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Flow disturbances depending on excitation frequency on a flat plate by a piezoceramic actuator

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Abstract

Flow disturbances by a piezoceramic actuator were investigated to obtain physical insights on the streamwise vortex formation and excitation frequency effects on a piezoceramic actuator. Boundary-layer measurements in wind tunnel and flow visualization in water tunnel were carried out to explore flow disturbance. Findings revealed that streamwise vortex pair was formed in the moderate excitation frequency range, accompanied by low- and high-speed regions formation in the streamwise mean velocity field. U-turbulence intensity was tremendously increased in the high excitation frequency range. As a result, the formation of streamwise vortex pair was significantly influenced by excitation frequency and thus, the flow control purpose should be considered when constructing the proper design parameters for a piezoceramic actuator.

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Abbreviations

F :

Actuator excitation frequency

F + :

Non-dimensional excitation frequency (\( fh/U_{\infty } \))

h :

Side-gap clearance of piezoceramic actuator

Re a :

Reynolds number based on the activated length of actuator

Re h :

Reynolds number based on side gap of actuator

\( U_{\infty } \) :

Free-stream velocity

\( \overline{U} \) :

Local mean streamwise velocity in boundary layer

u′:

Fluctuation component of streamwise velocity

\( \sqrt {\overline{{u'^{2} }} } /U_{\infty } \times 100 \) :

U-turbulence intensity (%)

\( \overline{V} \) :

Local mean vertical velocity in boundary layer

x :

Free-stream direction from flat plate nose

y :

Normal direction from flat plate surface

z :

Spanwise direction on flat plate surface

δ :

Boundary-layer thickness

δ * :

Boundary-layer displacement thickness

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Acknowledgments

This work was supported by the Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Education, Science, and Technology (KRF-2007-313-D00124).

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Authors and Affiliations

  1. Aircraft Development Team, Koreanair R&D Center, Daejeon, 305-811, Republic of Korea

    Dong-Ha Kim

  2. Department of Aeronautical Science and Flight Operation, Korea Aerospace University, Goyang, Gyeonggi-do, 412-791, Republic of Korea

    Jo-Won Chang

  3. School of Mechanical Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul, 133-791, Republic of Korea

    Jin-Soo Cho

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  1. Dong-Ha Kim
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  2. Jo-Won Chang
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Correspondence to Jo-Won Chang.

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Kim, DH., Chang, JW. & Cho, JS. Flow disturbances depending on excitation frequency on a flat plate by a piezoceramic actuator. J Vis 16, 111–121 (2013). https://doi.org/10.1007/s12650-013-0162-5

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