Modeling of special features of flow in a planar vortex chamber

The numerical calculations of the flowfield in a planar vortex chamber have been performed. The model is based on conservation laws of mass, momentum and energy for nonsteady two-dimensional compressible gas flow in case of swirl axial symmetry. The processes of viscosity, heat conductivity and turbulence have been taken into account. It was found that transition of kinetic energy of gas into heat due to processes of dissipation generates “hot spots” in boundary layers at the chamber walls. The gas temperature at the spots may exceed the temperature of gas ignition, while the surrounding regions remain still cold. It may be the reason of cold gas self-ignition observed in experiments.