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The 10x10 is specifically designed to test supersonic propulsion components such as
inlets and nozzles, propulsion system integration,and full-scale jet and rocket engines.
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The
10x10 SWT can be run in aerodynamic (closed-loop) cycle or propulsion
(open-loop) cycle. It can also run at subsonic test conditions in
aerodynamic and propulsion cycles. Subsonic test conditions range
from 5 to 240 kn and altitudes up to 50,000 feet.
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Aerodynamic
Cycle |
Propulsion
Cycle |
Altitude:
(supersonic operation) |
50,000
- 154,000 ft |
57,000
- 77,000 ft |
Reynolds
No./ft:
(supersonic operation) |
0.1
to 3.4 x 106 |
2.2
to 2.7 x 106 |
Mach
No. |
0 to 0.36
2.0 to 3.5
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Tunnel
Support Systems
High
Pressure Air
• High-Pressure Air (2600 psig) Storage: 981,000 scf
• Combustion Air: 450 psig at 12 lbm/s (300 °F max. temp)
• Service Air: 125 psig at 2 lbm/s
Hydraulics
• Model hydraulics: 3,000 psig at 75 gpm
Fuels
• Gaseous hydrogen: 1,200 psig at 2 lbm/s
• Gaseous oxygen: 1,500 psig at 23 lbm/s
• Liquid jet fuel: 40 psig 70 gpm
Vacuum/Exhaust
• Model exhaust: 20 lbm/s (2 lines at 10 lbm/s)
Model Support Systems:
- Lower Strut Assembly: angle of attack range between
-6.0 and 19.0°, height translation
- Upper Strut Assembly: angle of attack range between
-5.0 and 15.0°
- Gust
Plates: Extends local conditions down to Mach Number 1.5 or up
to Mach Number 4.1
Data Acquisition
- Steady State Acquisition
Escort, the steady state data acquisition system, uses an Alpha microprocessor to provide:
- X-Windows based displays
- Real time acquisition and display of engineering unit converted data as well as the resultant calculations
- Computed performance calculations, which can be displayed in a variety of tabular and graphical formats
- Custom tabular display pages
- Scrolling plots
- X-Y plots
- Bargraph plots
- Contour plots
- Growing plots
- Selectable limit checking with inverse video and alarming
- 1 second update rate
- Custom, application-specific features are available upon request
Salient characteristics specific to the 10x10 SWT data acquisition system are:
- Analog data acquisition with the following accuracies
- Neff 600 is +/- 0.02% of range + 2µv (192 channels)
- Neff 400 is +/- 0.05% of range (64 channels)
- Up to 256 Escort Neff channels
- Type K thermocouples (72 Upper Strut, 48 Lower Strut)
- Type J thermocouples (24 Upper or Lower Strut)
- Type T thermocouples (24 Upper or Lower Strut)
- Type R thermocouples (24 Upper Strut)
- Off-site access to data
- Other configurations and system expansion are available upon request.
Escort pressure data is acquired through Electronically Scanned Pressure (ESP) scanners. The baseline system consists of 32 port, rack mounted scanners with ranges from +/-15 PSID to +/-30 PSID, located outside the test section. These scanners are maintained at a constant temperature to extend calibrations intervals up to two hours. Digital Temperature Compensated (DTC) 32 port miniature scanners are also available for use within models.
Overall accuracies of +/-0.05% of range are achieved and confirmed with a "check pressure" that is applied to the first port of every scanner. This "check pressure" is also measured by a highly accurate, independent transducer to alarm any deviations with the pressure scanners.
Typically, 384 to 512 pressure ports are utilized per test. For most tunnel conditions, +/-15 Psid scanners are sufficient to cover the entire pressure range. For some conditions, +/-30 Psid scanners are needed for measuring total pressures. System expansion to 1024 pressures is available upon request.
- Transient Data Acquisition
The Dewetron transient data system provides multi-channel high speed digitized acquisition of rapidly changing cyclic or non-periodic impulse type events. The system consists of:
- 63 channels (expandable upon request) with 24 bit sigma-delta A/Ds per channel
- Data rates from 1,000 to 200,000 samples/ second
- Real time displays
- Tabular (Actual, Average, AC RMS, Pk-Pk, Min, Max )
- Scope
- FFT, PSD
- Strip Chart
- Others
- Near real-time data transfer to customers in standard or custom formats
- Multiple, independent display capability
- Derived "math" channels can be calculated, displayed and stored along with analog data
- The DeweSoft software can be loaded onto a customer’s Windows machine at no cost to be utilized for quick data analysis
- Flow Visualization
- Pressure sensitive paint
- Both conventional and focused Schlerien systems
- Sheet laser
- Oil flow visualization
- High speed video - up to 1000 full screen frames/s
- Particle Image Velocimetry (PIV)
- Test Article Controls
- Digital model control system with graphical interface
- Automated test article sequencing system
- Remote Access Control Room
- Real-time remote access to all data
- Secure network connections provided
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