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提出基于软性磨粒流的复杂曲面与约束模块相配合的高精密抛光加工方法。使磨料高速高压通过经过设计的流道,利用液固两相软性磨粒流中磨粒的微量切削力加工复杂曲面,从而克服复杂曲面直接接触抛光的困难。以计算流体力学(CFD)的理论作为进行流体仿真的理论基础。建立了复杂曲面与约束模块组成的流道三维模型。通过前处理软件ICEM CFD画出三维模型的网格。将网格文件导入流体分析软件FLUENT。在FLUENT中采取Mixtrue两相流和k-ε湍流模型对涡轮整体叶盘的磨粒流抛光进行流场的三维数值模拟,获得流场中磨料的流动模式。主要对不同压力差下流场的压力场和湍流动能进行分析,得到出入口压强差对磨料的流动细节和特性的影响,从而达到对流场进行分析的目的。
A high-precision polishing method based on soft abrasive flow with complex curved surfaces and constrained modules is proposed. Make the abrasive high speed and high pressure pass through the designed runner and utilize the micro cutting force of the abrasive grains in the liquid-solid two-phase soft abrasive flow to process the complex curved surface so as to overcome the difficulty of the direct contact polishing of the complex curved surface. The theory of computational fluid dynamics (CFD) is used as a theoretical basis for fluid simulation. A three-dimensional model of runner with complex surface and constraint module is established. Draw the mesh of the 3D model through preprocessing software ICEM CFD. Import the mesh file into the fluid analysis software FLUENT. In FLUENT, the two-phase Mixtrue and k-ε turbulence models were used to simulate the three-dimensional flow field of the turbo-integrated leaf disc, and the flow pattern of the abrasive in the flow field was obtained. The pressure field and turbulent kinetic energy of the flow field under different pressure differences are mainly analyzed to obtain the influence of the pressure difference between inlet and outlet on the flow details and characteristics of the abrasive so as to achieve the purpose of analyzing the flow field.