The Research On Hydraulic Characteristics Of Migration Of Pipe Carriage Under Different Diameter Ratios

With the acceleration of economic globalization, the rapid development of science and technology, modern logistics industry has played an increasingly important role in the rapid economic development. The traditional logistics and distribution methods, including aviation, waterways, road and rail have been very difficult to meet the current needs of economic development, and the new mode of transport logistics urgently need arise.As a new pipeline hydraulic transportation technology, the transportation of tube-contained raw material ("TRM"for short) by hydraulic pipe, based on summing up of the past strengths and weaknesses of various pipeline hydraulic transportation methods, has adventanges of clean, environmentally friendly, efficient, low-power . This means of transportation is different from the traditional slurry pipeline hydraulic transportation,common material flat and direct current pipeline hydraulic transportation and is an extremely promising transportation technology. So,the experimental and theoretical studies carried out at present is of great significance to its industrial application on the future.The dissertation was supported by National Natural Science Fundation"The Research on Hydraulic Characteristics Transported by Tube Charging Pipes"(50579044).The technical route in this paper is to combine theoretical studies with model test. The experimental researches on hydraulic characteristics of migration of pipeline character under different diameter ratios. The main contents and results are as follows:1. To get the relationship between the average speed of vehicle and the diameter ratio by analyzing test dataUnder the same load,length of the vehicle,Reynolds number,the average speed of the pipe vehicle increased along with the increase of the diameter ratio,almost linear relationship;2. Under the same load,length of the vehicle,Reynolds number,the average velocity of water flow within the annular gap between the pipe wall and the wall of vehicle firstly increased along with the increase of the diameter ratio, then decreased , but there is always a maximum when the diameter ratio equal to 0.6;3. On the whole, under the same load,length of the vehicle,Reynolds number,diameter ratio didn't change the overall trends of the overall pressure distribution along the pipeline basically. The trend of the pressure distribution along pipeline was the same basically,when the vehicle was running in the pipeline at various times.4. Under the same load,length of the vehicle,Reynolds number, as the diameter ratio changes, the trend of pressure distribution at local test pipeline at various times was consistent.5. The pressure distribution law of the test pipeline at various times around a specific sectionWhen there was only clean water in the pipeline, the pressure at local pipeline declined along the way;when the vehicle began to move, there was a slight increase of the pressure in the vicinity of that section, compared with when there was only clean water in the pipeline; When the vehicle arrived at that cross-section,pressure in the vicinity increased as well, but at the section office, the pressure decreased, the decrease firstly increased and then decreased along with the increase of the diameter ratio,the maximum appears when the diameter ratio equal to 0.6; When the vehicle was about to pass out the pipe ,the pressure near that cross-section increased further again, compared with when the vehicle began to move.6. Under the same load,length of the vehicle,Reynolds number,whether the vehicle was running at the beginning, the middle time, the end of time or the average time, the value of total energy consumption of the pipe flow varied with the diameter ratio, roughly the same trends. Namely, the consumption value firstly decreased along with the increase of the diameter ratio, then increased when the diameter ratio increased to 0.6 .7. In certain assumptions, simple mathematical model has been established when the vehicle was running smoothly in straight pipeline and been solved, obtaining the expression of both average speed of the pipe vehicle and pressure drop before and after the vehicle body regard to the average velocity of the pipe flow .8. Through simulation,using CFD software Flow-3D,get both the pressure and flow's velocity field distribution at local pipeline sections when the the vehicle was running smoothly in straight pipeline.These conclusions had an important practical significance to the further research of hydraulic pipe transport and provided a certain amount of technical reference to the industrialization of this technology early.