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Experimental study on shock wave structures in constant-area passage of cold spray nozzle

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Abstract

Cold spray is a technique to make a coating on a wide variety of mechanical or electric parts by spraying solid particles accelerated through a high-speed gas flow in a converging-diverging nozzle. In this study, pseudo-shock waves in a modeled cold spray nozzle as well as high-speed gas jets are visualized by schlieren technique. The schlieren photographs reveals the supersonic flow with shock train in the nozzle. Static pressure along the barrel wall is also measured. The location of the head of pseudo-shock wave and its pressure distribution along the nozzle wall are analytically explained by using a formula of pseudo-shock wave. The analytical results show that the supersonic flow accompanying shock wave in the nozzle should be treated as pseudo-shock wave instead of normal shock wave.

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Abbreviations

D :

diameter (m)

M :

Mach number

p :

static pressure (Pa)

R e :

Reynolds number

x :

axial distance (m)

ϑ :

Momentum thickness

0:

stagnant condition

0s :

stagnation chamber

1:

just before shock wave

2:

just after normal shock wave

b :

atmospheric condition

e :

barrel exit

s :

shock wave

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Author information

Authors and Affiliations

  1. Dept. Mechanical Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima, 890-0065, Japan

    Hiroshi Katanoda (Associate Professor)

  2. Takagi Precision Dies Co., Ltd., 2-4-1 Ishida-Minami, Minami-ku, Kitakyushu, Fukuoka, 802-0836, Japan

    Takeshi Matsuoka

  3. Dept. Mechanical Systems and Environmental Engineering, The University of Kitakyushu, 1-1 Hibikino, Wakamatsu-ku, Kitakyushu, Fukuoka, 808-0135, Japan

    Kazuyasu Matsuo

Authors
  1. Hiroshi Katanoda
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  2. Takeshi Matsuoka
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  3. Kazuyasu Matsuo
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Katanoda, H., Matsuoka, T. & Matsuo, K. Experimental study on shock wave structures in constant-area passage of cold spray nozzle. J. of Therm. Sci. 16, 40–45 (2007). https://doi.org/10.1007/s11630-007-0040-3

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  • DOI: https://doi.org/10.1007/s11630-007-0040-3

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