
Research Field
SPRAYSIM Code
SPRAYSIM is a CFD code developed by the Institute of Combustion Technology in order to simulate spray formation and spray propagation in gas turbine combustion chamber flows. To do this, it is necessary to model primary and secondary atomization, vaporisation and turbulent particle dispersion, and to calculate the spray effects on the gas field. SPRAYSIM is a platform for developing and validating such models and numerical algorithms, and is under continuous development.
The main features of the code are:
 FORTRAN 95 code, runs on various UNIX/LINUX/WINDOWS platforms
 Spray and atomization simulation using Lagrangian particle tracking on unstructured grids
 Solving ordinary differential equations:
predictorcorrector with automatic step control
 Spray boundary conditions for:
walls, inlets/outlets, planes of symmetry,periodic boundaries
 Generating initial particle conditions:
 generically by applying correlations or measurements
 or using atomization models
 Atomization models:
 TAB, ETAB, CAB
 Stripping model (Rachner (DLR))
 SPRAYSIM can be used on its own or in twoway coupling with CFD codes (so far with THETA, CFX, FLUENT, TASCOM)
 Interpolation of gas field variables at the particle location, as well as redistribution of the spray reaction source terms from/to nodecentred and cellcentred support points on the primary grid
 Vaporisation model:
 AbramzonSirignano type
 Continuous thermodynamics model for continuous approximation of the composition (gamma PDF and Fourier series PDF) of multicomponent fuels
 Liquid phase:
may consist of any number of discrete species and/or continuous PDFs
 Resolution of droplet internal processes:
 Rapid mixing model (0d)
 Conduction limit / effective conductivity model (1d)
 The equivalent species concept allows a reduced number of transport equations for fuel vapour species in the gas field CFD code compared to the number of species in the spray computation
 Dispersion models:
 Spectral dispersion model developed by Blümcke (DLR)
 Variants of the GosmanIoannides model
 Visualisation/tabulation of spray results
Particle trajectories in a model combustion chamber 




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