Modern aviation industry solves the problem of developing multifunction engines capable of flying both at subsonic and supersonic speeds. An important part in such engines is a variable area nozzle, which allows varying the geometry of the engine exhaust unit and, accordingly, its technical characteristics. This study touches upon an computer vision based optical noncontact method for reconstructing a nozzle shape. The reconstruction requires data recorded by two optical three-dimensional recorders directed toward the inner part of the nozzle when the engine is subjected to ground tests. The diagnosis is complicated by the presence of a hot jet being in the way of the sensor vision, the regime-dependent variation of the nozzle glow brightness, and intense mechanical vibrations. The performed bench tests confirm the efficiency of the proposed method. According to their results, in a low-gas regime, the standard deviation of the diagnosed diameters of the exhaust unit and critical sections for each frame does not exceed 0.3% of the corresponding sizes. The data obtained as a result of this diagnosis can be taken into account when upgrading the exhaust unit of the engine and the thrust control system of a gas turbine engine.

现代航空工业解决了开发能够同时以亚音速和超音速飞行的多功能发动机的问题。在这种发动机中的重要部分是可变面积喷嘴，该喷嘴允许改变发动机排气单元的几何形状以及相应的技术特征。这项研究涉及一种基于计算机视觉的光学非接触式方法，用于重建喷嘴形状。重建需要在发动机进行地面测试时由两个指向喷嘴内部的光学3维光学记录器记录数据。由于传感器视觉中存在热射流，喷嘴辉光亮度的依状态而定的变化以及强烈的机械振动，因此诊断变得复杂。进行的基准测试证实了所提出方法的效率。根据他们的结果，在低气体状态下，每个框架的排气单元和关键部分的诊断直径的标准偏差不超过相应尺寸的0.3％。当升级发动机的排气装置和燃气轮机发动机的推力控制系统时，可以考虑由于该诊断而获得的数据。