1 Overview 2 Details of the Model Construction - Canada France ...

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Figure 8: Closeup view of the small vent dome showing the telescope model. The aluminum block right of center of the telescope represents the freight elevator, while the aluminum segment representing the mezzanine is in the foreground. in the water, determine optimal lighting and camera positions, dye injection using a hand syringe, and check for other other unforeseen logistical issues. A “dry” run with the video cameras was performed at night in the HQ parking lot to simulate realistic lighting conditions to be encountered at the UWAL facility. The tempered glass used in the tank was 3/8” thick; the tank had windows on both sides as well as at the bottom, similar to the UWAL water tunnel. Figure 9: The plywood and glass testing tank used to test model visibility and other logistic issues in Waimea. Slightly leaky, but serviceable!
4 Dye Probe Locations Dye probe ports were installed on the telescope floor, inside the, in the Cassegrain baffle and at several locations on the terrain. The probe ports consisted of 9/32” (7.1 mm) brass tubing fitted with Delrin caps and packed with dense open-cell foam (art foam) to provide friction. The Delrin caps were drilled to allow insertion of 17 gauge 304 stainless hypodermic tubing. The inner and outer diameter of the tubing was 0.047” (1.19 mm) and 0.058” (1.47 mm), respectively. With this arrangement the stainless tubing could be easily moved up and down through the port to adjust the height of the probe in relation to the model. The probes external to the model (labeled “B” below) had a 90 o , 0.25” radius bend, ~0.5” (12.7 mm) long formed to allow the dye to be injected into the flow in a more laminar nature. The dye ports were labeled as follows; Inside the dome: A1: Probe installed so that the dye exits at the level of the Cassegrain mirror fold above the primary mirror. A2: Probe on the north side of the telescope pier at a 2” (50.8 mm) radial distance from the dome center. A3: Probe on the east side of the dome (same radial distance from the dome center as A2). A4: Probe on the south side of the telescope pier (same radial distance as A2). A5: Probe on the west side of the telescope pier (same radial distance as A2). Outside the dome: B1, B2, B3, B4, B5: Probes from North to South respectively on the upwind (east) side of the dome, 7.5 cm distant from the building measured along an east/west line. B6: Probe located directly upwind (east) on the down-slope of the terrain, 20.7 cm from the dome building as projected on the horizontal plane. B7: Probe located directly downwind (west) of the dome, approximately 4 cm from the building. Probes B1 to B7 could be inserted to be at any level, from a maximum extension in level with the mezzanine to being totally retracted in their grooves; this permitted us to visualize the flow at various heights above the terrain. 5 The UWAL 30” Water Tunnel Facility The UWAL 30” water tunnel is located in the Aerodynamics Laboratory on the UW main campus in Seattle Washington. Jack Ross (electrical engineer) is the business manager for the Kirsten Wind Tunnel as well as for the water tunnel facility. The water tunnel itself is maintained by Robert Gordon (research engineer) and was originally built by professor Robert (Bob) Breidenthal and his students. Following is the contact information for these individuals: Jack Ross: 206 543-0439, jwross@u.washington.edu Robert Gordon: 206 685-3011 (office), 206 713-2971 (cell), deepsnow@aa.washington.edu Robert Breidenthal: 206 685-1098, breident@aa.washington.edu The CFHT staff involved in performing the tests in Seattle were Karun Thanjavur, Tom Benedict and Marc Baril. Derrick Salmon observed and provided guidance via internet teleconference from Waimea.
Page 1 and 2: Canada-France-Hawaii Telescope Corp
Page 3 and 4: Figure 3: Vent dimensions in inches
Page 5: Figure 6: View through the shutter
Page 9 and 10: gradually narrows down over a lengt
Page 11 and 12: 6.3 Video capture Two Panasonic Lum
Page 13 and 14: 4. Windscreen position (3): Either
Page 15 and 16: dye probe was held near each vent l
Page 17 and 18: 10 Lessons learned • A dome shutt
Page 19 and 20: Figure 17: Path structure used to o
Page 21 and 22: 11 University of Washington 36” W
Page 23 and 24: Note: at the expected operating win
Page 25 and 26: ing everything needed. • It takes

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