Browse Publications Technical Papers 2004-01-0803
2004-03-08

Suppression of Open-Jet Pressure Fluctuations in the Hyundai Aeroacoustic Wind Tunnel 2004-01-0803

Peak pressure fluctuation amplitudes in the ¾ open-jet test-section of the Hyundai Aeroacoustic Wind Tunnel have been reduced from root-mean-square levels equal to 6% of the test-section dynamic pressure to levels of less than 0.5% over almost the full wind speed range of the tunnel. The improvement was accomplished using a retrofit of the test-section collector. Using an analysis of the physics of the problem, it was found that the HAWT pressure fluctuations could be accurately modeled as a resonance phenomenon in which acoustic modes of the full wind tunnel circuit are excited by a nozzle-to-collector edgetone-feedback loop. Scaling relations developed from the theory were used to design an experiment in 1/7th scale of the HAWT circuit, which resulted in the development of the new collector design. Data that illustrate the benefit of the reduction in pressure fluctuation amplitudes on passenger-car aerodynamic force measurements are presented.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Scale-Model Tests on the Test Section of the Chrysler Slotted-Wall Automotive Wind Tunnel

910313

View Details

JOURNAL ARTICLE

Passive Flow Control on a Ground-Effect Diffuser Using an Inverted Wing

06-11-04-0023

View Details

TECHNICAL PAPER

Road Test Aerodynamic Instrumentation

741030

View Details

X