平直管段下不同直径管道车运移时的缝隙流流速特性研究
发布时间：2018-10-09 17:46
【摘要】：近年来,交通运输工具的广泛应用对支持全球的经济发展起到了巨大作用,然而传统的运输方式的多采用高碳能源,来自运输过程中的碳排放对环境的影响已不容忽视。随着人们对于低碳环保的呼声越来越高,发展新型低碳输送模式对于构建绿色物流体系起到了举足轻重的地位。 筒装料管道水力输送的是近年来新兴的管道水力输送技术,它克服了许多传统管道水力输送模式的弊端,同时还兼具了输送过程中无污染、低能耗等优点,非常符合当代物流运输的节能环保要求,所以筒装料水力输送技术具有广阔的发展前景和很高的应用价值。 为了进一步丰富筒装料管道水力输送的研究内容,同时完善缝隙流的相关理论,本文结合国家自然科学基金“管道缝隙螺旋流水力特性研究(51109115)”和“管道列车水力输送能耗研究(51179116)”,以管道车在平直管段下的受力情况和缝隙流的流速分布特性为研究对象,依据理论分析、试验研究和数值模拟相结合的技术路线,对选择较优车径提供了三种方法,通过研究得到了以下成果： (1)分析得到了不同直径管道车的初始压差力及影响因素,进一步完善了关于管道车的初始起动条件的研究； (2)提出了基于输送效率选择较优车径的标准,即在一定的输送总量、输送距离和管道车长度的条件下能够以较小能耗达到较快的输送速度时所对应的管道车车径为较优车径； (3)从管道车容重比的角度出发,提出了选择较优车径的第一个方法(容重比法),即当管道车整体与输送流体之间的容重比最接近于1时,可认为该车型的直径达到了较优车径； (4)根据管道车速度、管道水流平均流速和缝隙流平均流速三者的关系,提出了确定较优车径的第二种方法(平均流速法),即在稳定运行的条件下,当三者速度最为接近时所对应的管道车车径为较优车径； (5)依据试验对管道车在稳定运移状态下所产生的缝隙流的流速分布规律的,提出了选择较优车径的第三种方法(流速分布法),当管道车稳定运移时其缝隙流流速分布情况最接近于清水管道流速分布时,该管道车的车径即为较优车径； (6)利用FLUENT软件,对不同直径管道车在平直管段稳定运移状态下的局部流速场进行了数值模拟,并和试验数据数据进行对比验证。本文将缝隙流研究与管道车运移特性相结合,补充了关于研究管道车运移特性的又一领域。
[Abstract]:In recent years, the wide application of transportation tools has played a great role in supporting the global economic development. However, the traditional transportation mode mostly uses high-carbon energy, and the impact of carbon emissions from the transportation process on the environment can not be ignored. With the increasing demand for low-carbon environmental protection, the development of a new low-carbon transport mode plays an important role in the construction of green logistics system. In recent years, the pipeline hydraulic conveying technology of barrel loading pipeline overcomes the disadvantages of many traditional pipeline hydraulic transportation modes, and also has the advantages of no pollution and low energy consumption in the course of transportation. It meets the requirements of energy saving and environmental protection of modern logistics transportation, so the hydraulic conveying technology of cylinder loading has broad development prospect and high application value. In order to further enrich the research content of hydraulic conveying in cylinder charging pipeline, and improve the relevant theory of slot flow at the same time, Combined with the National Natural Science Foundation of China "Research on the characteristics of Spiral flow Force in Pipeline slot (51109115)" and "study on Energy consumption of Pipeline Train hydraulic Transportation" (51179116), the research object of this paper is the stress situation of pipeline car under the flat pipe section and the velocity distribution characteristics of the slot flow. On the basis of theoretical analysis, experimental research and numerical simulation, three methods are provided for selecting better vehicle diameter. The main results are as follows: (1) the initial pressure difference force and its influencing factors of pipeline car with different diameters are analyzed, and the initial starting conditions of pipeline car are further improved; (2) the criterion of selecting better vehicle diameter based on transportation efficiency is put forward, that is, at a certain transportation amount, Under the condition of transportation distance and length of pipeline vehicle, the corresponding diameter of pipeline car can be better when the energy consumption is lower and the conveying speed is faster. (3) starting from the angle of volume weight ratio of pipeline car, The first method (bulk weight ratio method) for selecting better vehicle diameter is put forward, that is, when the bulk weight ratio between the whole pipeline car and the conveying fluid is closest to 1, the diameter of the vehicle can be considered to be the optimum diameter; (4) according to the speed of the pipeline car, The relationship between the average flow velocity of pipeline and the average velocity of crevice flow is discussed. The second method (average velocity method) for determining the optimum vehicle diameter is put forward, that is, under the condition of steady operation, (5) according to the experimental results, the velocity distribution of the slot flow produced by the pipeline vehicle under the condition of steady migration is studied. The third method (velocity distribution method) is proposed to select the optimal vehicle diameter. When the flow velocity distribution of the slot flow is the closest to the flow velocity distribution in the clear water pipeline, the diameter of the pipeline car is the better one. (6) using FLUENT software, the local velocity field of pipeline vehicles with different diameters is simulated under the steady migration condition in the straight section, and the results are compared with the experimental data. In this paper, the research of slot flow is combined with the characteristics of pipeline vehicle movement, which complements another field of research on the characteristics of pipeline vehicle movement.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U171
本文编号：2260205
[Abstract]:In recent years, the wide application of transportation tools has played a great role in supporting the global economic development. However, the traditional transportation mode mostly uses high-carbon energy, and the impact of carbon emissions from the transportation process on the environment can not be ignored. With the increasing demand for low-carbon environmental protection, the development of a new low-carbon transport mode plays an important role in the construction of green logistics system. In recent years, the pipeline hydraulic conveying technology of barrel loading pipeline overcomes the disadvantages of many traditional pipeline hydraulic transportation modes, and also has the advantages of no pollution and low energy consumption in the course of transportation. It meets the requirements of energy saving and environmental protection of modern logistics transportation, so the hydraulic conveying technology of cylinder loading has broad development prospect and high application value. In order to further enrich the research content of hydraulic conveying in cylinder charging pipeline, and improve the relevant theory of slot flow at the same time, Combined with the National Natural Science Foundation of China "Research on the characteristics of Spiral flow Force in Pipeline slot (51109115)" and "study on Energy consumption of Pipeline Train hydraulic Transportation" (51179116), the research object of this paper is the stress situation of pipeline car under the flat pipe section and the velocity distribution characteristics of the slot flow. On the basis of theoretical analysis, experimental research and numerical simulation, three methods are provided for selecting better vehicle diameter. The main results are as follows: (1) the initial pressure difference force and its influencing factors of pipeline car with different diameters are analyzed, and the initial starting conditions of pipeline car are further improved; (2) the criterion of selecting better vehicle diameter based on transportation efficiency is put forward, that is, at a certain transportation amount, Under the condition of transportation distance and length of pipeline vehicle, the corresponding diameter of pipeline car can be better when the energy consumption is lower and the conveying speed is faster. (3) starting from the angle of volume weight ratio of pipeline car, The first method (bulk weight ratio method) for selecting better vehicle diameter is put forward, that is, when the bulk weight ratio between the whole pipeline car and the conveying fluid is closest to 1, the diameter of the vehicle can be considered to be the optimum diameter; (4) according to the speed of the pipeline car, The relationship between the average flow velocity of pipeline and the average velocity of crevice flow is discussed. The second method (average velocity method) for determining the optimum vehicle diameter is put forward, that is, under the condition of steady operation, (5) according to the experimental results, the velocity distribution of the slot flow produced by the pipeline vehicle under the condition of steady migration is studied. The third method (velocity distribution method) is proposed to select the optimal vehicle diameter. When the flow velocity distribution of the slot flow is the closest to the flow velocity distribution in the clear water pipeline, the diameter of the pipeline car is the better one. (6) using FLUENT software, the local velocity field of pipeline vehicles with different diameters is simulated under the steady migration condition in the straight section, and the results are compared with the experimental data. In this paper, the research of slot flow is combined with the characteristics of pipeline vehicle movement, which complements another field of research on the characteristics of pipeline vehicle movement.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U171
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