关键词: 航空发动机, 喷嘴, 螺旋槽, 非接触式测量

Abstract: In order to achieve the goal of rapid and accurate inspection of the swirl slots of fuel nozzles in aero engine, measuring and calculating methods of the depth, width and swirl angle of the swirl slot are proposed which guide the design and establishment of a non-contact precision measuring system for swirl slots. In the measuring system, the horizontal boring structure with mobile column is adopted and its motion mechanism is composed of three linear axes denoted as X, Yand Z, as well as a rotatory axis denoted as A. As for the electrical control module, it is realized by the master-slave control mode of two levels, which is based on the combination of industrial computer and special programmable multi-axis controller. Also, a new optical conoscopic holography sensor is used as the front detector and a calibrationfree fixture of high precision is applied to realize the installation and location of the measured nozzles. Finally, a fuel nozzle is selected as the target and its swirl slot features are measured several times on the system, in which the depth, width and swirl angle are all derived through calculation. As the experimental results show, the repeatability accuracy of the system could meet the inspecting requirements of this kind of fuel nozzles.

Key words: Aero engine, Nozzles, Swirl slot, Non-contact measurement