整体叶盘叶栅通道电解加工流场仿真研究

Investigation on Flow Field of Cascade Passage in Electrochemical Machining of Blades

电解加工是航空发动机整体叶盘制造的主要技术之一,加工间隙内电解液流动的均匀性是影响加工稳定性和表面粗糙度的核心因素。针对叶栅通道电解加工,对比分析电解液侧流式下的正向流动与反向流动加工间隙内流场状态,通过数值仿真对比分析可知,正流方式下加工间隙内电解液流速较高,流场均匀性较好,故正流方式有利于叶栅通道电解加工。开展了电解液正流电解加工试验,结果表明,采用正流方式进行叶栅通道电解加工,轮毂粗糙度可达0.316μm,叶盆、叶背余量重复误差分别为0.096 mm,0.103 mm,为下一步叶片型面精加工提供了良好的条件。

Electrochemical machining is one of methods which is used to prepare blad. The electrolyte flow in the machining gap plays a important role in ECM,it affects the ECM stability and accuracy and the surface quality. In this paper,the uniformity of the electrolyte in the positive and negative fluid flow is analyzed. The simulation results indicates that the uniformity of its positive flow way is better than its negative flow way,and the velocity of the electrolyte under the positive flow way is 23. 7 m / s,under the negative flow way is 21. 3m / s. Furthermore,the verification experiment is carried out and the results show that the surface roughness of the hub is 0. 316 μm,the repetitive error of the convex part and the concave part is 0. 096 mm and 0. 103 mm,respectively.