考虑多级流速下的岩石粗糙单裂隙渗流传热特性试验研究

doi:10.13722/j.cnki.jrme.2017.1405

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摘要为系统研究增强型地热系统深部干热岩裂隙表面特征和热工质间的对流换热情况，基于N. Barton的JRC经典剖面和先进的3D打印技术，通过在岩样裂隙表面有规律地设置不同方向的粗糙度，以蒸馏水为热工质，考虑流体热物性变化，在人工岩样裂隙中进行多级流速下的对流换热试验。结果表明：低水平围压下，岩石单裂隙渗流特性呈线性演化规律，渗透压力与流速、温度呈正相关，与岩样粗糙度呈负相关；粗糙岩样中围压一定时，温度场和流场的耦合作用对流体出口温度影响较大；短边粗糙度相同时，长边粗糙度的增大会强化换热，且不同方向粗糙度主导的相邻岩样换热系数差及幅值比不一样；裂隙表面粗糙度大小对换热效果影响较大，此外，粗糙度的方向性通过控制渗流路径和有效换热面积来改变换热强度，说明粗糙度大小及各向异性在岩石渗流传热中是不可忽略的因素。

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	黄奕斌1
	张延军1
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	于子望1
	马跃强1
	张驰1
	李良振1

关键词 ：岩石力学, 节理粗糙度系数, 人工岩样, 单裂隙, 多级流速, 对流换热系数

Abstract：In order to investigate systematically convection heat transfer situation between fracture surface features of deep hot dry rock in enhanced geothermal system and work fluid，convective heat transfer experiments with distilled water considering thermophysical properties variations under multi-level flow rates were conducted in single fracture of artificial rocks based on N. Barton?s JRC model and advanced 3D printing technology，which can achieve that the roughness was set regularly different directions in fracture surface of rocks. The results show that the seepage characteristics of single rock fractures emerge a linear evolution under low-level confining pressure. Osmotic pressures were positively correlated with flow rates and temperatures，and negative correlation with rock roughness. The coupling between temperature field and flow field has a great influence on the fluid outlet temperature under constant confining pressure. Increase of long side roughness will enhance heat transfer in the same roughness of short side and the gap of the heat transfer coefficient and the amplitude ratio of the adjacent rock samples in different direction roughness are different. Roughness value of fracture surface has a great effect on the heat transfer. Furthermore，the directionality of roughness changes the heat transfer intensity by controlling the seepage path and effective heat transfer area，which shows that value and anisotropy of roughness are not negligible factor in the study of rock heat transfer.

Key words： rock mechanics joint roughness coefficient artificial rock samples single fracture multi-level flow rates convective heat transfer coefficient

引用本文:

黄奕斌1，张延军1，2，于子望1，马跃强1，张驰1，李良振1. 考虑多级流速下的岩石粗糙单裂隙渗流传热特性试验研究[J]. 岩石力学与工程学报, 2019, 38(S1): 2654-2667.
HUANG Yibin1，ZHANG Yanjun1，2，YU Ziwang1，MA Yueqiang1，ZHANG Chi1，LI Liangzhen1. Experimental study of convection heat transfer characteristics in single rough rock fracture considering multi-level flow rates. , 2019, 38(S1): 2654-2667.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2017.1405 或 http://rockmech.whrsm.ac.cn/CN/Y2019/V38/IS1/2654

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