Active control of wall-bounded turbulence for drag reduction with piezoelectric oscillators

Active control of wall-bounded turbulence for drag reduction with piezoelectric oscillators
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利用压电振荡器主动控制壁面湍流以减少阻力

DOI:
10.1088/1674-1056/27/7/074701
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发表时间:
2018-07
期刊:
影响因子:
1.7
通讯作者:
Cui Xiaotong
Cui Xiaotong
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Bai Jianxia;Jiang Nan;Zheng Xiaobo;Tang Zhanqi;Wang Kangjun;Cui Xiaotong

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对湍流边界层近壁区域相干结构爆裂的主动控制进行了实验研究。通过双压电振子的同步和异步振动,分析了Re θ= 2766时双压电振子的周期振动对平均速度分布、减阻率和相干结构爆裂的影响。100 V/160 Hz-ASYN情况优于实验中的其他条件,相对减阻率为18.54% 很令人兴奋。在相同电压和频率下,异步振动比同步振动减阻更有效。在所有受控情况下,大尺度的相干结构受到调节,而小尺度结构受到刺激。脉动速度显着增加。在频率为 160 Hz 的 ASYN 控制条件下可以看到对相干结构的周期性调节效应。
An experimental investigation was performed for active control of coherent structure bursting in the near-wall region of the turbulent boundary layer. By means of synchronous and asynchronous vibrations with double piezoelectric vibrators, the influence of periodic vibration of the double piezoelectric vibrators on the mean velocity profile, drag reduction rate, and coherent structure bursting is analyzed at Re θ= 2766. The case with 100 V/160 Hz-ASYN is superior to other conditions in the experiment and a relative drag reduction rate of 18.54% is exciting. Asynchronous vibration is more effective than synchronous vibration in drag reduction at the same voltage and frequency. In all controlled cases, coherent structures at large scales are regulated while the small-scale structures are stimulated. The fluctuating velocity increases significantly. A periodic regulating effect on the coherent structure can be seen in the ASYN control conditions at the frequency of 160 Hz.
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