New breakthroughs in key technologies for wind tunnel testing in China

The Chinese Aerodynamics Research and Development Center retransmitted the low-speed report. The Institute of Aerodynamics' research and development of high-precision real-time spatial displacement measurement system based on linear array CCDs was successfully applied to a certain type of test, indicating that the system has a model test capability. The development of this system successfully solved the bottleneck problem in the low-speed wind tunnel test, improved the real-time measurement capability of the parameters such as model displacement, attitude angle, trajectory, and vibration, and provided powerful technical support for the balance calibration and related model low-speed test research. .

In the wind tunnel test, due to the inconsistency between the attitude of the model during wind load and the attitude at zero load, the data error, such as the uncertainty of a large airplane with a drag coefficient of 0.0001, will change the payload by 1% in the long-range cruise. The use of optical non-contact method for real-time displacement measurement to accurately obtain parameters such as attitude angle, trajectory, and vibration of the model is a key technique for improving the refinement degree of wind tunnel tests.

The institute developed a high-precision real-time spatial displacement measurement system based on a linear array CCD, which satisfies the measurement requirements for model displacement, attitude angle, trajectory, and vibration in low-speed wind tunnel tests, and establishes a real-time spatial displacement measurement test technique for low-speed wind tunnels. , meet the practical requirements of the type test project.

The system has the characteristics of good real-time performance, high accuracy, flexibility, and high cost performance. The technology ranks the leading domestic level. It is reported that this technology can also be applied to industrial on-line detection, motion analysis and other real-time high-precision displacement measurement field, with good economic benefits and broad application prospects. (Hu Xingyu Zhang Pengcheng reporter Tang Xianwu)

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