基于流体冲击对管道转弯处作用力影响分析

Analysis of the influence of fluid impact on the force acting on the bend of pipe

液压油流过弯道时,形成双螺旋紊流流动特性,紊流作用力对管道稳定性产生影响。为了探求流体冲击对管道不同弯度下等效作用力和管壁应力的影响,分析了五种弯曲角度下管道等效作用力与应力、应变。仿真结果表明:流体流经弯头处将产生额外阻力,该阻力趋于打破管道的稳定;角度大小改变会导致弯头处进出口两端应力发生较大的波动,影响管道的稳定性;随着弯头角度变大,管道内壁纵向应力呈现先减小后增大的变化规律,而两侧径向应力则一直变大;直管管壁应力对称,更具有强的抗干扰性。研究成果将为液压管道系统减振提供参考。

When the hydraulic oil flows through the bend,the turbulent flow is formed,and the turbulence forces have effects on the stability of the pipe.In order to study the influence of the fluid impact on the equivalent force and the stress of the pipe wall,the equivalent force and the stress distribution of the pipe wall are analyzed and compared under five bending angles.The simulation results indicate that when the fluid flows through the elbow,the extra resistance will occur,and the resistances tends to break the stability of the pipe;the bending angle will change at both ends of the stress fluctuation of import and export of elbow,affects the pipeline stability;with the bending angle increasing,the pipe inner stress decreases after the stresses on both sides increase gradually;as the 180°straight pipe wall’s stress has symmetry,it has the capability of anti-interference.The results provide a reference to the vibration reduction of hydraulic pipeline system.