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

Model Data and Control System Capabilities

• Pressure Systems
  ESP is an off the shelf electronically scanned pressure system. The system consists of numerous 32 port, rack mounted modules from +/-2.5 PSID to +500 PSID, located outside the test chamber. Each module has a check pressure to assure the module is performing correctly and can be calibrated in place using up to 5 highly accurate calibration pressures to maintain the overall system accuracy of +/-0.05% of range. This calibration is performed every 2 hours.
  For the 10x10, the following ranges are typically provided:
  • 768 ports +/- 15 PSID Barometric Ref
  • 192 ports +/- 30 PSID Barometric Ref
    
    
• Data System - Escort
  Escort, the steady state data acquisition system, uses a DEC Alpha microprocessor to provide:
  • An X window based system
  • Real time on-line acquisition of analog signals
  • Conversion of raw 10Hz filtered digitized Neff data to engineering units
  • Computed performance calculations, which can be displayed in a variety of tabular and graphical formats.
  • Limit checking on all selected channels
  • 1 second update rate
  
  Escort can stand alone to meet all secure test requirements or it can be connected to a central processing cluster, which facilitates software application development, downloading of software, uploading and storage of facility tables, post processing of data and transmitting of data to a data collector for archival storage.
  For the 10x10, Escort provides the following:
  • Accuracy for the Neff 400 is +/- 0.05% of range, while the accuracy for the Neff 600 is +/- 0.02% of range +2µv
  • Off-site access to data
  • 240 channels of which 220 are available for the test article
  • 48 temperatures from type J
  • 48 temperatures from type T
  • 48 temperatures from type R

• Dynamic Data System
  The transient data system provides multi-channel high speed digitized acquisition of rapidly changing cyclic on non-periodic impulse type events. The system consists of:
  • A front end Precision Filter amplifiers with elliptical (132 dB/oct) or linear phase (46 dB/oct) anti aliasing filters (132 dB per octave)
  • Off loading the data by FTPing, in near real time, to either our computer or yours for post processing
  • 16 Bit A/D per channel (sample and hold)
  • Throughput of 40 million samples per second
    
    
• 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
    
    
• 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
  • Video conferencing in real time
  • Workstations supplied for remote site
  • Secure network connections provided