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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
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

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
Abstract  

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)  
Fund: 

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

Corresponding Authors:  Xi-xiang Yang     E-mail:  nkyangxixiang@163.com

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

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