Simulation Study of the Transport Characteristics of the Ice Core in Ice Drilling with Air Reverse Circulation
Simulation Study of the Transport Characteristics of the Ice Core in Ice Drilling with Air Reverse Circulation
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DOI：
10.3390/jmse10111603
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发表时间：
2022-10
影响因子：
2.9
通讯作者：
Mengke Wang;Wenbo He;Jin Cao;Bo Qi;Jingchao Chen;P. Cao
中科院分区：
文献类型：
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作者：
Mengke Wang;Wenbo He;Jin Cao;Bo Qi;Jingchao Chen;P. Cao
空气反循环冰芯钻进是利用高速气流将冰芯从孔底沿着钻杆中心通道输送到地面的一项很有前途的技术。了解冰芯如何通过管道移动是这项技术的关键，以便计算气动参数。本文采用实验研究和CFD动网格技术分析了冰芯的输运过程和流场特性。为了证明动网格技术的正确性，将仿真结果与实验结果进行了验证，发现所有仿真数据与实验数据趋势一致，最大误差小于10%。根据这项研究，一旦冰芯的速度在整个运输过程中达到最大值，它就不会改变。冰芯的最大速度随直径比的增大而增大，随长径比的增大而减小，偏心率对最大速度没有影响。当风速达到21 m/s时，长径比为2的冰芯直径比从0.80增加到0.92，最大流速从8.92 m/s增加到17.45 m/s。数据拟合表明，方程Vmax=−1.04V0 + 1.04Va描述了冰芯的最大速度Vmax和空气速度Va之间的关系。最后，通过CFD模拟得到冰芯的悬浮速度模型，计算出冰芯的悬浮速度V0。
Ice core drilling with air reverse circulation is a promising technology that uses high-speed airflow to transport the ice core from the bottom of the hole along the central passage of the drill pipe to the surface. Understanding how the ice core moves through the pipe is crucial for this technology in order to calculate the pneumatic parameters. In this paper, experimental study and the CFD dynamic mesh technique are used to analyze the ice core transport process and flow field characteristics. In order to prove the correctness of the dynamic mesh technique, the simulation results were verified with the experimental results, and it was found that all the simulation data were in agreement with the experimental data trend, and the maximum error was less than 10%. According to the study, once the ice core’s velocity reaches its maximum throughout the transport process, it does not change. The ice core’s maximum velocity increases with the diameter ratio and decreases with the length-to-diameter ratio, while eccentricity has no impact on the maximum velocity. When the air velocity reaches 21 m/s, the diameter ratio for the ice core with a length-to-diameter ratio of 2 increases from 0.80 to 0.92, and the maximum velocity increases from 8.92 m/s to 17.45 m/s. Data fitting demonstrates that the equation Vmax=−1.04V0 + 1.04Va describes the relationship between the ice core’s maximum velocity, Vmax, and air velocity, Va. Finally, we obtain the ice core’s suspension velocity model using CFD simulation to calculate the suspension velocity, V0.