Jensen M.V. Heat Transfer in Large Two-Stroke Marine Diesel Engines

A thesis submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy, Technical University of Denmark, 2012. 196 p. - ISBN: 978-87-7475-364-3.Abstract
Resumé (Abstract In Danish)
Acknowledgements
List of PublicationsNomenclatureWorking Principle of the Two-Stroke Marine Diesel Engine
In-Cylinder Heat Transfer in Two-Stroke Marine Diesel Engines
Thesis Focus and Motivation
Thesis Objective
Procedure
Structure of Thesis
Previously Obtained Results
Heat Transfer Modes in Engines
Convection
Thermal radiation
Conduction
General In-Cylinder Heat Flux Levels
Piston Surface Heat Transfer Investigations
Heat Transfer Studies in Large Two-Stroke Diesel Engines
Diesel Flame Impingement Heat Transfer Studies
Numerical In-Cylinder Heat Transfer StudiesJet Impingement Configuration
Geometry and Conditions
Jet temperature at inlet
Pressure
Wall temperature
Jet diameter at inlet and distance between inlet and wall
Jet velocity at inlet
Ambient gas temperature
Jet turbulence intensity at inlet
General remark on the reference conditions and geometry
Jet Impingement Process Versus Actual Process in Engine
Combustion reactions
Jet impingement normal to wall
Cross flow
Use of air as jet gas and ambient gas
Soot deposits
Jet shape
Jet velocityNumerical Modeling
Governing Equations
Turbulence modeling
Numerical Setup
Geometry and mesh
Boundary conditions
Turbulence model
Thermophysical properties and density
Discretization scheme, solution algorithm and convergence criteria
General comments on the numerical modeling
alidation Study
Numerical Setup for Validation Study
Geometry and mesh
Boundary conditions
Turbulence model
Thermophysical properties and density
Discretization scheme, solution algorithm and convergence criteria
Results
Flow and scalar fields
Velocity profiles
Nusselt number distributionsJet Impingement Heat Transfer Results
Reference Case
Flow and scalar fields
Heat flux distribution
Grid independency
Influence of domain size
Parameter Variations
Variation of ambient gas temperature
Variation of pressure
Variation of jet velocity at inlet
Variation of wall temperature
Variation of jet turbulence intensity at inlet
Modification of the Numerical Modeling
Influence of turbulence model
Presentation of Results in Dimensionless Form
Influence of Reynolds number
Influence of jet turbulence intensity at inlet
Influence of difference between jet and ambient gas inflow temperatures
Variation of wall temperature
Stagnation point heat transfer
Summary and Discussion of Results
Jet Impingement Heat Transfer Results
Estimation of Peak Heat Flux Level on Piston Surface
Evaluation of Estimated Peak Heat Flux Level on Piston Surface
Conclusions
Further Work
Numerical Work
Experimental WorkAppendix A: Dimensionless Parameters Influencing the Nusselt Number
Appendix B: Paper I