Topology And Shape Optimization Method For Turbine Disk

Turbine disk is the key component in aero-engine. The advantage of structure design directly affects the performance of the turbine rotor and the integrity of the engine. High-performance aero-engine requires high quality turbine disk, and modern structural optimization approach will be engaged. First, with considering a variety of design criteria, a reasonable topological layout of turbine disk can be achieved by using the structural topology optimization method; Then, based on the known topological layout, a more specific and precise shape, size and processing optimization for turbine disk can be carried out.The thesis focuses on the topology and shape optimization of turbine disk and the following aspects:1. Based on inheriting the idea of classical BESO method, the concept of random sampling sensitivity analysis (RSSA) is developed, and the arithmetic structure is redesigned, a new RSSA-BESO method is proposed, which overcomes the prone oscillation problems of the classical BESO method.2. Base on the RSSA-BESO method, the turbine disk topological optimization design is carried out, and a new twin-web turbine disk design is obtained. The result shows that the weight of turbine disk is reduced 12.76%, comparing with the single-web turbine disk under the same design conditions.3. The B-spline approximation method for ladder-like border of the topology is studied, and the third-order non-uniform rational B-spline is employed in the boundary curve approximation of turbine disk ladder-like border, which has the significant effect on improving the smoothness of the border.4. By selecting the B-spline approximation curve control points as the optimization variables, and using the integrated zero-order optimization method in ANSYS, the topology boundary shape of turbine disk is optimized. The optimized twin-web turbine disk is 20.5% lighter than the single-web one under the same design conditions with following the relatively smooth boundary.