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Proceedings Paper

Telescope enclosure flow visualization
Author(s): Fred F. Forbes; Woon-Yin Wong; Jack Baldwin; Walter A. Siegmund; Siriluk Limmongkol; Charles H. Comfort
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Paper Abstract

Dome-induced thermal disturbances that degrade seeing can originate when temperature differences exist between the interior and exterior of a telescope enclosure. It is important to design enclosures which minimize the effect. One design aid is to model the enclosure and study the flow patterns in and around the model at various angles to the flow direction. We have used a water tunnel and models of spherical, octagonal, and rectangular enclosures to investigate the flow characteristics as a function of angle and venting configuration. In addition to a large video data-base, numerical results yield flushing times for all models and all venting arrangements. We have also investigated the comparative merits of passive venting as opposed to active forced flow circulation for the 4m telescope enclosure at the NOAO Cerro Tololo Interamerican Observatory at La Serena, Chile. Finally, the flow characteristics of a tracking half-shroud were studied as a possible shield for the enclosureless case.

Paper Details

Date Published: 1 December 1991
PDF: 15 pages
Proc. SPIE 1532, Analysis of Optical Structures, (1 December 1991); doi: 10.1117/12.48262
Show Author Affiliations
Fred F. Forbes, National Optical Astronomy Observatories (United States)
Woon-Yin Wong, National Optical Astronomy Observatories (United States)
Jack Baldwin, Cerro Tololo Inter-American Observatory (United States)
Walter A. Siegmund, Univ. of Washington (United States)
Siriluk Limmongkol, Univ. of Washington (United States)
Charles H. Comfort, Univ. of Washington (United States)

Published in SPIE Proceedings Vol. 1532:
Analysis of Optical Structures
Donald C. O'Shea, Editor(s)

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