本文選題：流動(dòng)保障　切入點(diǎn)：顆粒侵蝕　出處：《天津大學(xué)》2014年碩士論文

【摘要】：隨著深海油氣開采技術(shù)的不斷發(fā)展，其輸運(yùn)過(guò)程中管道的流動(dòng)安全性必須得到保障。海底管道中顆粒侵蝕是油氣輸送過(guò)程需面臨的一個(gè)重要問(wèn)題，也是流動(dòng)保障的一個(gè)重要分支。目前國(guó)內(nèi)外針對(duì)顆粒侵蝕機(jī)理已開展了大量研究工作，計(jì)算流體動(dòng)力學(xué)模型的發(fā)展極大加速了顆粒侵蝕的研究進(jìn)程，該模型充分考慮了管道內(nèi)復(fù)雜流場(chǎng)和顆粒運(yùn)動(dòng)軌跡，使其相對(duì)于經(jīng)驗(yàn)?zāi)Ｐ秃桶虢?jīng)驗(yàn)?zāi)Ｐ途哂袩o(wú)可比擬的優(yōu)越性。 該模型求解侵蝕分為三個(gè)步驟：流場(chǎng)模擬，跟蹤顆粒軌跡，求解侵蝕損傷。本文首先基于上述步驟驗(yàn)證了CFD侵蝕預(yù)測(cè)數(shù)值方法的有效性，建立了一套可行的侵蝕預(yù)測(cè)數(shù)值方法。之后使用該數(shù)值方法闡述了CFD求解管道顆粒侵蝕的一般流程。通過(guò)對(duì)不同實(shí)驗(yàn)工況彎頭及T型堵頭管的顆粒侵蝕進(jìn)行模擬，證實(shí)了各典型侵蝕公式的精度及適用性，驗(yàn)證了上述數(shù)值方法的可靠性，獲得了求解管道顆粒侵蝕可行的數(shù)值技術(shù)，對(duì)工程實(shí)踐提供了重要的技術(shù)參考。 基于上述數(shù)值技術(shù)，首先使用剪切壓力傳輸模型計(jì)算管道內(nèi)流場(chǎng)，使用拉格朗日方法跟蹤顆粒運(yùn)動(dòng)軌跡，結(jié)合顆粒隨機(jī)反彈模型，建立跟蹤復(fù)雜流場(chǎng)中大規(guī)模顆粒運(yùn)動(dòng)軌跡的一般方法；之后通過(guò)二次開發(fā)將四種顆粒侵蝕公式對(duì)應(yīng)的Fortran子程序引入ANSYS CFX，預(yù)測(cè)彎頭、T型堵頭管的砂粒侵蝕結(jié)果，并結(jié)合相應(yīng)實(shí)驗(yàn)數(shù)據(jù)，比較分析各侵蝕公式的精度與適用性。分析結(jié)果表明，對(duì)于彎頭，四種侵蝕公式的數(shù)值結(jié)果與實(shí)驗(yàn)結(jié)果均吻合良好，其中Tabakoff的侵蝕公式具有較高的精度和較好的適用范圍；對(duì)于T型堵頭管，數(shù)值方法對(duì)顆粒運(yùn)動(dòng)機(jī)理的模擬尚存缺陷，需做進(jìn)一步改進(jìn)。
[Abstract]:With the development of deep-sea oil and gas exploitation technology, the safety of pipeline flow must be guaranteed.Particle erosion in submarine pipelines is an important problem in the process of oil and gas transportation, and it is also an important branch of flow protection.At present, a lot of research work has been done on particle erosion mechanism at home and abroad. The development of computational fluid dynamics (CFD) model has greatly accelerated the research process of particle erosion. The model fully takes into account the complex flow field and particle motion trajectory in pipeline.Compared with the empirical model and the semi-empirical model, it has incomparable advantages.The model can be divided into three steps: flow field simulation, particle trajectory tracking and erosion damage solving.In this paper, based on the above steps, the validity of CFD erosion prediction numerical method is verified, and a set of feasible erosion prediction numerical method is established.Then the general process of solving pipe particle erosion by CFD is described by using the numerical method.By simulating the particle erosion of elbow and T-type plug pipe under different experimental conditions, the accuracy and applicability of each typical erosion formula are verified, and the reliability of the above numerical method is verified.A feasible numerical technique for solving pipe particle erosion is obtained, which provides an important technical reference for engineering practice.Based on the above numerical technique, the shear pressure transfer model is used to calculate the flow field in the pipeline, and the Lagrangian method is used to track the particle trajectory.A general method for tracking the trajectory of large scale particles in complex flow field is established, and then the Fortran subroutine corresponding to four particle erosion formulas is introduced into ANSYS CFX to predict the sand erosion results of the curved T-type plugging pipe.Combined with the corresponding experimental data, the accuracy and applicability of each erosion formula are compared and analyzed.The results show that the numerical results of the four erosion formulas are in good agreement with the experimental results for the elbow, and the Tabakoff's erosion formula has a higher accuracy and a better range of application, while for the T-type plug pipe, the numerical results are in good agreement with the experimental results.The simulation of particle motion mechanism by numerical method needs further improvement.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：P756.2

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本文編號(hào)：1710754