不同导叶长度的管道车在不运动条件下形成的同心环状缝隙螺旋流水力特性研究

发布时间：2018-05-06 23:25

本文选题：水力输送 + 管道车　；参考：《太原理工大学》2015年硕士论文

【摘要】：近年来，随着经济的发展，交通运输在国民经济中占据了至关重要的地位。传统的交通运输方式大都会对环境造成破坏，而随着人类整体环保意识的增强，传统的高耗能、高污染的运输方式逐渐不再适应时代的发展，因此亟需发展一种新型的低碳运输方式。筒装料管道水力输送便是符合这一要求的产物。筒装料管道水力输送作为新兴管道水力输送技术，是对传统管道水力输送技术的补充和完善，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（51109155）”和“管道列车水力输送能耗研究（51179116）”，，采用理论分析、试验研究和数值模拟相结合的方法，对不同导叶长度的管道车在不运动状态形成的同心环状缝隙螺旋流水力特性进行研究。得出了以下主要结论：（1）相同流量下，随着管道车导叶长度的增加，缝隙螺旋流的压强值，在车后断面和车前断面均表现为先减小后增大再减小的趋势，在车中断面表现为先增大后减小再增大的趋势，其中导叶长度l=0.25L时，三个测试断面平均压强最小。（2）相同流量下，随着管道车导叶长度的增加，缝隙螺旋流的轴向速度，在车后断面表现为逐步增大的趋势，在车中断面和车前断面均表现为先减小后增大再减小的趋势，其中导叶长度l=0.75L时，三个测试断面平均轴向速度最大。（3）相同流量下，随着管道车导叶长度的增加，缝隙螺旋流的径向速度，在车后断面表现为先减小后增大再减小的趋势，在车中断面、车前断面均表现为先增大后减小再增大的趋势，其中导叶长度l=0.5L时，三个测试断面平均径向速度最大。（4）相同流量下，随着管道车导叶长度的增加，缝隙螺旋流的周向速度，在车后断面表现为逐渐增大的趋势，在车中断面表现为先增大后减小的趋势，在车前断面表现为先增大后减小再增大的趋势，其中导叶长度l=0.5L时，三个测试断面平均周向速度最大。（5）相同流量下，对于带导叶的管道车，导叶凹侧水流的压强值大于位于导叶凸侧面的压强值，径向速度绝对值的大小关系与压强值的大小关系相同，轴向速度和周向速度绝对值的大小关系与压强值的大小关系相反。（6）同一型号管道车，缝隙螺旋流在车中断面的压强值大于车后断面、车前断面的压强值；缝隙螺旋流在车后断面的轴向流速的最大值出现在靠近车壁的缝隙中心，缝隙螺旋流在车中和车前断面的轴向流速最大值出现在靠近管壁的缝隙中心；缝隙螺旋流在车后断面、车中断面、车前断面的径向速度和周向速度大小的变化趋势均是先减小后增大。（7）利用FLUENT软件对管道车在平直段不运动状态下所产生的缝隙流的流场进行了数值模拟，分析了缝隙流场中的压强和三维速度的变化分布特性，并与实测试验对比验证，结果基本一致。本论文的研究成果对静边界缝隙螺旋流的研究和管道车在实际生产中的应用提供一定的理论依据。
[Abstract]:In recent years , with the development of economy , transportation plays a vital role in the national economy . Traditional modes of transportation can damage the environment , but with the enhancement of the whole environmental awareness of mankind , the traditional high - energy consumption and high - pollution transport mode are no longer suitable for the development of the times . Therefore , it is urgent to develop a new low - carbon transport mode .

This paper studies the hydraulic characteristics of concentric annular gap spiral flow formed by different guide vane lengths by combining theoretical analysis , test research and numerical simulation with the method of combining theoretical analysis , test research and numerical simulation . The main conclusions are as follows :

( 1 ) Under the same flow , as the length of the guide vane of the pipeline increases , the pressure value of the spiral flow of the gap increases and then decreases after the vehicle rear section and the front cross section of the vehicle are reduced , and the cross section performance of the vehicle increases first and then decreases the re - increasing trend , wherein , when the guide vane length l = 0.25L , the average pressure of the three test sections is minimum .

( 2 ) Under the same flow , with the increase of the guide vane length of the pipeline , the axial velocity of the spiral flow of the gap is gradually increased in the rear section of the vehicle , and the cross section of the vehicle and the front section of the vehicle show a tendency to increase the re - reduction , and the average axial velocity of the three test sections is the largest when the guide vane length l = 0.75L .

( 3 ) Under the same flow , with the increase of the length of the guide vane of the pipeline , the radial velocity of the spiral flow of the gap , the decrease of the cross - section of the vehicle after the reduction of the cross - section of the vehicle , and the trend of decreasing the re - increase of the cross - section and the front section of the vehicle , wherein the average radial velocity of the three test sections is the largest when the guide vane length l = 0.5L .

( 4 ) Under the same flow , with the increase of the guide vane length of the pipeline , the circumferential velocity of the spiral flow of the gap is gradually increased in the rear section of the vehicle .

and ( 5 ) under the same flow , the pressure value of the water flow on the concave side of the guide vane is larger than the pressure value positioned on the convex side of the guide vane , and the magnitude relation of the absolute value of the radial velocity is the same as the magnitude relation of the pressure value , and the magnitude relation between the axial speed and the circumferential velocity absolute value is opposite to the magnitude relation of the pressure value .

( 6 ) the pressure value of the cross section of the gap spiral flow in the vehicle is larger than that of the rear section of the vehicle and the pressure value of the front section of the vehicle ;
the maximum value of the axial flow velocity of the gap spiral flow in the rear section of the vehicle appears at the center of the gap close to the vehicle wall , and the maximum axial flow velocity of the gap spiral flow in the vehicle and the front section of the vehicle appears near the center of the gap near the pipe wall ;
The change trend of the radial velocity and the circumferential velocity of the gap spiral flow in the rear section of the vehicle , the cross section of the vehicle , the radial velocity and the circumferential velocity of the front section of the vehicle is reduced first and then increases .

( 7 ) By using FLUENT software , the numerical simulation of the flow field of the gap flow in the straight segment is simulated by FLUENT software , and the distribution characteristics of the pressure and the three - dimensional velocity in the gap flow field are analyzed , and compared with the measured test , the results are basically consistent .

The research results of this paper provide some theoretical basis for the research of static boundary gap spiral flow and the application of pipeline vehicle in actual production .

【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TV134

【参考文献】