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

Chinese Physics B 2016年第6期25卷 270-278页

作者：赵鲲杨希祥 Patrick N Okolo 张为华 College of Aerospace Science and Engineering National University of Defence Technology Changsha 410073 China Department of Mechanical and Manufacturing Engineering Trinity College Dublin University of Dublin Dublin 2 Dublin Ireland 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 *** use of a plane jet is proposed to reduce this flow-induced *** rods with different gap widths were utilized as the test *** acoustic and aerodynamic tests were conducted in order to validate this *** test results proved that overall noise emission from tandem rods could be lowered and tonal noise could be removed with use of the plane ***,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 ***,aerodynamic tests fundamentally studied explanations for the noise ***,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 ***,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 *** study confirmed the potential use of a plane jet towards landing gear noise reduction.

关键词： plane jet tandem rods flow-induced noise reduction vortex shedding

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FLOW FIELD ANALYSES OF plane jet AT LOW REYNOLDS NUMBERS USING LATTICE BOLTZMANN METHOD

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Transactions of Nanjing University of Aeronautics and Astronautics 2012年第3期29卷 199-206页

作者：赵立清孙建红许常悦南京航空航天大学航空宇航学院

A two-dimensional（2-D） incompressible plane jet is investigated using the lattice Boltzmann method（LBM） for low Reynolds numbers of 42 and 65 based on the jet-exit-width and the maximum jet-exit-velocity. The results show that the mean centerline velocity decays as x-1/3 and the jet spreads as x2/3 in the self-similar region, which are consistent with the theoretical predictions and the experimental data. The time histories and PSD analyses of the instantaneous centerline velocities indicate the periodic behavior and the interaction between periodic components of velocities should not be neglected in the far field region, although it is invisible in the near field region.

关键词： plane jet low Reynolds number lattice Boltzmann method

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OSCILLATION PHENOMENA IN FAR FIELD REGION OF plane jetS AT LOW REYNOLDS NUMBERS

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Transactions of Nanjing University of Aeronautics and Astronautics 2013年第1期30卷 17-23页

作者：赵立清孙建红许常悦 College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics

Oscillation phenomena in far field region of plane jets are studied by lattice Boltzmann method over a range of Reynolds numbers （Re） from 16 to 65. Numerical results show that the instantaneous centerline velocities show periodic oscillation behavior in far field region when Re〉38. In contrast, the periodic behavior is invisible in corresponding flow field when Re≤38. For the cases of Re≤38, the exchange of momentum due to straining mo- tion gradually dominates the downstream flow filed, which qualitatively suggests the possibility of iet instability.

关键词： plane jet oscillation low Reynolds number lattice Bottzmann method

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