海底管道颗粒侵蚀数值模拟技术及考察

发布时间：2018-04-04 16:29

本文选题：流动保障　切入点：颗粒侵蚀　出处：《天津大学》2014年硕士论文

【摘要】：随着深海油气开采技术的不断发展，其输运过程中管道的流动安全性必须得到保障。海底管道中颗粒侵蚀是油气输送过程需面临的一个重要问题，也是流动保障的一个重要分支。目前国内外针对颗粒侵蚀机理已开展了大量研究工作，计算流体动力学模型的发展极大加速了颗粒侵蚀的研究进程，该模型充分考虑了管道内复杂流场和颗粒运动轨迹，使其相对于经验模型和半经验模型具有无可比拟的优越性。该模型求解侵蚀分为三个步骤：流场模拟，跟踪颗粒轨迹，求解侵蚀损伤。本文首先基于上述步骤验证了CFD侵蚀预测数值方法的有效性，建立了一套可行的侵蚀预测数值方法。之后使用该数值方法阐述了CFD求解管道颗粒侵蚀的一般流程。通过对不同实验工况弯头及T型堵头管的颗粒侵蚀进行模拟，证实了各典型侵蚀公式的精度及适用性，验证了上述数值方法的可靠性，获得了求解管道颗粒侵蚀可行的数值技术，对工程实践提供了重要的技术参考。基于上述数值技术，首先使用剪切压力传输模型计算管道内流场，使用拉格朗日方法跟踪颗粒运动轨迹，结合颗粒随机反弹模型，建立跟踪复杂流场中大规模颗粒运动轨迹的一般方法；之后通过二次开发将四种颗粒侵蚀公式对应的Fortran子程序引入ANSYS CFX，预测弯头、T型堵头管的砂粒侵蚀结果，并结合相应实验数据，比较分析各侵蚀公式的精度与适用性。分析结果表明，对于弯头，四种侵蚀公式的数值结果与实验结果均吻合良好，其中Tabakoff的侵蚀公式具有较高的精度和较好的适用范围；对于T型堵头管，数值方法对颗粒运动机理的模拟尚存缺陷，需做进一步改进。
[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.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P756.2

【相似文献】