For the optimization design of aero-engine turbine joint structure

a 3-step optimization method was developed based on different levels and requirements:basic parameter optimization for 2-D model of joint

joint structure optimization for 3-D model with disk and multidisciplinary optimization of aerodynamics and structural strength for disk. The 3-step optimization process was iterative; in the first step

the basic parameters were built; the secondary step was established on former results

while some important parameters influencing the disk can be taken into account. When the second step cannot meet the requirements or make the best result

the multidisciplinary optimization was conducted

the outlines of turbine flow path were designed according to aerodynamics analysis

and the 3-D turbine blades were introduced. Through the multidisciplinary optimization of aerodynamic and structural strength

the optimum solution can be obtained to realize the relatively best result of the two disciplines. The results show that

after the optimization the max radial stress of the joint structure dropped by 12.7% in the first step

the mass of turbine decreased by 6.9% in the second step and the comprehensive result of aerodynamic and structural strength increased by 2.4% in the third step while meeting the requirements of design.