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Chin. Phys. B, 2016, Vol. 25(6): 064301    DOI: 10.1088/1674-1056/25/6/064301
Special Issue: Virtual Special Topic — Acoustics

Use of a plane jet for flow-induced noise reduction of tandem rods

Kun Zhao(赵鲲)1,2, Xi-xiang Yang(杨希祥)1, Patrick N Okolo2,3, Wei-hua Zhang(张为华)1
1 College of Aerospace Science and Engineering, National University of Defence Technology, Changsha 410073, China;
2 Department of Mechanical and Manufacturing Engineering, Trinity College Dublin, University of Dublin, Dublin 2, Dublin, Ireland;
3 Energy and Power Technology Division, Department of Mechanical Engineering, University of Nigeria, Nsukka, Nigeria

Unsteady wake from upstream components of landing gear impinging on downstream components could be a strong noise source. The use of a plane jet is proposed to reduce this flow-induced noise. Tandem rods with different gap widths were utilized as the test body. Both acoustic and aerodynamic tests were conducted in order to validate this technique. Acoustic test results proved that overall noise emission from tandem rods could be lowered and tonal noise could be removed with use of the plane jet. However, when the plane jet was turned on, in some frequency range it could be the subsequent main contributor instead of tandem rods to total noise emission whilst in some frequency range rods could still be the main contributor. Moreover, aerodynamic tests fundamentally studied explanations for the noise reduction. Specifically, not only impinging speed to rods but speed and turbulence level to the top edge of the rear rod could be diminished by the upstream plane jet. Consequently, the vortex shedding induced by the rear rod was reduced, which was confirmed by the speed, Reynolds stress as well as the velocity fluctuation spectral measured in its wake. This study confirmed the potential use of a plane jet towards landing gear noise reduction.

Keywords:  plane jet      tandem rods      flow-induced noise reduction      vortex shedding     
Received:  27 September 2015      Published:  05 June 2016
PACS:  43.58.+z (Acoustical measurements and instrumentation)  
  47.32.cb (Vortex interactions)  
  43.50.+y (Noise: its effects and control)  

Project partially supported by the European Union FP7 CleanSky Joint Technology Initiative “ALLEGRA” (Grant No. 308225).

Corresponding Authors:  Xi-xiang Yang     E-mail:

Cite this article: 

Kun Zhao(赵鲲), Xi-xiang Yang(杨希祥), Patrick N Okolo, Wei-hua Zhang(张为华) Use of a plane jet for flow-induced noise reduction of tandem rods 2016 Chin. Phys. B 25 064301

[1] Crighton D G 1991 Airframe noise (Cambridge: Cambridge University Press) pp. 391-447
[2] Macaraeg M, 1998 4th AIAA/CEAS Aeroacoustics Conference, June 2-4, 1998, Toulouse, France, 982224
[3] Li Y, Wang X and Zhang D 2013 Chinese Journal of Aeronautics 26 249
[4] Nicolas M, Francois P j, Choi C, Malcolm S Werner D and Christelle S 2006 12th AIAA/CEAS Aeroacoustics Conference, May 8-10, Cambridge, Massachusetts, 20062623
[5] Dobrzynski W, Schoning B, Chow L C, Wood C, Smith M and Seror C 2006 International Journal of Aeroacoustics 5 233
[6] Chow L C, Foot D and Wood C (U.S Patent) 6619587 [2003-09-16]
[7] Fitzpatrick J 1985 Journal of Sound and Vibration 99 425
[8] Okolo, P, Zhao, K, Neri, E., Kennedy, J and Bennett, G J 2015 22nd International Congress on Sound and Vibration, July 12-16, Florence, Italy
[9] Li X G, Yang D K and Wang Y 2011 Chin. Phys. B 20 064302
[10] Chen Y, Huang Y Y, Chen X Q, Bai Y Z and Tan X D 2015 Chin. Phys. B 24 054302
[11] Zhao K, Neri E, Okolo P, Kennedy J and Bennett G J 2015 Proceedings of the 22nd International Congress on Sound and Vibration, July 12-16, Florence, Italy, p. 1414
[12] Heller H H and Dobrzynski W M 1977 Journal of Aircraft 14 768
[13] Angland D, Zhang X and Goodyer M 2012 AIAA Journal 50 1670
[14] Zdravkovich M M 2003 Flow around Circular Cylinders: Volume 2: Applications (Oxford: Oxford University Press) pp. 1064-1100
[15] Eret P and Meskell C 2012 Advances in Acoustics and Vibration 2012 689379
[16] Robert D 2006 m10th AIAA/CEAS Aeroacoustics Conference, May 23-25, 2004, Vancouver, British Columbia, Canada, 20042955
[17] Bruun H H 1996 Measurement Science and Technology 7 10
[18] Bearman P 1971 DISA Information 11 25
[19] Kavsaoglu M, Schetz J and Jakubowski A 1989 Journal of Aircraft 26 539
[20] Ramaprian B 1983 “Turbulence measurements in plane jets and plumes in crossflow”, Ph. D. Dissertation (Iowa Institute of Hydraulic Research, The University of Iowa)
[21] Jones W and Wille M 1996 Int. j. heat fluid flow 17 296
[22] Bhattacharyya K and Pop I 2014 Chin. Phys. B 23 024701
[23] Ishak A, Nazar R and Pop I 2007 Chin. Phys. Lett. 24 2274
[24] Hutcheson F and Brooks T 2012 International Journal of Aeroacoustics 11 291
[25] David L, Mehdi K, Meelan C, Florence H, Thomas B, Daniel S 2007 13th AIAA/CEAS Aeroacoustics Conference, May 21-23, 2007, Rome, Italy, 20073450
[26] Luther J, Mehdi K, Meelan C and Cathy M 2005 11th AIAA/CEAS Aeroacoustics Conference, May 23-25, Monterey, California, USA, 20052812
[27] Williamson C H 1996 Ann. Rev. Fluid Mech. 28 477
[1] Analytical investigation on mean and turbulent velocity fields of a plane jet
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