Abstract
Studies of synthetic jets generated by compact actuators have been conducted for various applications such as drag reduction, boundary layer separation control, and multi-flow mixing. In this paper, a jet fan that utilizes synthetic jets is proposed. The flow patterns inside the jet fan are revealed, and performance curves are drawn. Static pressure distributions in the fan duct are also analyzed to discuss the process of static pressure recovery.
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Abbreviations
- b 0 :
-
Slot width = 10 × 10−3 [m]
- C pc :
-
Pressure coefficient for the continuous jet = (p − p in )/0.5ρU 2 c0 [–]
- C ps :
-
Pressure coefficient for the synthetic jet = (p − p in )/0.5ρU 2 sm0 [–]
- D d :
-
Downstream duct length = 340 × 10−3 [m]
- D u :
-
Upstream duct length = 210 × 10−3 [m]
- h :
-
Channel exit height [m]
- H :
-
Inlet/outlet channel height of the fan duct = 30 × 10−3 [m]
- l 0 :
-
Stroke length [m]
- L 0 :
-
Non-dimensional stroke length [–]
- Δp :
-
Pressure difference between the inlet and outlet [Pa]
- Q t :
-
Total flow rate at the fan outlet [m3/s]
- Re :
-
Reynolds number = U 0 b 0 /ν = 5300 [–]
- U c0 :
-
Representative velocity of the continuous jet [m/s] (see [3])
- U s0 :
-
Representative velocity of the synthetic jet [m/s] (see [3])
- U sm0 :
-
\(= \sqrt {\frac{1}{T}\mathop \smallint \limits_{0}^{{\frac{T}{2}}} u_{0}^{2} (t)dt}\) [m/s] (see [5])
- W :
-
Width of the duct = 30 × 10−3 [m]
- η c :
-
Efficiency of the continuous jet = ΔpQ t /0.5ρU 2 c0 b 0 WU c0 [–]
- η s :
-
Efficiency of the synthetic jet = ΔpQ t /0.5ρU 2 sm0 b 0 WU s0 [–]
- θ j :
-
Blowing angle = 30 [°]
- Φ s :
-
Flow rate coefficient for the synthetic jet = Q t /b 0 WU s0 [–]
- Φ c :
-
Flow rate coefficient for the continuous jet = Q t /b 0 WU c0 [–]
- Ψ s :
-
Discharge pressure coefficient for the synthetic jet = Δp/0.5ρU 2 sm0 [–]
- Ψ c :
-
Discharge pressure coefficient for the continuous jet = Δp/0.5ρU 2 c0 [–]
References
R. Holman, Y. Utturkar, Formation criterion for synthetic jets. AIAA J. 43(10), 2110–2111 (2005)
T. Koso, M. Morita, Effect of stroke and Reynolds number on the characteristics of circular synthetic jets. J. Fluid Sci. Technol. 9(2), 1–15 (2014)
K. Nishibe, Y. Fujita, K. Sato, K. Yokota, T. Koso, Experimental and numerical study on the flow characteristics of synthetic jets. J. Fluid Sci. Technol. 6(4), 425–436 (2011)
K. Fujii, A. Oyama, I. Funaki, K. Rinoie, T. Nonomura, Research on plasma actuator flow control that pays attention to localization flow, in FY2010 Annual Research Report
T. Koso, R. Nakashima, Piezoelectric fan using a synthetic jet principle. JSME No. 088-1 (2008) (in Japanese)
Acknowledgments
The authors would like to thank Mr. Youhei Nomura of the Tokyo City University and Mr. Junichiro Kikkawa of Software Cradle Co., Ltd., for their help with the numerical simulations. The present study was conducted with the support of MEXT (Functional Microstructured Surfaces Research Center of Kogakuin University) and a Grant-in-Aid for Scientific Research (No. 15K05807 and 25889057).
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Ishizawa, T., Sato, K., Nishibe, K., Yokota, K. (2016). Performance Characteristics of a Fan Using Synthetic Jets. In: Segalini, A. (eds) Proceedings of the 5th International Conference on Jets, Wakes and Separated Flows (ICJWSF2015). Springer Proceedings in Physics, vol 185. Springer, Cham. https://doi.org/10.1007/978-3-319-30602-5_14
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DOI: https://doi.org/10.1007/978-3-319-30602-5_14
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Online ISBN: 978-3-319-30602-5
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