Aerodynamic modeling in dome seeing study of the 2.16-m telescope
| Autor: | Zhi-Gang Hou, Jian-Feng Tian, Jian-Feng Wang, Xiao-Jun Jiang, Hong-Bin Li, Tao-Ran Li |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Turbulence
Mechanical Engineering Acoustics Airflow Enclosure Astronomy and Astrophysics Aerodynamics 01 natural sciences Electronic Optical and Magnetic Materials law.invention 010309 optics Telescope Dome (geology) Space and Planetary Science Control and Systems Engineering Observatory law Contour line 0103 physical sciences 010303 astronomy & astrophysics Instrumentation Geology |
| Zdroj: | Journal of Astronomical Telescopes, Instruments, and Systems. 5:1 |
| ISSN: | 2329-4124 |
| Popis: | Aerodynamic analysis is a crucial part of evaluating dome seeing, which is one of the main factors affecting telescope image quality. Due to the large volume and high heat quantity inside the dome, dome seeing is a common issue. To characterize the thermodynamic performance of the 2.16-m telescope at the Xinglong Observatory, we describe computational fluid dynamic analyses for modeling the effects of passive ventilation as part of a preliminary study for a dome venting system. The aerodynamic modeling is built based on the structures of telescope and enclosure. In addition, the distribution of the temperature and the airflow around the enclosure are presented in several simulations with different slit orientations, including various wind–telescope relative azimuth angles. The airflow distribution was studied for two cases. The temperature and turbulent contour maps show that the current passive ventilation can cause turbulence and influence the accuracy of the image. The dome seeing is estimated using a postprocessing analysis based on the mechanical turbulence and temperature variations along the optical path. The results of dome seeing gave a suggestion of venting strategy. |
| Databáze: | OpenAIRE |
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