Active radial clearance design method based on customized linear expansion coefficient

• Published in: Hangkong Gongcheng Jinzhan Vol. 16; no. 3; pp. 107 - 114
• Main Authors: ZHANG Shaoping, PANG Yanlong, CHEN Yanyan
• Format: Journal Article
• Language: Chinese
• Published: Editorial Department of Advances in Aeronautical Science and Engineering 01.06.2025
• Subjects: casing material selection; clearance design; compressor; linear expansion coefficient; multiple loading conditions
• ISSN: 1674-8190
• DOI: 10.16615/j.cnki.1674-8190.2025.03.11

The active clearance control (ACC) technology for compressors in aero engines has slow deformation response, which is not suitable for military aero engines with drastic changes in throttle lever, and leads to the problem of excessive radial tip clearance in the compressors of military aviation engines during cruising. The thought and specific implementation method for the active radial clearance design of aircraft compressor clearance is studied. By utilizing the characteristic that the radial deformation of the compressor casing is mainly determined by thermal loads, the adjustable and positive design of the casing′s radial deformation is achieved by customizing the linear expansion coefficient of the casing. The design method is applied to the clearance design of the third-stage rotor of a certain compressor. The results show that the active radial clearance design method can achieve the design goal of reducing the clearance of the engine in several stable operating conditions such as cruising. Moreover, i