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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:
  predictor-corrector 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 two-way 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 node-centred and cell-centred support points on the primary grid
• Vaporisation model:
  • Abramzon-Sirignano 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 Gosman-Ioannides model
• Visualisation/tabulation of spray results

Particle trajectories in a model combustion chamber