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Study on supersonic rectangular microjets using molecular tagging velocimetry

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Abstract

In the present study, the characteristics of supersonic rectangular microjets are investigated experimentally using molecular tagging velocimetry. The jets are discharged from a convergent–divergent rectangular nozzle whose exit height is 500 μm. The jet Mach number is set to 2.0 for all tested jets, and the Reynolds number Re is altered from 154 to 5,560 by changing the stagnation pressure. The experimental results reveal that jet velocity decays principally due to abrupt jet spreading caused by jet instability for relatively high Reynolds numbers (Re > ~450). The results also reveal that the jet rapidly decelerates to a subsonic speed near the nozzle exit for a low Reynolds number (Re = 154), although the jet does not spread abruptly; i.e., a transition in velocity decay processes occurs as the Reynolds number decreases. A supersonic core length is estimated from the streamwise distribution of the centerline velocity, and the length is then normalized by the nozzle exit height and plotted against the Reynolds number. As a result, it is found that the normalized supersonic core length attains a maximum value at a certain Reynolds number near which the transition in the velocity decay process occurs.

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Authors and Affiliations

  1. Department of Energy and Environmental Engineering, Kyushu University, 6-1 Kasuga-Koen, Kasuga City, Fukuoka, 816-8580, Japan

    Taro Handa, Katsuhito Mii & Takayuki Sakurai

  2. Environmental Solution Division, Nippon Steel & Sumikin Engineering, 46-59 Nakabaru, Tobata-ku, Kitakyushu City, Fukuoka, 804-8505, Japan

    Kohei Imamura

  3. Engineering Division, JGC Corporation, 2-3-1 Minato Mirai, Nishi-ku, Yokohama City, Kanagawa, 220-6001, Japan

    Sosuke Mizuta

  4. Gas Turbine Division, Kawasaki Heavy Industries, Ltd., 1-1, Higashikawasaki-cho 3-chome, Chuo-ku, Kobe City, Hyogo, 650-8670, Japan

    Yuki Ando

Authors
  1. Taro Handa
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  2. Katsuhito Mii
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  3. Takayuki Sakurai
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  4. Kohei Imamura
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  5. Sosuke Mizuta
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  6. Yuki Ando
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Correspondence to Taro Handa.

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Handa, T., Mii, K., Sakurai, T. et al. Study on supersonic rectangular microjets using molecular tagging velocimetry. Exp Fluids 55, 1725 (2014). https://doi.org/10.1007/s00348-014-1725-5

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  • DOI: https://doi.org/10.1007/s00348-014-1725-5

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