摘要
针对洪水冲击含有内流流动的管道时所形成管跨的危险临界长度的研究问题,介绍了微分求积法的原理、适用条件及其用于有限元运算的优势。分析了洪水作用下管道的激振频率、固有频率、共振条件,以及内流对于管道动力特性的影响。针对管内流动与管外洪水冲击对于管道的作用,建立了内、外流共同作用下的管道动力控制方程,并基于微分求积法(DQM)进行了求解。该方程既可用于稳定流动也可用于不稳定流动,同时考虑了洪水冲击及内部流动,具有较广的适用性。通过该方程可以计算出洪水冲击下所形成管跨的危险长度。通过一条实例管道分析得到,对于洪水冲击下的管道问题应该考虑内外流的共同作用,且内流的速度、压力、密度都会对管跨长度产生影响,这些结论对于现场实际或设计均极具参考意义。
In order to understand the critical length of a pipeline span, we briefly introduce for principles and suitability of differential quadrature method, and its advantages in Finite Element methods. The method could obtain a high accuracy at a cost of less computing, while more suitable for programming. Introduce the ways of impacting pipeline by flood and its hazards, analyzing the excitation and natural frequency, also with resonance conditions, presenting dynamic characteristics effects of inner fluid flow. Meanwhile, introduce dynamic characteristics of impacted pipeline by flood, as well as effect on the span within internal fluid. Considering the impact from internal fluid and external flood, the formula is established based on DQM. The equation can be well applied in stable and instable fluid, while taking internal fluid into account. It can be widely used when calculating the limited length of an impacted span. Combining with a piece of actual pipeline, we present that when analyzing the impacted pipe, we should take internal and external fluid as well as velocity, pressure, density into account. It is guidance for inference of calculating limited span in design or urgent maintenance.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2013年第4期173-179,共7页
Journal of Southwest Petroleum University(Science & Technology Edition)
