本文選題：干熱巖 + 單裂隙��； 參考：《吉林大學(xué)》2017年碩士論文

【摘要】：近年來對能源和環(huán)境質(zhì)量要求越來越高,干熱巖由于有巨大的資源儲量和清潔性,越來越受到重視。干熱巖型地?zé)崮芴崛⊥ǔＴ诹严吨信c地?zé)釒r體發(fā)生熱交換來提取,因此研究裂隙的滲流換熱機(jī)理對干熱巖工程具有重要意義。本文采用3D打印技術(shù)制備各種粗糙裂隙,利用實(shí)驗(yàn)、數(shù)值模擬和量化評價(jià)的方法對單裂隙粗糙巖體的滲流傳熱影響因素和傳熱機(jī)理進(jìn)行探討。對不同粗糙類型巖樣分別進(jìn)行了滲流實(shí)驗(yàn)和滲流換熱實(shí)驗(yàn),分析各粗糙裂隙面的滲流換熱特征;采用基于平板層流換熱理論數(shù)值軟件模擬進(jìn)行理論對比;采用全局靈敏度法定量分析,主要結(jié)論如下:首先,采用3D打印方法依據(jù)巴頓標(biāo)準(zhǔn)粗糙曲線制備了22塊滲流方向和垂直滲流方向粗糙裂隙面巖樣,在此基礎(chǔ)上開展了滲流實(shí)驗(yàn),實(shí)驗(yàn)結(jié)果顯示,隨著粗糙度的增加,裂隙流量和等效水力開度均降低;在降低流體流量方面,垂直滲流方向粗糙度作用最小,二維粗糙裂隙作用最大,二維裂隙面中粗糙度高的裂隙面比粗糙度低的裂隙面作用大,滲流方向粗糙度比垂直滲流方向粗糙度作用大。其次,依據(jù)巴頓標(biāo)準(zhǔn)粗糙曲線制備的22塊滲流方向和垂直滲流方向粗糙裂隙面巖樣,開展了滲流換熱實(shí)驗(yàn),實(shí)驗(yàn)結(jié)果顯示,各種粗糙裂隙面巖樣的對流換熱系數(shù)隨著流量的升高提高越大,隨著裂隙面溫度的升高對流換熱系數(shù)逐漸增大;垂直滲流方向粗糙度對提高對流換熱系數(shù)的作用最小,二維粗糙裂隙對提高對流換熱系數(shù)的影響作用相對較大;滲流方向粗糙裂隙和垂直滲流方向粗糙裂隙滲流傳熱機(jī)理較為相似,主要是受換熱面積和局部紊流影響,二維粗糙裂隙滲流換熱機(jī)理增加了滲流優(yōu)勢路徑的影響;對22種粗糙裂隙面擬合了Nu與Re和Pr的曲線,給出了相應(yīng)的特征數(shù)方程。再次,通過單裂隙巖體滲流傳熱數(shù)值模擬進(jìn)行了理論對比,平直裂隙、滲流方向不同粗糙度裂隙和垂直滲流方向不同粗糙度裂隙巖樣的數(shù)值模擬和實(shí)驗(yàn)結(jié)果誤差較小,采用層流換熱理論可以近似計(jì)算;二維粗糙裂隙巖樣的對比誤差較大,不適合采用層流換熱理論近似計(jì)算。最后,采用全局靈敏度評價(jià)方法評價(jià)滲流換熱實(shí)驗(yàn)中各實(shí)驗(yàn)變量的影響作用。在各類粗糙裂隙面滲流換熱實(shí)驗(yàn)中,巖石溫度對出水口溫度的提高起主要作用;粗糙度在滲流方向粗糙裂隙面中作用比垂直滲流方向粗糙裂隙面作用大;在二維粗糙裂隙面實(shí)驗(yàn)中,1號裂隙面粗糙度大于2號裂隙面,但是1號裂隙面流量對換熱的作用低于2號裂隙面;平直裂隙和一維粗糙裂隙數(shù)值模擬評價(jià)與滲流換熱實(shí)驗(yàn)評價(jià)接近;二維裂隙面數(shù)值模擬評價(jià)與滲流換熱實(shí)驗(yàn)評價(jià)差距較大。
[Abstract]:In recent years, the requirements of energy and environmental quality are more and more high, and the dry hot rock has been paid more and more attention because of its huge resource reserves and cleanliness. The extraction of geothermal energy of dry-hot rock type usually takes place in fissure and geothermal rock mass to get heat exchange, so it is very important to study the mechanism of seepage heat transfer of fracture in dry-hot rock engineering. In this paper, 3D printing technique is used to fabricate various rough fractures. By means of experiments, numerical simulation and quantitative evaluation, the factors affecting the seepage heat transfer and the heat transfer mechanism of single fissure rough rock mass are discussed. The seepage experiments and heat transfer experiments on different types of rock samples were carried out to analyze the seepage heat transfer characteristics of each rough fracture surface, and the theoretical comparison was carried out by using the numerical simulation software based on laminar heat transfer theory of flat plate. The main conclusions are as follows: firstly, 22 rock samples with percolation direction and perpendicular percolation direction have been prepared by 3D printing method according to Barton standard rough curve, and seepage experiments have been carried out on the basis of the global sensitivity method. The experimental results show that with the increase of roughness, the fracture flow rate and equivalent hydraulic opening decrease, the vertical percolation direction roughness is the least, and the two-dimensional coarse fracture effect is the greatest. The roughness of the surface with high roughness is greater than that of the surface with low roughness, and the roughness of percolation direction is greater than that of the direction of perpendicular percolation. Secondly, according to 22 rock samples of percolation direction and perpendicular percolation direction prepared by Barton standard rough curve, the seepage heat transfer experiment is carried out. The experimental results show that, The convection heat transfer coefficient of rock samples of various rough fracture surfaces increases with the increase of flow rate and gradually increases with the increase of fracture surface temperature, and the effect of perpendicular percolation direction roughness on the increase of convection heat transfer coefficient is the least. The effect of two-dimensional rough fissure on the increase of convection heat transfer coefficient is relatively large, and the seepage heat transfer mechanism of rough fissure in percolation direction is similar to that in perpendicular direction, which is mainly affected by heat transfer area and local turbulence. The heat transfer mechanism of two-dimensional rough fracture seepage increases the influence of percolation dominant path, and the curves of Nu, re and pr are fitted for 22 kinds of rough fracture surfaces, and the corresponding characteristic number equations are given. Thirdly, through the numerical simulation of seepage heat transfer in single fractured rock mass, the numerical simulation and experimental results of straight fracture, different roughness fissure in percolation direction and different roughness fissure in vertical percolation direction are compared. The laminar heat transfer theory can be used to approximate the calculation, and the contrast error of two-dimensional rough fissure rock samples is large, so it is not suitable to use laminar flow heat transfer theory to approximate calculation. Finally, the global sensitivity evaluation method is used to evaluate the influence of various experimental variables in the seepage heat transfer experiment. In the experiments of seepage heat transfer of various rough fracture surfaces, rock temperature plays a major role in the increase of outlet temperature, and roughness plays a more important role in the percolation direction of rough fracture surface than in the vertical direction of percolation direction. In the experiment of two-dimensional rough fracture surface, the roughness of No. 1 fissure surface is greater than that of No. 2 fissure surface, but the heat transfer effect of No. 1 fissure surface is lower than that of No. 2 fissure surface. The numerical simulation of straight fractures and one-dimensional rough fractures is close to the experimental evaluation of seepage heat transfer, and the gap between the numerical simulation of two-dimensional fracture surface and the experimental evaluation of seepage heat transfer is large.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU45

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