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Atomization and Sprays
Facteur d'impact: 1.262 Facteur d'impact sur 5 ans: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN Imprimer: 1044-5110
ISSN En ligne: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.2012004134
pages 645-653

EXPERIMENTAL STUDY ON ROCK BREAKING BY A COMBINED ROUND STRAIGHT JET WITH A SWIRLING JET NOZZLE

Dongjun Ma
School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0150, USA
Gensheng Li
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, P.R. China
Xiaoning Zhang
Research Institute of Petroleum Exploration & Development, Beijing 100083, People's Republic of China
Zhongwei Huang
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, PR. China

RÉSUMÉ

The combined straight jet with swirling jet, generated by combined round straight jet with swirling jet nozzle with a disk, is a new kind of high-efficient jet. The disk has a central orifice and three spiral slots. When high-velocity fluid flows through the disk, the axial motion of fluid is created by the central orifice, while the swirling motion of fluid is created by the slots. When the fluid with both axial and swirling motion flows out of the nozzle, the combined round straight jet with swirling jet is created. The combined round straight jet with swirling jet inherits both the large impact area of a swirling jet and the deep penetration depth of a round straight jet. In order to break rock more effectively, the influences of nozzle structural parameters, standoff distance, and jet pressure on the rock erosion effect were researched by a rock breaking experiment. The experimental results showed that the combined round straight jet with swirling jet nozzle with diameter of 2 mm, chamber length of 8 mm, and extension angle of 60 deg can generate the largest rock breaking volume. The optimal standoff distance is 12 mm. The rock breaking area and penetration depth increased sharply with the increase of jet pressure.


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