π形输流管道受力特性及结构优化

Force characteristics and structure optimization of π-type pipes

通过理论分析和ANSYS数值模拟对管内流体作用下π形管道的受力特性进行了研究,并从降低流体载荷出发对其进行了结构优化。研究表明:1π形管道结构所受内部流体合力一般较小而可以忽略,但流体合力矩却往往很大,是导致管道出现大变形的直接原因;2对于确定的管径、进口压力和流量,π形管道所受流体合力矩仅与两竖直管段的长度差有关,两竖直管段长度不一致是导致该类管道流体合力矩不为零的根本原因;3将π形管道设计成对称结构可以将其所受流体力矩降到最低,避免流体力过大导致的大变形问题。

In this paper, the fluid force on n-type pipes was investigated by means of theoretical analysis and ANSYS numerical simulation. And then, n-type pipes were structurally optimized from the view point of reducing fluid loads. Based on the study, the following conclusions are reached. First, the resultant force on n-type pipes from the inner fluid is generally small and can be ignored, but the resultant torque is usually very large and it is the direct reason for the large deformation of the pipes. Second, the resultant torque is only dependent on the length difference between two vertical parts of the n-type pipe, once the diameter, inlet pressure and flow rate of the pipes are set. Hence, the length difference between the two vertical parts is the key reason why the resultant torque of this type of pipes is not zero. And third, the fluid torque of n-type pipes can be minimized by arranging the pipes in a symmetrical pattern, so that large deformation induced by large fluid force can be avoided. （6 Figures, 14 References）