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Numerical study on correction methods for infrared characteristics measurement of high-speed aircraft under wind tunnel background radiation interference
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Xiaojuan SHI1, *, Lele ZHANG1, Honghu JI1, Feng XIE2, Wanqing LUO3
Journal of Experiments in Fluid Mechanics | 2026, 40(2) : 13 - 23
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Journal of Experiments in Fluid Mechanics | 2026, 40(2): 13-23
• Special Topic on Research and Application Progress of Jet Flow in High-Speed Vehicles •
Numerical study on correction methods for infrared characteristics measurement of high-speed aircraft under wind tunnel background radiation interference
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Xiaojuan SHI1, *, Lele ZHANG1, Honghu JI1, Feng XIE2, Wanqing LUO3
Affiliations
  • 1Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • 2Hypervelocity Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang 621000, China
  • 3National Key Laboratory of Aerospace Physics in Fluids, Mianyang 621000, China
Published: 2026-04-25 doi: 10.11729/syltlx20250020
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Wind tunnel testing serves as a critical method for studying the performance of high-speed aircraft. Enhancing the measurement accuracy of infrared characteristics in wind tunnel tests can provide more reliable data support for predicting aircraft infrared signatures and designing stealth performance, embodying significant engineering value. However, in wind tunnel tests, the interference of background radiation inside the wind tunnel makes it difficult to accurately obtain the true infrared radiation (IR) of the aircraft, directly affecting the execution of wind tunnel tests and the use of test data. The CFD (computational fluid dynamics) method verified by simulation accuracy was used to simulate the state of a conventional hypersonic blowdown wind tunnel with the incoming Mach number at the test section inlet in the range of 3–10. A numerical study was conducted on correction methods for IR measurement in the 3–5 μm band at a lateral 90${\text{°}} $ direction for the aircraft and lateral jet, aiming at the interference of wind tunnel background radiation. A progressive measurement procedure based on background field separation was proposed. Through a stepwise experimental design involving cold-model interference calibration and hot-target measurements, the interference signals were stripped. The relationships between the intrinsic radiation of the aircraft surface and lateral jet and the total IR received by the detector were established respectively. The interference factors in IR measurement were identified. The correction formulas for measuring the intrinsic IR of the aircraft surface and lateral jet were derived. The results show that the influence of interference factors on the IR of lateral jet is relatively small, ranging between 1.6% and 2.8%. When the incoming flow Mach number in the wind tunnel test section is between 3 and 5, the influence of interference factors on the IR of the aircraft surface exceeds 10%. Especially at a Mach number of 3, the proportion of interference signals reaches 70.72%.

wind tunnel  /  high-speed aircraft  /  lateral jet  /  infrared radiation  /  interference factor  /  correction method
施小娟, 张乐乐, 吉洪湖, 谢峰, 罗万清. 风洞背景辐射干扰下高速飞行器红外特征测量修正方法的数值研究. 实验流体力学, 2026 , 40 (2) : 13 -23 . DOI: 10.11729/syltlx20250020
Xiaojuan SHI, Lele ZHANG, Honghu JI, Feng XIE, Wanqing LUO. Numerical study on correction methods for infrared characteristics measurement of high-speed aircraft under wind tunnel background radiation interference[J]. Journal of Experiments in Fluid Mechanics, 2026 , 40 (2) : 13 -23 . DOI: 10.11729/syltlx20250020
Appendix
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Year 2026 volume 40 Issue 2
96
38
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Article Info
doi: 10.11729/syltlx20250020
  • Receive Date：2025-02-27
  • Online Date：2026-10-22
  • Published：2026-04-25
Article Data
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History
  • Received：2025-02-27
  • Revised：2025-07-01
  • Accepted：2025-07-03
Affiliations
    1Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
    2Hypervelocity Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang 621000, China
    3National Key Laboratory of Aerospace Physics in Fluids, Mianyang 621000, China
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表12种不同金属材料的力学参数
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多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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