不同约束细长流管不失稳的临界流速

Stable Critical Flow Velocity of Long and Thin Tube with Different Constraints

为了确定高速细长流管的临界流速,以避免失稳造成振动和噪音。本文利用单元体模型受力分析列出定解方程,根据4种典型边界约束条件讨论了高速流管不失稳的液体流速最小临界值,并用数值算例给出了6种材质流管在3种典型约束条件下的最小不失稳理论流速,本文计算方法对于高速流管设计和使用具有一定的参考价值。

In order to determine the critical flow velocity of high-velocity flow tube which is long and thin,thereby avoiding vibration and noise caused by instability,the forces acting on an unit body model taken from the flow tube are analyzed and the determinate equations of the problem are formulated.According to four typical boundary constraint conditions,the minimum theoretical instable critical flow velocity of high-velocity flow tube is discussed.Under three types of typical constraints,the minimum theoretical critical flow velocities of high-velocity flow tubes being made of six different materials are calculated.The computation method given here has some reference value to the design and use of high-velocity flow tube.