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

Rennie, Mark R.; Kim, Moo‐Sang; Lee, Jung-Ho; Kee, Jung-Do

doi:10.4271/2004-01-0803

Cited by 23 publications

(25 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Efforts to understand the physics and to reduce the impact of those low frequency fluctuations on data quality and wind tunnel operation have been reported in many recent technical papers (Arnette and Buchanan, 1999;Wickern et al, 2000;Rennie et al, 2004;von Heesen and Höpfer, 2000).…”

Section: Introductionmentioning

confidence: 99%

Reduction of 3/4 open jet low-frequency fluctuations in the S2A wind tunnel

Amandolèse

Vartanian²

2010

Journal of Wind Engineering and Industrial Aerodynamics

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Reduction of 3/4 open jet low-frequency fluctuations in the S2A wind tunnel

Amandolèse

Vartanian²

2010

Journal of Wind Engineering and Industrial Aerodynamics

View full text Add to dashboard Cite

“…It is important to note though, that these large scale structures can carry significant energy and worsen the flow quality, including the turbulence level, beyond acceptable (e.g. [6][7][8]).…”

Section: Introductionmentioning

confidence: 99%

Modal Decomposition of Wind-Tunnel Fluctuations

Fahland,

Elsner,

Weber

et al. 2023

AIAA AVIATION 2023 Forum

View full text Add to dashboard Cite

Low-frequency wind-tunnel fluctuations occur especially in open-jet closed-return circuit wind-tunnels. The present work addresses identification of modes within the frequency and spatial domain of these fluctuations. Experimental data is collected in a full scale tunnel and its scale model by the means of distributed, synchronized pressure measurements. Application of spectral proper orthogonal decomposition revealed the existence of multiple acoustic and convective modes. This in part confirms previous findings which were based on frequency analysis only, such as the existence of the edge-tone feedback mechanism for low speed windtunnels. For other idealizations, such as the wind-tunnel acting as Helmholtz resonator, no proof could be found. With this understanding improvement measures were developed, tested and improved. During this process modal decomposition led the way to fluctuation reductions of over 6dB, i.e. 50%.

show abstract

“…It is necessary to control it under a low level. Researchers have developed some effective control measures, which have already been applied in some current wind tunnels (Amandolese and Vartanian 2010;Bergmann, Kaiser, Wagner 2008;Rennie, Kim, Lee, Kee 2004;John 2002;Gerhand, Wilhelm, Steppen 2000;Stephen, Tony, Michael 1999). For example, opening ring in the front of first diffuser and changing the structure of the collector are well-proven means to control the low frequency pulsation.…”

Section: Introductionmentioning

confidence: 99%

Effects of Reinjection on Flow Field of Open Jet Automotive Wind Tunnel Test Section

Dai

Zhong

et al. 2018

JAFM

View full text Add to dashboard Cite

The distributions of axial static pressure coefficient and flow fluctuation in the test section which affect aerodynamic measurement in an open jet wind tunnel is presented. In this paper, the flow characteristics of the open jet automotive wind tunnel with passive reinjection and active reinjection were simultaneously investigated by experimental and numerical approaches. The axial static pressure coefficient variations can be reduced by passive or active reinjection, and recycle flow returns to the test section from the loophole is the main reason. The more mass flow rate improves the effect. Meanwhile, it is found that the improvement of the axial static pressure coefficient by reinjection is always better in the condition of 0° collector angle. The turbulence intensity in the collector angle of 15° is lower than that of 0°, and the reinjection increases the turbulence intensity near the collector. The increase of the turbulence intensity by active reinjection in the collector angle of 0° is greater than the collector angle of 15° for the 3.28° diffusion angle. There are some peaks emerging at the frequencies of 40 Hz and 50 Hz, which indicates that the flow field fluctuations may have induced structural vibration. The peaks at several frequencies increase when the passive and active reinjection are conducted, and the increase of peak is correlate with the increase of the reinjection flow rate. Due to the reduction of average static pressure coefficient and increase of flow fluctuations, the application of passive and active reinjection should be considered at the same time.

show abstract

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

Cited by 23 publications

References 9 publications

Reduction of 3/4 open jet low-frequency fluctuations in the S2A wind tunnel

Reduction of 3/4 open jet low-frequency fluctuations in the S2A wind tunnel

Modal Decomposition of Wind-Tunnel Fluctuations

Effects of Reinjection on Flow Field of Open Jet Automotive Wind Tunnel Test Section

Contact Info

Product

Resources

About