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首页> 外文期刊>Journal of natural gas science and engineering >Forming mechanism and radius prediction of hydraulically generated slots based on a two-walled jet
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Forming mechanism and radius prediction of hydraulically generated slots based on a two-walled jet

机译：基于两壁射流的水力生成缝隙形成机理及半径预测

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Due to its distinct capability to improve the efficiency of gas drainage, hydraulic slotting has attracted increased attention in recent years. Current attempts to predict the slotting radius are mostly based on the fluid-structure interactions of normal free jets, which is inconsistent with the practical slotting condition. To address this problem, a two-walled jet model with a rotating nozzle was proposed for simulation, focusing on the flow-field characteristics. The hysteresis effect and zone of negative pressure, which account for the forming mechanism of slots, were demonstrated based on the simulation results. Moreover, the decay equations of the centerline velocity were obtained based on the analysis of the jet developments, the effects of the confining height, and the rotating number. As a result, theoretical prediction modeling of the slotting radius was achieved. In addition, experiments using materials similar to the coalbed were also performed to validate the accuracy of the prediction model. The linear relation between the dimensionless radius and the 1/4th power law of the inlet pressure could be obtained in both the theoretical model and the experimental results. The experimental results were in good agreement with the numerical ones, except for the low-pressure condition. Finally, it can be claimed that the theoretical model is, to some extent, suitable to guide practical applications. (C) 2016 Elsevier B.V. All rights reserved.
机译：由于其独特的提高瓦斯抽采效率的能力，液压开槽近年来引起了越来越多的关注。当前预测开槽半径的尝试主要基于正常自由射流的流体-结构相互作用，这与实际的开槽条件不一致。为了解决这个问题，针对流场特性，提出了带有旋转喷嘴的两壁射流模型进行仿真。仿真结果表明了引起缝隙形成机理的滞后效应和负压区。此外，根据射流的发展，围护高度的影响和转数的分析，得出了中心线速度的衰减方程。结果，实现了开槽半径的理论预测建模。此外，还使用与煤层相似的材料进行了实验，以验证预测模型的准确性。理论模型和实验结果均可得到无量纲半径与入口压力的1/4幂律之间的线性关系。除低压条件外，实验结果与数值结果吻合良好。最后，可以说理论模型在某种程度上适合指导实际应用。 （C）2016 Elsevier B.V.保留所有权利。

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