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基于高频PIV的风力机叶尖涡初始涡量值演变规律研究
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作者 吕文春 马剑龙 +2 位作者 陈雅男 李佩林 东雪青 《中国测试》 CAS 北大核心 2023年第8期162-168,共7页
基于风向变化对于叶尖涡初始涡量值影响的敏感性至今仍不清楚,及偏航工况下其随来流风速和叶片转速变化的演变规律仍未被掌握的研究背景,以直径为1.4 m的小型水平轴风力机叶片为研究对象,利用高频PIV针对性地监测不同工况条件下叶尖涡... 基于风向变化对于叶尖涡初始涡量值影响的敏感性至今仍不清楚,及偏航工况下其随来流风速和叶片转速变化的演变规律仍未被掌握的研究背景,以直径为1.4 m的小型水平轴风力机叶片为研究对象,利用高频PIV针对性地监测不同工况条件下叶尖涡的初始涡量值,细致分析叶尖涡初始涡量值随风向、风速和叶片转速变化的演变规律。研究发现:当偏航角为0°和20°时,叶尖涡初始涡量值随叶尖速比的增大近似呈线性规律,而当偏航角介于上述区间时,变化趋势会呈明显下凹的二次曲线形式。相关理论成果的揭示对于叶片气动载荷变化机理的深入诠释以及其气动性能优化方案的掌握具有较有益的参考价值。 展开更多
关键词 风力机 叶尖 初始涡量 偏航 高频PIV
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Optimization of Rotor Assembly Process of Rotor Initial Unbalance of an Aeroengine Gas Generator
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作者 BAO Youlin LI Lixin +2 位作者 CAO Peng LI Ciying HUANG Xinglong 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2021年第1期132-139,共8页
The rotor initial unbalance of an aeroengine gas generator of turboshaft engine seriously affects rotor assembly process.To reasonably optimize rotor assembly process,the effect analyses of rotor initial unbalance of ... The rotor initial unbalance of an aeroengine gas generator of turboshaft engine seriously affects rotor assembly process.To reasonably optimize rotor assembly process,the effect analyses of rotor initial unbalance of single disc and combined discs on rotor dynamic characteristics are firstly implemented in respect of the dispersity of rotor initial unbalance.It is found that the most important factors contributing to rotor vibration are the unbalances of the first stage compressor disc and the second stage turbine disc.However,reducing the mass of two discs conflicts with the control of the whole gas generator rotor balance resulting from the unbalance increase of single components.Thus,we further analyze the key control factors of affecting rotor initial unbalance,and give the strict control measures of centrifugal impeller runout in the assembly process by adjusting the angle of central tie rod axis.The purpose of this measures to make the assembly process simpler and more effective for timely controlling rotor initial unbalance.The efforts of this study validate that the proposed method is workable for the rotor tightened by a central tie rod and possesses the significant meaning of practical application in engineering. 展开更多
关键词 turboshaft engine initial unbalance assembly process gas generator rotor control technique
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