IMECH-IR  > 非线性力学国家重点实验室
Lattice Boltzmann Simulations of a pitch-up and pitch-down maneuver of a span-wise flexible wing in a free stream flow Read More: http://arc.aiaa.org/doi/abs/10.2514/6.2012-300
Qi DW; He GW(何国威); Liu YM
Source Publication50TH AIAA AEROSPACE SCIENCES MEETING INCLUDING THE NEW HORIZONS FORUM AND AEROSPACE EXPOSITION
2012
PagesAIAA 2012-0300
Conference Name50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition
Conference DateJAN 09-12, 2012
Conference PlaceNashville, TN, United states
AbstractA span-wise flexible wing undergoing a rapid pitch-up and pitch-down maneuver in a steady free stream is studied with a lattice Boltzmann flexible particle method (LBFPM) in a three-dimensional space at a chord based Reynolds number of 100. The pitching rates and flexibility are systematically varied, and their effects on the generated aerodynamic forces and power efficiency are explored. It is found that at a higher pitch rate average lift coefficient increases first, as flexural rigidity decreases, and arrives at a maximum, then falls down as the flexural rigidity continuously decreases, while at a lower pitch rate, no similar phenomena is observed. It seems that flexibility can be utilized to improve lift at a high reduced frequency. A small deformation at a level of 5% due to flexibility can largely improve lift force only during pitch-down time period. On the Contrary, flexibility has a negative impact on the lift during pitch-up time period. Most likely, deformation may passively and dynamically adjust the trailing edge position along the span direction, induce larger leading edge vortices (LEV) and tip edge vortices (TEV), and enhance trailing vortex shedding due to Kutta condition, thus improve lift.
KeywordAerospace Engineering Deformation Exhibitions Flexible Wings Reynolds Number Rigidity Vortex Flow Aerodynamic Forces Chord-based Reynolds Number Flexural Rigidities Free Stream Free-stream Flow Lattice Boltzmann Leading-edge Vortices Lift Coefficient Lift Force Particle Methods Pitch Rate Power Efficiency Reduced Frequency Three Dimensional Space Time-periods Tip Edge Trailing Edges Trailing Vortex
DepartmentLNM湍流
URL查看原文
Indexed ByEI
Language英语
Document Type会议论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/46825
Collection非线性力学国家重点实验室
Corresponding AuthorQi DW
Recommended Citation
GB/T 7714
Qi DW,He GW,Liu YM. Lattice Boltzmann Simulations of a pitch-up and pitch-down maneuver of a span-wise flexible wing in a free stream flow Read More: http://arc.aiaa.org/doi/abs/10.2514/6.2012-300[C]50TH AIAA AEROSPACE SCIENCES MEETING INCLUDING THE NEW HORIZONS FORUM AND AEROSPACE EXPOSITION,2012:AIAA 2012-0300.
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