention

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