Transactions of Nanjing University of Aeronautics & Astronautics
Thermal Control Design for Enhancing Tolerance of Large-Aperture Reflective Camera “Sun Transit” on Geostationary Earth Orbit
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Abstract:
The large-aperture reflective cameras on the geostationary orbit are susceptible to significant temperature fluctuations due to the “Sun transit” effect. To address the shortcomings of existing thermal control measures using camera sunshades to suppress the “Sun transit” and the issue of excessively large solar avoidance angles determined solely by geometric relationships， a thermal control design method is proposed that involves adding multi-layer thermal protection at the secondary mirror position of the camera. The goal is to optimize the avoidance angle and enhance the camera’s tolerance to “Sun transit”. A heat balance and motion relationship between the avoidance angle and duration is established. Then， the minimum solar avoidance angle after adopting the multi-layer thermal protection design is calculated. This angle is compared with the one determined by geometric relationships， leading to the conclusion that this method can effectively enhance the camera’s tolerance to “Sun transit”. A heat dissipation scheme is proposed that involves a coupled north-south heat spreader design with low-temperature compensation for the internal heat source. The calculation results of the two avoidance angles are applied to the calculation of the heat dissipation area and low-temperature compensation power， achieving a closed-loop heat dissipation scheme. Puls， the superiority of the multi-layer thermal protection design method is demonstrated from the perspectives of heat dissipation area and low-temperature compensation power requirements. A comparative analysis of simulation analysis， thermal balance tests， and in-orbit temperature data further validates the effectiveness of this method.
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Project Supported:
The work was supported by the National Key Research and Development Program of China（No.2021YFC2202102）.
Clc Number:
V444.3
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