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Oil Droplet Impact Dynamics in Aero-Engine Bearing Chambers-Correlations Derived from Direct Numerical Simulations.
Annotation
| Clasificación: | Libro Electrónico |
|---|---|
| Autor principal: | |
| Formato: | Electrónico eBook |
| Idioma: | Inglés |
| Publicado: |
Berlin :
Logos Verlag Berlin,
2015.
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| Colección: | Forschungsberichte Aus Dem Institut Für Thermische Strömungsmaschinen Ser.
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| Temas: | |
| Acceso en línea: | Texto completo |
Tabla de Contenidos:
- Intro; 1 Introduction; 2 State of Scientific Knowledge; 2.1 Parameter of Influence describing the Drop Impact Dynamics; 2.2 Non-Dimensional Quantities describing the Drop Impact Dynamics; 2.3 Drop-to-Film Interaction in Aero-Engine Bearing Chambers; 2.4 Phenomenological Description of the Impingement Regimes; 2.5 Transitional Regime Thresholds between Spreading and Splashing; 2.6 Secondary Droplet Generation within the Splashing Regime; 2.6.1 Crown and Cavity Evolution in the Splashing Regime; 2.6.2 Theory of Instability Driving the Break up of the Crownâ#x80;#x99;s Rim.
- 2.6.3 Secondary Drop Characteristics during the Drop Impact2.7 Numerical Simulation of the Single Drop Impact onto Liquid Films; 2.8 Modelling Spray Impact; 2.9 Concretization of Objectives and Aim of Investigation; 3 Numerical Method and CFD Modelling of Single Drop Impacts; 3.1 Mathematical Method
- Volume-Of-Fluid Method; 3.2 Numerical Solution Procedure; 3.2.1 Discretization Procedure; 3.2.2 Pressure-Velocity Coupling; 3.2.3 Adaptive Mesh Refinement; 3.3 Computational Domain and Initial/Boundary Conditions; 3.3.1 2D-VOF-AMR
- Numerical Model for Crown and Cavity Expansion.
- 3.3.2 3D-VOF-AMR
- Numerical Model for Splashing3.4 Concluding Discussion; 4 Experimental Validation of the VOF-AMR Method; 4.1 Experimental Method; 4.2 Results and Discussion; 4.2.1 Study of the Transitional Threshold between Spread and Splash; 4.2.2 Assessment of the 3D-VOF-AMR Method; 4.2.3 Assessment of the Axisymmetric 2D-VOF-AMR Method; 4.3 Concluding Discussion; 5 Products of Splashing Drop Impingements without Wall Effects; 5.1 Fundamental Description of a Splashing Impingement; 5.2 Analysis of the Instability driving the Disintegration of the Crown.
- 5.3 Evaluation Procedure for the Following Parametric Study5.4 Effect of the Impinging Weber number; 5.5 Effect of the Froude number Fr; 5.6 Effect of the Impinging Ohnesorge Number; 5.7 Effect of the Impingement Angle a; 5.8 Concluding Discussion; 6 Products of Splashing Drop Impingements with Wall Effects; 6.1 Cavity Penetration during Deep Pool Drop Impact; 6.1.1 Fundamental Description of the Cavity Evolution; 6.1.2 Effect of the Froude Number on the Cavity Penetration; 6.1.3 Effect of the Impinging Weber number on the Cavity Penetration.
- 6.1.4 Effect of the Ohnesorge Number on the Cavity Penetration6.1.5 Effect of Impingement Angle on the Cavity Penetration; 6.2 Effect of Cavity Penetration & Liquid Film Height on the Secondary Drop Generation; 6.2.1 Relation between Cavity Penetration and Lamella Expansion; 6.2.2 Effect of the Ratio H*/ Delta max, deep on Secondary Drop Generation; 7 Correlations for the Products of Splashing; 7.1 Requirements for the Drop-Film Interaction Model; 7.2 Correlations for the Maximum Cavity Penetration and the Lamella Rim Height.