基于微细梁振动位移的微尺度射流测速方法 |
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引用本文: | 周俊虎,汪洋,杨卫娟,刘建忠,王智化,岑可法.基于微细梁振动位移的微尺度射流测速方法[J].气动实验与测量控制,2010(1):100-104. |
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作者姓名: | 周俊虎 汪洋 杨卫娟 刘建忠 王智化 岑可法 |
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作者单位: | 浙江大学能源洁净利用国家重点实验室,杭州310027 |
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基金项目: | 基金项目:国家自然科学基金资助项目(50606030);高等学校博士学科点专项科研基金资助项目(20060335124);高等学校学科创新引智计划资助项目(B08026);国家杰出青年基金项目(50525620) |
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摘 要: | 实验研究微尺度射流流场中微细梁发生的振动过程,并提出基于该原理测量微尺度射流速度。实验使用长度56.2ram、直径约0.07mm铜丝作为微细梁,使用直径约0.36mm喷管产生的微尺度射流。使用高速摄影仪观察射流流速在2.7~27.3m/s间梁振动的变化。试验结果发现当射流喷嘴对准梁3/5处时,振动过程中振幅随射流速度上升。而当射流喷嘴对准梁的9/10和3/4处时,在高流速下,振幅不随流速上升。使用霍尔传感器和磁铁测量梁的振动,当喷嘴对准梁的3/4处,霍尔传感器输出电压有效值随射流流速线性增长。但在其他位置,由于磁铁改变了梁的均匀结构,振动随流速的变化不规律。
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关 键 词: | 微尺度 微细梁 测速 霍尔电压 |
Vibration of micro cantilever applied in micro scale jet velocity measurement |
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Authors: | ZHOU Jun-hu WANG Yang YANG Wei-juan LIU Jian-zhong WANG Zhi-hua CEN Ke-fa |
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Institution: | (State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027,China) |
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Abstract: | In the experiment, the vibration of a micro cantilever varying with the jet velocity is studied. It is suggested to measure the micro scale jet velocity based on this mechanism. A copper thread with length 56.2mm, diameter 0.07ram is used as the micro cantilever. The jet velocity comes from a micro nozzle with diameter 0.36ram. The vibration of cantilever is investigated with a high-speed camera while the jet velocity varying between 2.7-27.3m/s. The result shows that the vibration amplitude increase with the jet velocity while the nozzle is amied at 3/5 of the cantilever length. But while the nozzle is aimed at 9/10 or 3/5 of the cantilever length, the amplitude stops increasing at high jet veloicty. A hall sensor and a magnet are used to measure the vibration. The output voltage increases linearly with the jet velocity, while the nozzle is aimed at the 3/4 of the cantilver lenth. But at the other positions, the viburation is not inneratic because the attached magnet change the mass distribuion of the cantilever. |
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Keywords: | micro scale micro cantilever velocity measurement Hall voltage |
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