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TECHNICAL PAPERS

High-Speed Observation of a Cavitating Jet in Air

[+] Author and Article Information
Hitoshi Soyama

Department of Mechanical Engineering,  Tohoku University, 6-6-01 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japansoyama@mm.mech.tohoku.ac.jp

J. Fluids Eng 127(6), 1095-1101 (Jul 14, 2005) (7 pages) doi:10.1115/1.2060737 History: Received September 27, 2004; Revised July 14, 2005

The use of cavitation impact is a practical method for improving the fatigue strength of metals in the same way as shot peening. In the case of peening using cavitation impact, cavitation is produced by a high-speed submerged water jet with cavitation, i.e., a cavitating jet. A cavitating jet in air was successfully generated by injecting a high-speed water jet into a low-speed water jet injected into air using a concentric nozzle. In order to investigate the various appearances of cavitating jets in air, an observation was carried out using high-speed photography and high-speed video recording. In this study, periodical shading of the cavitation cloud was observed and the frequency of the shading was found to be a function of the injection pressure of the low-speed water jet. Unsteadiness of the low-speed water jet, which is related to the periodical shading of the cloud, was also observed.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

Test apparatus for the cavitating jet in air

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Figure 3

Jet performance as a function of standoff distance sH(pH=20MPa)

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Figure 4

Erosion pattern induced by a cavitating jet in air (pH=20MPa, pL=0.15MPa, sH=30mm)

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Figure 5

Jet performance as a function of the injection pressure of the low-speed water jet pL(pH=20MPa)

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Figure 6

Appearance of a cavitating jet in air (pH=20MPa, pL=0.15MPa)

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Figure 7

Changing appearance of a cavitating jet in air with time (pH=20MPa, pL=0.15MPa)

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Figure 8

Wavelength λw of the wavy pattern of the low-speed water jet (pH=20MPa)

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Figure 9

Variation in the appearance of a cavitating jet in air with the injection pressure of the low-speed water jet pL(pH=20MPa)

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Figure 10

Variation of the shedding frequency of the wavy pattern fw with the injection pressure of the low-speed water jet pL(pH=20MPa)

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Figure 11

Variation of the shedding interval of the wavy pattern τw with the flow velocity of the low-speed water jet νL(pH=20MPa)

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Figure 12

Aspects of a cavitating jet in air with the injection pressure of the high-speed water jet pL(pL=0.15MPa)

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