Analogue Simulation for Local Damage of Drain Pipe

For the leakage of variable diameter drain pipe caused by local thinned area,the synergism of cavitation and erosion is regarded as the main factor.In order to obtain the distribution of damage,CFD code was used.The calculated result shows that static pressure reaches its minimum at the small-end of conical pipe behind the valve and is lower than the vaporization pressure,which will cause the cavitation,and maximum of shear stress appears at the same position,which accelerates the erosion effect of fluid.Furthermore,corresponding proposals are put forward to prevent the conical drain pipe from local damage.