| In recent years, with the rapid development of science and technology, urban traffic congestion, environmental pollution caused by the traditional transportation mode and energy shortage gradually become a hot issue which perplexes the sustainable development of society. Along with the concept of environmental protection win public feeling deeply, therefore, it is inevitab to explore the mode of material transportation which is clean, low carbon, energy saving, environmental protection, which has become the mainstream of social development and inexorable trend. Tube-Contained raw material pipeline hydraulic transportation is a new way of material transportation which is accordant with green environmental protection concepts.Tube-Contained raw material pipeline hydraulic transportation is on the base of the principle of hydraulics and regards water as the vehicle, sealing materials with the cylinders for long distance transportation pipeline, which overcomes a lot of drawbacks of traditional transportation mode with the characteristics of no pollution, low energy consumption. It could improve and supplement the existing transport system.In order to further perfect the technology of Tube-Contained raw material pipeline hydraulic transportation, this paper is combined with National Nature Science Foundation of China, including "Research on Hydraulic Characteristics of Pipe Gap Spiral Flow (51109155)" and "Research on Energy Consumption of Piped Carriages Train (51179116)".3-D hydraulic characteristics of moving tube-contained raw material piped carriage at horizontal pipeline is research by theoretical analysis,model experiment and numerical simulation. The main research contents and results are as followed:Firstly, the mathematical model of moving piped carriage at horizontal pipeline is built by processing software Gambit, the Simple algorithm is applied to solve mathematical model. Research technique of numerical simulation mainly adopts the 6 dof dynamic grid model and combine with the relevant attribute array of 6 dof, parameters of moment of inertia of the cylinder and the migration resistance to compile calculating program of dynamic grid of moving piped carriages at horizontal pipeline, to further realize the liquid-solid two phase coupling movement of the piped carriages in the inner pipe.Secondly, axial velocity distribution of upstream and downstream section of piped carriages presents with the smaller value at the middle area of pipeline and the larger ones toward the inner wall of pipeline. From the inner pipe wall to the center of the pipe, radial velocity shows a trend of first increased and then decreased. Location of tangential velocity concentrates on the district of stand bar symmetrically. Annular gap flow from the inner pipe wall to the center of the pipe shows a trend of first increased and then decreased. Velocity distribution of the front, the middle and the end of piped carriage is consistent with each other. The results of numerical simulation is consistent with experimental results basically, maximum error is 6.7%.Thirdly, when the piped carriages is in constant motion, the piezometer head along the pipeline displayed gradual the trend of decrease. Local piezometer head caused by the annular gap area falls sharply, from the front section of piped carriage to the end, the piezometer head first increases then decreases. Piezometer head is a sudden change in the local area via the test section. The closer to the downstream the section of selection is, the lower the piezometer head of objective section becomes at the same time; the piezometer head of same section which is located behind piped carriage below that which is in front of piped carriage.Fourthly, pressure distribution of the downstream section of piped carriages presents with the smaller value at the middle area of pipeline and the larger ones toward the inner wall of pipeline. There is more pressure in the center of the pipe and there is less pressure near the pipe wall in the upstream section of piped carriages.when the piped carriages is in constant motion, pressure of annular gap flow field decreases gradually from outer wall of piped carriage to inner wall of pipeline at the front of piped carriage, that is basically unchanged at the middle section of piped carriage, pressure gradually increases at the end of piped carriage.Fifthly, with the increase of diameter of the piped carriages, the axial velocity of same measure points which range from the center of the circular tube section of the piped carriages in the downstream and upstream to the edge position of the piped carriages decreases gradually, on the contrary, the axial velocity of same measure points which range from the edge position of the piped carriages to the the outside of the pipe wall increased gradually. Radial velocity and circumferential velocity of same measure points which range from the center of the circular tube section of the piped carriages in the downstream and upstream to the edge position of the piped carriages diminish gradually. The pressure of same measure points of piped carriages in the downstresm section of piped carriages gradually decreases, Pressure of measure points in the upstream section of piped carriages increases gradually.Sixthly, under the operating condition of migration of the piped carriages, the pressure of annular gap flow along the pipeline presents firstly decreases and then increases. The axial velocity of annular gap flow displays a trend of firstly increasing and then decreasing.In this paper, this is of great importance for the further research of hydraulic characteristics of flow field under the dynamic boundary condition, at the same time, it is of great significance for exploring motion dynamics mechanism of piped carriage. |
