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1. Advanced TechnologySolar Telescope ENCLOSURE
2. Overview & Charge to Committee (Mark Warner)
6 Major Parts of SDR:
SRD Flow Down & Error Budgets (Rob Hubbard)
Specifications (LeEllen Phelps)
Reference Designs (LeEllen)
Lunch
Performance & Analyses (LeEllen)
Contracting Approach (Mark)
Risk Areas (LeEllen)
Plans for Future Work (LeEllen)
AOB
Executive Session (closed session for committee members)
Feedback from Committee (All Hands)
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Dinner Explain Ill get back to the 5 parts in a moment
We have a couple of short breaks scheduled throughout the day, plus a lunch at noonExplain Ill get back to the 5 parts in a moment
We have a couple of short breaks scheduled throughout the day, plus a lunch at noon
3. Function: Suppress seeing Outline here:
What are we talking about?
Thermal Performance I
Gemini tests
MuSES modeling
Validation using Gemini data
Hybrid
Retractable
Is this good enough?
Seeing Performance
Formulation: thermally disturbed layers
Chart, in terms of average temperature of upstream skin
BBSO tests to verify/sanity check
Thermal Performance II
Hardware modifications, hybrid
Hardware modifications, retractable
MuSES results w/mods
Summarize
Outline here:
What are we talking about?
Thermal Performance I
Gemini tests
MuSES modeling
Validation using Gemini data
Hybrid
Retractable
Is this good enough?
Seeing Performance
Formulation: thermally disturbed layers
Chart, in terms of average temperature of upstream skin
BBSO tests to verify/sanity check
Thermal Performance II
Hardware modifications, hybrid
Hardware modifications, retractable
MuSES results w/mods
Summarize
5. Overview:
Requirements and Goals
Configuration for analyses
CFD Results
Phases 2, 3 at Fluent Inc. (Phase 1 was an old design)
Validation via CosmosFloWorks
6. Requirements and Goals Minimum of 20 enclosure volumes per hour passive air flushing
For wind speeds greater than 2 m/s from any azimuth direction
No stagnant dead zones inside enclosure
Ability to throttle down interior air flow as outside wind speed increases (max interior air velocity = 5 m/s)
No direct sunlight to enter enclosure
System should fully seal out weather during non-operational periods (e.g., overnight, rainy periods)
Low-risk, high-reliability system
COTS-type equipment
Equipment easily serviced, replaced
8. CFD Results: Fluent, Phase 2 Three wind directions : East, South, and South East
One wind speed: 5 m/s (11.2 MPH)
Shutter angle: 45-degrees elevation
Results meet requirements and goals:
~36-240 enclosure volumes/hour (requirement: 20)
Minimal flow up side of enclosure
Minimal recirculation inside enclosure
Mostly single-pass recirculation
Good air flow through dome centerline (i.e., telescope location)
30-40% of outside wind speed from floor to ceiling
9. Velocity Vectors
10. CFD Results: Fluent, Phase 3 Additional Runs
North flow cases (with rear vent/access door)
Shutter angle effects (15 deg from horizon, zenith)
E, S, N, SE flow cases
Telescope obstruction effect
One wind speed: 5 m/s (11.2 MPH)
Results consistent with Phase 2 results:
~35-220 enclosure volumes/hour (requirement: 20)
Flow mostly thru flow, with some single-pass recirculation
TMA causes a minor flow disruption
Primarily at base of TMA, below mirror
Some slowing of flow downstream of TMA
Minor reduction (~3-5%) of total throughput through enclosure
Good flow/flushing across optical path of TMA
12. Velocity Contours with TMA
16. CFD Results: Validation
17. Overview:
MuSES
for performance analyses
for design development
Other tools
for Lower Enclosure
for optimization
Results
M3 designs
Value Engineering
18. MuSES Modeling: Validation at Gemini North
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