不同导流条长度管道车运移时的缝隙螺旋流流速特性研究
[Abstract]:Hydraulic transportation of barrel-filling pipeline is an environmental-friendly, energy-saving, high-efficient and safe way of transportation. This transportation mode accords with the concept of sustainable development in our country and is a new type of pipeline hydraulic transportation method of saving energy and environmental protection. This transportation method is different from the traditional hydraulic transportation method of slurry pipeline and shaped material pipeline. It is a kind of science and technology with great prospect of research and development in the new era and has a very broad prospect of application and development. In this paper, the research on the energy consumption of pipeline train hydraulic transportation (51179116), the characteristics of helical flow force of pipeline gap (51109155) and the natural science fund project of Shanxi Province (2015011067) are combined with the National Natural Fund project "Research on Energy consumption of Pipeline Trains" (51179116). Through the combination of experiment and numerical simulation, the flow velocity characteristics of the slot helical flow produced by the pipeline vehicle with different diversion strip lengths are studied. The conclusions are as follows: (1) when the length of the guide strip is a unique variable, The moving speed of pipeline car in the pipeline increases with the increase of the length of the guide strip. When the vehicle type of pipeline vehicle is the only variable, the speed of pipeline vehicle moving from large to small is L 脳 DX 150 脳 70mm pipeline vehicle, L 脳 D0 100 脳 70mm pipeline car, L 脳 DX 150 脳 60mm pipeline car. It can be seen that the influence of pipeline car diameter on the moving speed is greater than the length of pipeline car. (2) when the pipeline car with different length of diversion strip moves in the straight section, The velocity distribution of the flow in the gap is slightly different in the section near the vehicle end of the pipeline, mainly because the vortex region formed by the velocity of velocity is more and the velocity gradient becomes larger. For the same pipe-car, the 3-D velocity distribution law of helical flow along the body direction is from instability to stability, and then to instability. The axial velocity distribution of the slot helical flow is relatively stable relative to its radial and circumferential velocity distribution, and the axial velocity is much larger than the radial and circumferential velocity of the slot flow. The increase of the length of the guide strip will affect the direction of the radial flow in the slot. The longer the strip, the more the flow direction deviates from the center of the pipe. With the increase of the length of the guide strip of the same type, the flow velocity of each section in the slot basically increases. (3) taking section 3 of the car as the research section, When there is no guide strip near the polar axis, the axial velocity of the slot helical flow reaches the maximum value at the point of 44mm from the center of the pipe, and when there is a guide strip near the polar axis, the trend of the axial velocity of the flow on the axis changes obviously. The farther away from the center of the pipeline, the greater the axial velocity is. (4) the axial velocity of the polar axis of the test section in the gap is similar to that of the body under the same conditions. Along the body from the rear section to the front section of the car showed a trend of "M" glyph, which increased first, then decreased and then decreased. However, the radial and circumferential velocity of the helical flow in the crevice is higher than that in the test section. At the four sections (the section in the middle of the vehicle and the middle section in the front of the vehicle), a large number of values appear. (5) by comparing the average moving speed, the average velocity of the slot flow and the average velocity of the flow in the pipeline, the average moving speed, the average velocity of the slot flow and the flow velocity in the pipeline are compared with each other. When the length of the guide strip increases, the change rate of the average velocity of the pipeline car and the average velocity of the slot flow is obtained. The influence of different length of guide strip on the moving speed and the average velocity of slot flow of pipeline vehicle is analyzed. (6) the method of numerical simulation is used. The 3-D velocity of the helical flow field in the slot of pipeline car with different length of diversion strip is simulated and compared with the experimental results, and the results are in good agreement with the experimental results.
【学位授予单位】:太原理工大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TV134
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