A constant volume spray bomb with initial conditions 50 bar, 800 K. 13.31 mg of n-Heptane is injected in 2.133 ms.
Physics and modelling
The basic flow code is a Favre-averaged compressible formulation of the Navier-Stokes equations. The turbulence model is selected from the
extensive library of LES models available in OpenFOAM; here, the anisotropic 1-equation model is used. Combustion is implemented using the Chalmers PaSR model.
The spray is represented by a finite number of ”droplet packets” with a distribution of temperature, droplet size, population and thermophysical properties. The
Lagrangian spray modelling includes the Reitz-Diwakar wave breakup model. The material properties of the fuel and air during combustion are modelled using
the thermophysical models for combusting mixtures available in OpenFOAM.
Animations
The first animation shows the magnitude of gaseous velocity as the spray is injected. The second animation shows the tracking of the spray parcels,
where the colour indicates the particle diameter.
Author
This work was performed by Dr. Niklas Nordin, Chalmers University. Animation of the spray simulation reproduced with kind permission of Niklas Nordin.
