一体化加力燃烧室隔热屏冷却特性研究OA

Based on the aerodynamic and thermodynamic conditions of the integrated afterburner,the influence of main structural parameters of the insulation screen air film cooling on the cooling performance is systematically studied through numerical simulation methods.This research results indicate that under the same inlet and outlet boundary conditions,an increase in the opening of the upstream injector increases the secondary flow rate,separating the heat shield from the main flow of gas.The increase in the aperture of the gas film increases the depth and momentum of the jet,and reduces the uniformity and continuity of the gas film coverage.The increase in the inclination angle of the gas film hole reduces the wall adhesion of the gas film.The increase in the axial spacing of the gas film holes enhances the superposition effect of the gas film,and increases the coverage range and uniformity of the gas film.The optimal structural parameters are as follows:The aperture of the hole d=1.2 mm,the tilt angle of the hole θ=30°,the axial spacing S=10 mm,and the corrugated plate height H=6 mm.This research uses a forked arrangement for the holes in the screen.