| Citation: | WEI Naying, WU Linghao, ZHONG Ming, et al. Flexible endoscopic PIV and its application in velocity field measurement of confined spaces[J]. Journal of Aerospace Power, 2026, 41（X）：20250482 doi: 10.13224/j.cnki.jasp.20250482
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Facing the challenge of endoscopic particle image velocimetry (PIV) measurements within the confined spaces of aero-engine compressors and fans, a flexible endoscopic PIV method was proposed. This approach employed a flexible fiber-optic image bundle as the core image transmission component, and integrated with a self-developed endoscopic lens. It effectively overcame the limitations of traditional rigid endoscopes in vibration-prone environments, such as restricted field of view, susceptibility to motion blur, and insufficient installation reliability. Based on the test constraints of the internal flow field in a certain type of aero-engine compressor, a self-developed endoscopic imaging lens suitable for confined space detection was designed. This lens was integrated with a fiber-optic image bundle and an interframe camera to construct an endoscopic flow field acquisition system. Calibration experiments were conducted to quantify the optical loss and optical non-uniformity introduced by the fiber bundle. A pixel-by-pixel compensation method was proposed to significantly enhance the image quality of the flexible endoscopic system. Experimental validation demonstrated that this flexible endoscopic PIV system successfully captured the intended turbulent jet velocity distribution. Compared with traditional PIV measurements, the results presented an average relative error controlled within 3%, effectively verifying the system's accuracy. This method could provide a technical approach for refined measurements of complex flow fields within aero-engines.
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