Abstract
Abstract
The temperature distribution and the difference with the
ambient temperature of the primary mirror are crucial factors
affecting the observational quality of the solar telescope. We
designed a flow field structure of the primary mirror temperature
control system based on the 2.5-meter Wide-field and High-resolution
Solar Telescope(WeHoT), analyzed the flow conditions and heat
transfer capacity of the overall flow field, and then carried out
five stages of optimization iteration and simulation guided by the
analysis results. A flow field structure for the primary mirror
temperature control system with high efficiency and high uniformity
is summarized. The simulation results for the final solution
indicate an average surface temperature of the primary mirror at
20.064°C, with a maximum temperature difference within the
reflective surface of 0.809°C, and a reduced difference
with the ambient temperature of 0.411°C. Surface thermal
deformation is less than 0.2 μm, with an RMS value of 18.05 nm,
achieving the ideal state. This work can provide a theoretical
foundation and valuable insights for future research on the
temperature control system of the primary mirror in large-aperture
solar telescopes.