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Hydraulic Characteristics of Liquid Film Generated by Slit Injector

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Abstract

Liquid film generated by a jet slit injector on a wall was analyzed experimentally. Liquid film characteristics were investigated by measuring the liquid film thickness distribution for various experimental conditions. At first, the distributions were qualitatively analyzed using backlight imaging. Furthermore, quantitative measurements were performed using a liquid film thickness sensor based on the electric conductance method, which was applied to the high-speed wire-mesh method. The injection angle (15, 30, 45 °), jet velocity (7, 10.5, 13.5 m/s), and injection distance (45, 55, 65 mm) were varied, and the responses of the liquid film were observed. Having increased the injection angle, the main stream thickness decreased and the position of the maximum film thickness moved upstream. A faster jet velocity corresponded to a wider liquid film area and larger perturbation of the liquid film. The injection distance did not affect the characteristics of the liquid film considerably. A hydraulic jump effect was also observed, and a large hydraulic jump affected the film thickness distribution of the main stream. The results of this study can be applied to the development of liquid rocket engines or thrusters using the film-cooling method.

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Abbreviations

L l :

Liquid cooling film length

η :

Stability effectiveness factor

\( \dot{m}_{{\text{film}}}\) :

Mass flow rate of liquid film

D ch :

Diameter of cylindrical part of combustion chamber

C pl :

Specific heat at constant pressure of liquid coolant

T s :

Boiling point of coolant

T int :

Initial temperature of coolant

α :

Convective heat transfer coefficient

T gd :

Average temperature of combustion product

T g.ad :

Average value of temperature in the section where the liquid coolant exists

Q s :

Relative evaporation heat of liquid film

θ :

Injection angle

v :

Jet velocity

L :

Injection distance

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Authors and Affiliations

  1. Agency for Defense Development, Daejeon, South Korea

    Hyeongwon Lee

  2. Department of Aerospace Engineering, Seoul National University, Seoul, South Korea

    Gijeong Jeong

  3. School of Mechanical Engineering, Kyungnam University, Changwon, South Korea

    Hyunchang Lee

  4. Institute of Advanced Aerospace Technology, Seoul National University, Seoul, South Korea

    Youngbin Yoon

Authors
  1. Hyeongwon Lee
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  2. Gijeong Jeong
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  3. Hyunchang Lee
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Correspondence to Youngbin Yoon.

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Lee, H., Jeong, G., Lee, H. et al. Hydraulic Characteristics of Liquid Film Generated by Slit Injector. Int. J. Aeronaut. Space Sci. 20, 433–441 (2019). https://doi.org/10.1007/s42405-019-00167-4

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  • DOI: https://doi.org/10.1007/s42405-019-00167-4

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