Acta Photonica Sinica, Volume. 51, Issue 4, 0412001(2022)
Thermal Analysis and Verification Test of the Entrance Window Assembly for Space Solar Observatory
Figures & Tables(22)
Fig. 14. Temperature distribution of M1 without/with 3M tape pasted
Table 1. The equivalent solar radiation parameters of each coating
View tableView in ArticleTable 1. The equivalent solar radiation parameters of each coating
Coating Solar transmittance Solar absorptivity Solar reflectance UV shield 0.023 0.55 0.427 Narrow-band filter 0.023 0.55 0.427 IR blocker 0.028 5 0.287 0.684 5
Table 2. Parameters of each analysis case
View tableView in ArticleTable 2. Parameters of each analysis case
Item Case 1 Case 2 Case 3 Cold case Hot case Calibration case Simulation date Summer solstice Winter solstice Winter solstice Solar irradiance 1 300 W/m2 1 450 W/m2 1 450 W/m2 Satellite attitude Sun oriented Sun oriented Deviating maneuver Simulation orbit periods 20 20 20 Initial temperature 18℃ 18℃ 18℃ Surface radiation characteristics BOL EOL EOL Outer surface of the mounting board -50℃ -10℃ -10℃ Outer surface of the satellite heat-shield -90℃ -60℃ -60℃ Radiation interface of other payloads -60℃ -10℃ -10℃ Optic box 20℃ 24℃ 24℃
Table 3. Thermo-physical parameters of materials and radiation characteristics of coatings
View tableView in ArticleTable 3. Thermo-physical parameters of materials and radiation characteristics of coatings
Materials αs εh ρ/
（kg·m-3）
C/
（J·kg-1·K-1）
λ/
（W·m-1·K-1）
F46 0.13（BOL）
0.30（EOL）
0.73 / / / S781 0.20（BOL）
0.40（EOL）
0.86 / / / LY12 0.88 0.88 2 710 946 117.2 TC4 0.88 0.88 4 450 678 5.44 Fused SILICA / / 2 205 766 1.31 Glass fiber reinforced plastic / / 1 400 1 110 0.342
Table 4. Absorbed heat flux of different components of HEWA in the three analysis cases
View tableView in ArticleTable 4. Absorbed heat flux of different components of HEWA in the three analysis cases
Case Baffle UV shield Narrow-band filter IR blocker 1 IR blocker 2 Primary mirror Theoretical calculation（only primary
reflection and transmission are considered）
/ 0.607 W 0.334 W 0.218 W 0.066 W 0.041 5 W Case 1（100% mirror reflection） 4.64 W 0.812 W 0.572 W 0.470 W 0.199 W 0.101 W Case 1（80% mirror reflection） 6.39 W 0.763 W 0.534 W 0.427 W 0.159 W 0.073 5 W Case 2（100% mirror reflection） 8.51 W 1.01 W 0.754 W 0.616 W 0.258 W 0.134 W Solar 4.81 W 0.95 W 0.75 W 0.616 W 0.258 W 0.134 W Albedo 0.53 W 0.000 4 W 0.000 26 W 0.000 18 W 0.000 067 5 W 0.000 023 9W Planet 3.16 W 0.0527 W 0 0 0 0 Case 2（80% mirror reflection） 10.89 W 0.939 W 0.709 W 0.562 W 0.209 W 0.113 W Case 3（100% mirror reflection） 22.2 W 0.33 W 0.165 W 0.108 W 0.029 9 W 0.010 W Case 3（80% mirror reflection） 21.85 W 0.329 W 0.164 W 0.111 W 0.032 8 W 0.001 W
Table 5. Thermal analysis results of the HEWA
View tableView in ArticleTable 5. Thermal analysis results of the HEWA
Components Index /℃ Case 1 Case 2 Case 3 100% mirror reflection /℃ 80% mirror reflection /℃ 100% mirror reflection /℃ 80% mirror
reflection /℃
100% mirror
reflection /℃
80% mirror
reflection /℃
Baffle / -9.0~-1.2 -7.2~-0.5 -4.2~2.0 -3.0~2.8 11.5~26.5 11.0~26.0 Window frame 0~50 4.5~5.5 4.7~5.8 4.7~5.8 5.1~6.0 14.7~27.0 14.0~26.0 M1 0~50 4.5~7.2 4.6~7.2 6.4~8.2 6.0~7.8 15.0~24.0 14.6~23.4 M2 0~50 7.0~9.3 7.0~9.4 8.0~9.9 7.6~9.7 17.0~24.4 17.6~24.0 Primary mirror 22±2 21.1~22.2 21.1~22.1 21.3~22.2 21.4~22.2 21.8~22.4 21.6~22.2
Table 6. Thermal balance test results of the HEWA
View tableView in ArticleTable 6. Thermal balance test results of the HEWA
Components Index /℃ Case 1 Case 2 Case 3 Test results/℃ Analysis
results /℃
Test results/℃ Analysis
results /℃
Test results/℃ Analysis
results /℃
Baffle / -20.3~-19.0 -9.0~-1.2 -12.7~-10.5 -4.2~2.0 7.2~23.3 11.5~26.5 Window frame 0~50 0.1~5.1 4.5~5.5 0.9~5.3 4.7~5.8 14.7~26.5 14.7~27.0 M1 0~50 7.2~8.4 4.5~7.2 10.4~11.7 6.4~8.2 14.9~32.8 15.0~24.0 M2 0~50 8.3~10.5 7.0~9.3 9.2~11.1 8.0~9.9 18.7~22.8 17.0~24.4 Primary mirror 22±2 21.7~21.8 21.1~22.2 21.7~21.9 21.3~22.2 21.8~22.3 21.8~22.4
Table 7. Comparison of the modified analysis results and the test results
View tableView in ArticleTable 7. Comparison of the modified analysis results and the test results
Components Index /℃ Case 1 Case 2 Case 3 Modified
analysis
results/℃
Test
results/℃
Modified
analysis
results/℃
Test
results/℃
Modified analysis
results/℃
Test
results/℃
Baffle / -22.0~-15.0 -20.3~-19.0 -15.5~-8.2 -12.7~-10.5 5.4~24.1 7.2~23.3 Window frame 0~50 -0.2~5.2 0.1~5.1 0.6~5.2 0.9~5.3 11.5~26.8 14.7~26.5 M1 0~50 7.0~8.6 7.2~8.4 8.5~11.3 10.4~11.7 14.8~32.6 14.9~32.8 M2 0~50 8.5~10.5 8.3~10.5 10.0~11.5 9.2~11.1 18.0~23.3 18.7~22.8 Primary mirror 22±2 21.7~22.3 21.7~21.8 22.0~23.0 21.7~21.9 21.8~23.5 21.8~22.3
Table 8. Prediction of the temperature distribution of the HEWA on orbit
View tableView in ArticleTable 8. Prediction of the temperature distribution of the HEWA on orbit
Components Index/℃ Case 1/℃ Case 2/℃ Case 3/℃ Baffle / -18.0~-10.0 -8.5~-1.0 7.1~26.2 Window frame 0~50 4.4~5.3 4.5~5.5 12.7~28.2 M1 0~50 6.2~7.4 7.5~8.8 16.5~26.3 M2 0~50 8.5~10.5 10.0~11.5 18.5~23.5 Primary mirror 22±2 21.7~22.3 22.0~23.0 21.5~23.0
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Chenjie WANG, Wenquan TAO, Wengang YANG, Yixin MA, Dejin QIN, Fu LI. Thermal Analysis and Verification Test of the Entrance Window Assembly for Space Solar Observatory[J]. Acta Photonica Sinica, 2022, 51(4): 0412001
Paper Information
Category: Instrumentation, Measurement and Metrology
Received: Nov. 4, 2021
Accepted: Jan. 5, 2022
Published Online: May. 18, 2022
The Author Email: TAO Wenquan (wqtao@mail.xjtu.edu.cn)
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