Suppression of Open-Jet Pressure Fluctuations in the Hyundai Aeroacoustic Wind Tunnel
2004-01-0803
03/08/2004
- Event
- Content
- 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.
- Pages
- 17
- Citation
- Rennie, M., Kim, M., Lee, J., and Kee, J., "Suppression of Open-Jet Pressure Fluctuations in the Hyundai Aeroacoustic Wind Tunnel," SAE Technical Paper 2004-01-0803, 2004, https://doi.org/10.4271/2004-01-0803.