Flow Behavior in the Dump Diffuser Combustor With a Split Flow Effects of Inclined Wall in a Sudden Expansion Region

Recent aero-engine combustors have been of a large flame dome. The combustor diffuser wit h deep flame dome results in the large total pressure loss. It is important to obtain both better aerodynamics performance of the total pressure and exhaust gas characteristics of NOx in the combustor. Installation of an inclined wall within the dump diffuser combustor with a split flow at the flame dome head is suggested in order to improve the aerodynamic performance. The cold flow experiment in a model channel of the combustor diffuser conducted by the Laser Doppler Velocimetry system shows that the inclined wall is effective in improvement of the diffuser performance regardless of the ratio of the split flow rate. The key technology factor of inclined wall installation is the selection of the throat area ratio between the inclined wall and the flame dome.