本文關鍵詞： 多孔介質(zhì) 污染物遷移 多相流 阻力系數(shù)　出處：《東北石油大學》2015年碩士論文　論文類型：學位論文

【摘要】：土壤作為一種常見的多孔介質(zhì),既承擔著地下輸油管道泄漏污染物的侵襲,又作為污染物的傳遞載體,易造成更為嚴重的二次污染。本文以土壤類多孔介質(zhì)內(nèi)污染物遷移特性為基礎,通過理論和數(shù)值模擬研究地下輸油管道泄漏污染物在多孔介質(zhì)中的遷移規(guī)律,為地下輸油管道泄漏檢測技術提供更深入的理論基礎,為污染土壤修復技術的工程應用提供參考依據(jù)。通過模擬流體在多孔介質(zhì)區(qū)域內(nèi)流動情況,分析土壤多孔介質(zhì)變形場的作用影響;通過進行多孔介質(zhì)阻力系數(shù)試驗測定,分別討論了多孔介質(zhì)顆粒形狀與粒徑對阻力系數(shù)影響情況;通過對管道泄漏污染物在土壤中遷移的一維、多維模型建立及分析,討論了管道泄漏石油污染物有源連續(xù)注入一維、多維遷移特點;并基于格子Boltzmann理論方法,采用Chapman-Enskog展開和多尺度技術,建立了求解管道泄漏污染物瞬時、連續(xù)注入一維方程的D1Q3模型,對管道泄漏污染物在土壤中瞬時、連續(xù)注入一維模型進行LBM(Lattice Boltzmann Method)模擬計算分析。分析結(jié)果表明:流體在錯排粒子的排列區(qū)域內(nèi)流動時獲得較大的運動阻力;通過粒徑較小、顆粒相對表面積較大的多孔介質(zhì)時,受到較大的阻力作用;入口速度較小的流體產(chǎn)生相對較小的壓力降。單相水在通過由0.8-0.9mm粒徑組成的多孔介質(zhì)區(qū)域時,受到的粘性阻力作用大于通過混合粒徑所產(chǎn)生的粘性阻力作用,受到的慣性阻力作用小于通過混合粒徑所產(chǎn)生的慣性阻力作用。水-白油32#混合液體在通過由粒徑0.8-0.9mm組成的多孔介質(zhì)區(qū)域時,受到的粘性阻力作用小于通過混合粒徑所產(chǎn)生的粘性阻力作用,受到的慣性阻力作用小于通過混合粒徑所產(chǎn)生的慣性阻力作用。當粒徑條件相同時,單相水受到的粘性阻力作用較大,受到的慣性阻力作用較小。水-白油32#-空氣多相流動時,白油32#繞過管道遷移至上方區(qū)域,泄漏口下方區(qū)域白油32#體積分數(shù)逐漸增大。不同時刻下,地下輸油管道泄漏污染物瞬時、連續(xù)注入一維模型的LBM數(shù)值解與解析解的吻合度良好,為研究管道泄漏石油污染物的遷移問題提供了理論依據(jù)。
[Abstract]:Soil is a kind of porous medium, not only bear the underground pipeline leak pollution and invasion, used as a carrier of pollutants, causing more serious two pollution. Based on the characteristics of soil types of pollutant migration in porous media, through theoretical and numerical study of underground pipeline leakage of pollutants in the simulated migration in porous media, and provide a theoretical basis for further underground pipeline leak detection technology, to provide reference for engineering application of soil remediation technology. The flow in the porous media region through the simulation of fluid analysis, effects of soil deformation of porous media field; the resistance coefficient of porous medium test, porous media the particle shape and particle size on the impact resistance coefficient were discussed; through one-dimensional migration in soil on pipeline leakage of pollutants, Establishment and analysis of multidimensional model, discusses the pipeline leakage of oil pollutants active continuous injection of one-dimensional, multi-dimensional transfer characteristics; and based on the theory of lattice Boltzmann method, using Chapman-Enskog expansion and multi-scale technique, is established for pipeline leakage of pollutants instantaneous, continuous D1Q3 model into one-dimensional equations, the pipeline leak pollutants instantaneous in the soil, LBM one dimensional model of continuous injection (Lattice Boltzmann Method) simulation analysis. The analysis results show that the obtained motion greater resistance to flow arrangement region of particles within the fluid in the wrong row; the smaller particle size, particle relative surface area of porous medium large, under the action of greater resistance; fluid entrance velocity is smaller than the yields relatively small the pressure drop in the water through the porous media. The single-phase region by 0.8-0.9mm particle size composition, viscous resistance for more than by mixing by Effect of particle size of viscous resistance produced by the inertia role is less than the inertia effect of mixed particle size produced by water - oil. 32# mixed liquid in porous media by region with the grain size of 0.8-0.9mm composition, viscous drag by less than by viscous drag mixed particles generated by inertia the resistance is less than that by inertia effect of mixed particle size generated. When the particle size under the same conditions, the viscous resistance effect of single-phase water is larger, smaller inertia effect by water. - white 32#- air multiphase flow, oil migration to the area above 32# bypass pipeline, the leakage area below the white 32# the volume fraction increases gradually. At different times, the underground pipeline leak pollutants instantaneous, continuous injection of LBM one dimensional numerical solution and analytical solution of the model is in good agreement, for the study of pipeline leakage It provides a theoretical basis for the migration of leaking oil pollutants.

【學位授予單位】：東北石油大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：X74;X53

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本文編號：1442229