Flame stabilizing device and method for supporting plate with cavities

The invention provides a flame stabilizing device and method of an afterburner for a gas turbine engine. In the device, the original turbine rear frame supporting plate is replaced with the supporting plate with the cavities; and the device is characterized in that: the section of the supporting plate is in the shape of a wing with a suddenly expanded trailing edge and is provided with the cavities. The aim of stabilizing flame is fulfilled through a low-speed backflow region formed by flowing gas flow through the cavities of the supporting plate and the suddenly expanded part of the trailing edge. The invention provides the turbine rear frame supporting plate (2) of the afterburner for the gas turbine engine; the afterburner comprises a case (12), a turbine rear frame inner wall (1) and a plurality of turbine rear frame supporting plates (2), wherein the turbine rear frame supporting plates (2) are connected with the case (12) and the turbine rear frame inner wall (1); and the turbine rear frame supporting plate (2) is characterized by being provided with the cavities (9).