Experiment on flow field of cavity in trapped vortex combustor

The flow field in the cavity of trapped vortex combustor (TVC) is important because the cavity can provide good flame stability via trapping vortex. Under various main flow rate conditions, particle image velocimetry (PIV) was used to experimentally study the flow field inside the cavity with four kinds of fuel and air supply structures, which were natural cavity without fuel injection orifices and cooling air slots, cavity with cooling air slots but no fuel injection orifices, cavity with cooling air slots and front or back wall fuel injection orifices. It shows that stable vortex is trapped in the cavity with various fuel and air supply structures under different main flow velocity in this experiment. Cooling air slots has little effects on the cavity flow field, but fuel injection orifices have a greater impact on the flow field and the center of vortex core in the injection section.