Airloads Measurements from a 1/4-Scale Tiltrotor Wind Tunnel Test

Blade airloads data were acquired for a 1/4-scale tiltrotor model tested at the Duits-Nederlandse Windtunnel in The Netherlands. For the first time, detailed airloads measurements were acquired for an isolated tiltrotor model utilizing 150 dynamic pressure transducers. Simultaneous acoustic measurem...

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Bibliographic Details
Main Authors: Swanson, Stephen M, McCluer, Megan S, Yamauchi, Gloria K, Swanson, Alexandra A
Format: Report
Language:English
Subjects:
ACOUSTIC MEASUREMENT
ACOUSTIC SIGNATURES
Acoustics
AEROACOUSTIC MEASUREMENTS
AERODYNAMIC LIFT
AERODYNAMIC LOADING
AERODYNAMIC NOISE
Aerodynamics
AIRCRAFT NOISE
AIRLOADS MEASUREMENTS
BLADE AIRLOADS
BLADE PRESSURE
BLADE-VORTEX INTERACTIONS
CIVIL AVIATION
DUAL VORTICES
Fluid Mechanics
FORWARD FLIGHT
NASA SHORT HAUL CIVIL TILTROTOR PROJECT
NEGATIVE LIFT
NOISE REDUCTION
PERFORMANCE(ENGINEERING)
PRESSURE MEASUREMENT
ROTOR BLADES(ROTARY WINGS)
ROTOR SHAFT ANGLE
ROTOR THRUST
SCALE MODELS
SYMPOSIA
THRUST
TILT ROTOR AIRCRAFT
TILTROTOR NOISE
TRAM(TILTROTOR AEROACOUSTIC MODEL EXPERIMENTAL PROGRAM)
V/STOL
VORTICES
WAKE
WAKE GEOMETRY
WIND TUNNEL TESTS
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Description
Summary:Blade airloads data were acquired for a 1/4-scale tiltrotor model tested at the Duits-Nederlandse Windtunnel in The Netherlands. For the first time, detailed airloads measurements were acquired for an isolated tiltrotor model utilizing 150 dynamic pressure transducers. Simultaneous acoustic measurements were made in a plane below the model rotor to correlate airloads with tiltrotor noise. Rotor performance data and wake geometry data also were acquired. Samples of the airloads data are presented for several key operating conditions. The effects of rotor thrust and model shaft angle on the blade airloads are discussed. Comparisons are made between blade pressure data, acoustic data, and laser light sheet results. Negative lift at the blade tip was found over a wide range of conditions for the tiltrotor in helicopter mode. Single and multiple blade-vortex interactions were measured and correlated with acoustic data and measured wake geometry. The data acquired during this test provide a fundamental set of aeroacoustic measurements that can be used to validate tiltrotor analyses. Presented at the European Rotorcraft Forum (25th) held in Rome, Italy, on 14-16 September 1999.