The invention discloses an engine
turbine disc cavity structure with a pre-rotation
nozzle and a flow guiding disc. The engine
turbine disc cavity structure comprises a
turbine disc and further comprises the flow guiding disc and a pre-rotation
nozzle ring which are arranged in front of the turbine disc. High-pressure low-temperature two-strand
airflow is divided into two strands after entering apre-rotation
airflow cavity through the pre-rotation
nozzle ring. One strand of
airflow passes through pre-rotation cool air receiving holes evenly distributed in the circumferential direction of theflow guiding disc and enters an axial ventilation hole in the bottom of a turbine disc mortise along a radial flow guiding plate on the rear side of the flow guiding disc. The other strand of airflowpasses through a sealed grid tooth ring on the flow guiding disc, and after the other strand of airflow is pre-rotated and pressurized through an inclined flow guiding plate above the front side of the flow guiding disc and is converged with cool air from cool air
impact holes evenly distributed in the circumferential direction of the installing edge of a guiding device, the other strand of airflow enters a main runner through a
turbine rotor and
stator gap. By means of the engine turbine disc cavity structure, the relative total temperature of cool air can be reduced,
convection heat exchangeof cool air and the turbine disc is enhanced, pre-rotation pressurizing is conducted on the wheel edge seal gas, the seal effect is improved, and seal gas and main flow mixing losses are reduced.