Infrared and Laser Engineering, Volume. 54, Issue 7, 20250026(2025)
Design and optimisation of thermal protection systems for infrared thermal imager in high temperature environments
Figures & Tables(23)
Fig. 1. Analysis of the external thermal environment of the thermal protection structure
Fig. 2. Schematic diagram of the overall thermal protection scheme of an infrared thermal imager
Fig. 7. Cloud plot of temperature variation with guide vane angle. (a)
Fig. 9. Variation of temperature with diffusion circle diameter cloud diagram. (a)
Fig. 11. Cloud plot of temperature variation with guide leaf length. (a)
Fig. 13. Variation of the average temperature of the thermal imaging camera with cooling air velocity/temperature
Fig. 14. (a) Schematic diagram of pasted thermocouple; (b) Fabrication diagram of diffuser; (c) Experimental site diagram
Fig. 15. Measured point temperatures at different room temperatures. (a) Room temperature 22.40 ℃; (b) Room temperature 27.13 ℃
Table 1. Thermal imaging camera specifications
View tableView in ArticleTable 1. Thermal imaging camera specifications
Parameter Value Response wavelength band 8-14 μm Focal length 4 mm Field of view (FOV) 90.3°(H)×68.7°(V) Temperature measurement range −20-+150 ℃ Suitable temperature 10-+50 ℃
Table 2. Simulation boundary conditions
View tableView in ArticleTable 2. Simulation boundary conditions
Category Prerequisite Air inlet Velocity inlet Air outlet Pressure outlet Constant temperature of outer wall surface 130 ℃ Inlet velocity 60 m/s Inlet air temperature 26.85 ℃
Table 3. Physical properties of materials involved in the simulation model
View tableView in ArticleTable 3. Physical properties of materials involved in the simulation model
Material $ {\rho } $ $ {{C}}_{{p}} $ $ {\lambda } $ Aluminum 2.7 897 237 Polytetrafluor-oethylene 2.2 1000 0.27 Stainless steel 7.93 500 25
Table 4. Diffuser analysis parameters
View tableView in ArticleTable 4. Diffuser analysis parameters
θ/（°） D1/mm L/mm 35 38 7 40 39 8 45 40 9 50 41 10 55 42 11 60 43 12
Table 5. Variation of convective heat transfer coefficient with diffusion circle diameter
View tableView in ArticleTable 5. Variation of convective heat transfer coefficient with diffusion circle diameter
D1/mm $ {h} $ / W·m−2·K−138 69.68 39 72.06 40 78.07 41 74.27 42 75.31 43 77.14
Table 6. Variation of convective heat transfer coefficient with guide vane length
View tableView in ArticleTable 6. Variation of convective heat transfer coefficient with guide vane length
L/mm $ {h} $ / W·m−2·K−17 67.40 8 60.28 9 73.16 10 78.07 11 62.47 12 72.05
Table 7. Calculated values for temperature gradient, thermal expansion and thermal stress
View tableView in ArticleTable 7. Calculated values for temperature gradient, thermal expansion and thermal stress
$ \dfrac{{{\mathrm{d}}}{T}}{{{\mathrm{d}}}{x}} $ $ \mathbf{\Delta }{L} $ $ {\sigma } $ 7366 0.11 5.52
Table 8. Experimental conditions
View tableView in ArticleTable 8. Experimental conditions
Category Prerequisite Temperature of the outer wall/℃ 79.28 Air inlet velocity/m·s−1 23.55,31.83,43.11,62.55
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Zhiyuan XI, Hailiang SHI, Jiasheng CAO, Xiongwei SUN, Xianhua WANG, Jile WANG. Design and optimisation of thermal protection systems for infrared thermal imager in high temperature environments[J]. Infrared and Laser Engineering, 2025, 54(7): 20250026
Paper Information
Category: Infrared
Received: Jan. 10, 2025
Accepted: --
Published Online: Aug. 29, 2025
The Author Email: Xiongwei SUN (xiongweisun@163.com)
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