Rapid Calibration Method of Throat Area of Geometry-Variable Circular Nozzle Based on Laser Interference
FAN Jinxia1, 2, FU Xiao1, YAN Rong1, 2, LI Jie2, LIANG Chunjiang3, DUAN Fajie1
1. The State Key Lab of Precision Measuring Technology and Instruments, Tianjin 300072, China;
2. AECC Sichuan Gas Turbine Research Establishment, Mianyang 611730, China;
3. Smartmens (Tianjin) Technology Co., Ltd., Tianjin 300382, China
The throat area of the geometry-variable nozzle directly affects the performance of the aero-engine. The inner diameter micrometer is traditionally used to measure the throat size, which has some problems, such as low efficiency and droop of the nozzle seal affecting the measurement accuracy. Therefore, we put forward a calibration method for throat area of tunable circular nozzle based on laser interference. Firstly, a coaxial length measurement structure is designed which features built-in laser interference optical path. A pressure sensor is utilized to give real-time feedback to automatically control the thrust. Then the polygon throat area of the nozzle is calculated from the dimensional measurement data. Finally, the correlation model between throat area and engine control signal is established based on the least square method. The experimental result shows that the size measurement accuracy of the developed system is 41 μm, the area calibration accuracy is 0.98147, and the method features good simplicity and convenience.
樊金侠,傅骁,颜荣,李杰,梁春疆,段发阶. 基于激光干涉的可调圆形尾喷管喉部面积标定方法研究[J]. 航空制造技术, 2023, 66(7): 43-49.
FAN Jinxia, FU Xia, YAN Rong, LI Jie, LIANG Chunjiang, DUAN Fajie. Rapid Calibration Method of Throat Area of Geometry-Variable Circular Nozzle Based on Laser Interference[J]. Aeronautical Manufacturing Technology, 2023, 66(7): 43-49.