Water Hammer Characteristics of Self-Rotating Cascade Jets Impacting on Rock.
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| Title: | Water Hammer Characteristics of Self-Rotating Cascade Jets Impacting on Rock. |
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| Authors: | Zhang, Di1,2 (AUTHOR), Ge, Zhaolong1,2 (AUTHOR), Zhou, Zhe1,2 (AUTHOR) zhouzhe@cqu.edu.cn, Liu, Xiangjie1,2 (AUTHOR) |
| Source: | Rock Mechanics & Rock Engineering. Apr2024, Vol. 57 Issue 4, p2681-2693. 13p. |
| Subjects: | Water hammer, Analytic geometry, Water pressure, Elasticity, Water jets |
| Abstract: | Water jets impacting the rock cause water hammer effects, resulting in significant damage to the rock. The self-rotating cascade jet breaks rocks through rotational impact, but its water hammer characteristics are still uncertain. The models for water hammer pressure and its duration and dimensionless action length of a cascade jet were constructed using dynamic elasticity and analytic geometry. Moreover, rock-breaking experiments were conducted using a developed cascade nozzle bit to validate the models. The results show that the impact of self-rotating cascade jets on the rock does not generate continuous water hammer pressure. The water hammer characteristics and rock-breaking capacity of the designed jets are ranked as follows: the central jet is the strongest, the first cascade jet is the second strongest, and the second cascade jet is the weakest. The characteristics of the water hammer and rock-breaking capacity for the self-rotating cascade jet increase as the rotational speed and the eccentric distance decrease, the pressure, the impact angle, and the radius increase. The results can lay a theoretical foundation for understanding the rock-breaking mechanism of the self-rotating cascade jet and developing new types of pulsed jets. Highlights: Water hammer models were developed and validated for a self-rotating cascade jet impinging on a rock. The water hammer pressure of a self-rotating cascade jet impinging on the rock was not sustained. The influence of jet property parameters on the water hammer characteristics was demonstrated. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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