Abstract
Gravity sampling is of vital importance for sampling seabed sediments and understanding submarine sedimentary environments and resources. In this study, a new bionic sampler tube (BST) with non-smooth surface for low-disturbance and rapid sampling is presented. The BST with depressions and swellings on its surface was designed on the model of the non-smooth surface of the dung beetle. Sufficient theoretical calculations, numerical simulations, and experimental tests were carried out to study its sampling performance. The penetration depth, sample length, and frictional drag of the sampler tube were calculated. The finite element model and the coupled Eulerian-Lagrangian (CEL) method were used to analyze and compare its sampling performance. Laboratory and field gravity sampling tests were conducted and the results demonstrated the advantages of the BST in improving sampling performance and in reducing adhesion and drag.
摘要
目的
重力取样方法对实现海底沉积物取样和了解海底沉积环境和资源至关重要。本文提出一种能够实现低干扰快速取样的非光滑表面的仿生取样管, 其表面具有凹凸结构, 并对其取样性能(贯入深度、取样长度、贯入阻力和取样率)展开详细讨论和研究。
创新点
1. 基于理想理想弹塑性材料的孔扩张模型和史密斯波动方程推导取样器贯入过程的力学特征; 2. 建立数值模拟框架, 模拟重力取样过程, 并研究取样管参数对重力取样效果的影响; 3. 设计仿生非光滑重力取样管, 通过数值模拟研究非光滑形态参数的减粘降阻特性; 4. 建立试验模型, 开展室内及潮滩取样器贯入及取样试验。
方法
1. 通过实验分析, 对比常规重力取样管和仿生取样管的取样效果(图8和9); 2. 通过理论推导, 建立重力取样管和周围沉积物的力学关系(公式(3)~(7)); 3. 通过仿真模拟, 运用耦合的欧拉-拉格朗日方法在重力取样器取样过程中, 对比不同参数的取样器的取样性能, 验证所提仿生非光滑重力取样器的低扰动和快速取样性(图4~6)。
结论
1. 重力取样器的取样效果与取样管的刀口倾角、壁厚以及长径比相关, 通过数值模拟得到了不同参数对取样效果的影响; 2. 非光滑表面对仿生取样管的采样性能有明显促进作用, 通过数值模拟验证了凹坑比凸包的促进效果更好; 3. 运用参数分析方法, 对非光滑表面形态特征进行单一变量分析, 得到了较优的参数组合。
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Acknowledgments
This work is supported by the Finance Science and Technology Project of Hainan Province (No. ZDKJ202019) and the National Natural Science Foundation of China (No. 41976055).
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Yongqiang GE, Jiamin HE, Peihao ZHANG, and Ziqiang REN designed the research. Yongqiang GE, Jiamin HE, Jin GUO, Hao WANG, and Xiaoling LE processed the corresponding data. Yongqiang GE and Jiamin HE wrote the first draft of the manuscript. Ying WANG and Yuhong WANG helped to organize the manuscript. Yongqiang GE and Jiawang CHEN revised and edited the final version.
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Yongqiang GE, Jiamin HE, Jin GUO, Peihao ZHANG, Hao WANG, Ziqiang REN, Xiaoling LE, Ying WANG, Yuhong WANG, and Jiawang CHEN declare that they have no conflict of interest.
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Ge, Y., He, J., Guo, J. et al. Research on the sampling performance of a new bionic gravity sampler. J. Zhejiang Univ. Sci. A 24, 692–709 (2023). https://doi.org/10.1631/jzus.A2200442
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DOI: https://doi.org/10.1631/jzus.A2200442
Key words
- Deep-sea gravity sampling
- Bionic sampler tube (BST)
- Non-smooth surface
- Sampling performance
- Drag reduction