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AAPL provides three state-of-the-art test rigs: Nozzle Acoustic Test Rig (NATR), Small Hot Jet Acoustic Rig (SHJAR) and Advanced Noise Control Fan (ANCF).
Nozzle
Acoustic Test Rig (NATR)
Research
Objectives
- Supports
acoustic research on nozzle and engine components
Description
- 53-in.-diameter
free-jet acoustic wind tunnel
- Used
to test a variety of aircraft technologies at simulated take-off
and landing flight conditions up to Mach 0.30
High
Flow Jet Exit Rig (HFJER) Capabilities:
- Test nozzle concepts with diameters up to 8 inches
- Simulated
nozzle exhaust conditions up to 1425°F with a nozzle pressure
ratio of 4.5
- Airflows
up to 20 lbm/sec
- Nozzle
thrusts up to 2000 lbf
- Single
and dual air flow configurations to simulate the engine core and
fan flows of turbofan nozzle concepts
Advanced
Diagnostic Testing Capabilities:
- Temperature-pressure
traversing plume survey
- Particle
Image Velocimetry (PIV)
- Laser
Doppler Velocimetry (LDV)
- Phased-array
acoustic source identification
- Schlieren/Shawdowgraphy
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 NATR, the following ranges are typically provided:
- 352 ports +/- 15 PSID Barometric Ref
- 192 ports +/- 100 PSID Barometric Ref
- 32 port + 500 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 changes
- 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 1x1, Escort provides the following:
- Accuracy for the Neff 400 is +/- 0.05% of range
- 384 channels of which 320 are available for the test article
- 120 temperatures from CA type K thermocouples
- 96 temperatures from type N
- 24 temperatures from type R
- Acoustic Capability
NATR sits inside a geodesic dome specifically designed to allow for Far field (50 feet) acoustic measurements of nozzle generated noise. The system has an array of 24 microphones positioned in an arc from 40 degrees to 165 degrees. An overhead array allows an additional 24 microphones to be positioned at a 25 degree from Vertical in a similar arc from 40 degrees to 165 degrees.
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Small
Hot Jet Acoustic Rig (SHJAR)
Research Objectives
- Supporting jet noise fundamental research
Description
- All-in-one-platform
that economically evaluates thrusts performance, acoustic performance,
and plume turbulence characteristics of new nozzle concepts
Capabilities
- Test nozzle concepts with diameters up to 2 inches
- Simulated
nozzle exhaust conditions up to 1300°F with a nozzle pressure
ratio of 8.0
- Single
flow configurations up to 6 lb/sec
- Nozzle
thrusts up to 100 lbs for cold flow test conditions
Advanced
Diagnostic Testing Capabilities:
- Particle
Imaging Velocimetry
- Shawdowgraphy
- Schlieren
- Traversing
plume-survey
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Advanced Noise Control Fan Rig (ANCF)
Research
Objectives
- Supports
fundamental fan acoustic research
Description
- Test
bed developed to reduce noise attenuation on large low-speed fan
components
- Used
for Advanced Noise control experiments and general fan aeroacoustics
research
Capabilities
- A 4-foot 16-bladed fan driven by 125-hp electric motor up to 2600 rpm
- An inlet control device used to reduce inflow turbulence
- A system for delivering 2 lbm/sec air at 5 psi
- Flexibility to assemble test hardware in varied configurations including:
- fan blade angle setting
- stator number and spacing
- fan only assessments (no struts or stators)
- variable centerbody
- synthetic mode generation system
Measurement Capabilities include:
- 80 channels of high-speed dynamic data acquisition
- Rotating rakes for measuring upstream/downstream mode levels
- Compact acoustic arena for measuring far-field noise
- Two-component Constant Temperature Anemometer Hotwire w/ radial traversing
- Stator vane instrumented with microphones (both surfaces)
- Multiple microphones arrays on walls/centerbody
- Electrically Scanned Pressure data system for static pressure measurements
- Stator vanes instrumented for static pressure measurements
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