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Supersonic piston synthetic jets with single/multiple orifice

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Abstract

We experimentally study a high-speed synthetic jet actuator consisting of a cylinder with an orifice plate at the top and a piston driven by a motor. The experiments are performed for four orifice plates with a single hole or multiple holes with different diameters. The characteristics of the synthetic jets are investigated with cylinder pressure measurement and flow visualization based on the shadowgraph method, where the Mach disks in the shadowgraph images are used for estimating the Mach number of supersonic synthetic jets. A total orifice area on the plate affects cylinder pressure and jet Mach number. The number of the orifices has a direct influence on the downstream region where the jets from different orifices interact with each other. A smaller total orifice area results in a higher jet Mach number, a larger spatial extent of Mach disks, and an earlier formation of the Mach disks in one cycle. The influences of total orifice area are well explained by larger/smaller values of maximum/minimum values of the cylinder pressure for a smaller total orifice area. It is also found that the maximum jet Mach number is represented as a function of the maximum cylinder pressure even for different orifice configurations. Furthermore, for a given operating frequency, the maximum cylinder pressure increases almost linearly with the stroke length divided by an effective diameter of the total orifice area independently of the number of the orifices.

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Acknowledgements

The authors would like to acknowledge Prof. A. Glezer for helpful comments on experimental apparatus and Drs. K. Mori and A. Iwakawa for their suggestions in the experiments. This work was supported by JSPS KAKENHI Grant no. 16K18013 and by Paloma Environmental Technology Development Foundation.

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Authors and Affiliations

  1. Department of Aerospace Engineering, Nagoya University, Nagoya, 464-8603, Japan

    Hiroyuki Sakakibara, Tomoaki Watanabe & Koji Nagata

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  1. Hiroyuki Sakakibara
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  2. Tomoaki Watanabe
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  3. Koji Nagata
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Correspondence to Tomoaki Watanabe.

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Sakakibara, H., Watanabe, T. & Nagata, K. Supersonic piston synthetic jets with single/multiple orifice. Exp Fluids 59, 76 (2018). https://doi.org/10.1007/s00348-018-2529-9

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  • DOI: https://doi.org/10.1007/s00348-018-2529-9

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