中国物理B ›› 2016, Vol. 25 ›› Issue (6): 64301-064301.doi: 10.1088/1674-1056/25/6/064301
所属专题： Virtual Special Topic — Acoustics
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
Use of a plane jet for flow-induced noise reduction of tandem rods
Kun Zhao(赵鲲), Xi-xiang Yang(杨希祥), Patrick N Okolo, Wei-hua Zhang(张为华)
- 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
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
摘要：
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.
中图分类号: (Acoustical measurements and instrumentation)
- 43.58.+z