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Flow field design and experimental investigation of electrochemical trepanning of diffuser with a special structure

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Abstract

The diffuser is a key part of the aircraft engine, and electrochemical machining (ECM) is one of the main methods to process it. In the ECM of a diffuser, the suitability of the flow field determines whether the ECM can be successful. A suitable flow field can not only improve the stability of the machining, but also influence its machining efficiency and surface quality. A diffuser with a special structure is processed by the method of electrochemical trepanning in this paper. A back pressure is added to the machining zone, which is different from the outlet-open flow mode always used in traditional machining method, and the outlet-cornered gap is optimized. Simulation results show that the uniformity of the flow field is optimal when the outlet-cornered gap ζ is 0.35 mm. Furthermore, the experimental investigations are carried out, and the results show that when the feed rate of the cathode is increased from 0.5 to 0.7 mm/min, the blade accuracy is enhanced.

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Funding

This work was supported by the National Natural Science Foundation of China (91860135), the Natural Science Foundation of Jiangsu Province (BK20171413), and the Fundamental Research Funds for the Central Universities (NE 2017003).

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Authors and Affiliations

  1. National Key Laboratory of Science and Technology on Helicopter Transmission, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China

    Juewu Xu, Dong Zhu, Jiahao Lin & Xingyan Hu

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  1. Juewu Xu
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  2. Dong Zhu
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  3. Jiahao Lin
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  4. Xingyan Hu
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Correspondence to Dong Zhu.

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Xu, J., Zhu, D., Lin, J. et al. Flow field design and experimental investigation of electrochemical trepanning of diffuser with a special structure. Int J Adv Manuf Technol 107, 1551–1558 (2020). https://doi.org/10.1007/s00170-020-05091-6

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  • DOI: https://doi.org/10.1007/s00170-020-05091-6

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