To enhance the heat transfer efficiency of boiler tubes

the temperature field and thermal stress distribution was numerically simulated for the double layer pipe by using ANSYS software

on the basis of the coupled physical field.In addition

to accurately describe the water flow resistance characteristics

the rubber plug inside the boiler tube was taken as the research object to establish a two dimensional model for the boiler tube and the rubber plug.Then

combing the nonlinear structure with fluid mechanics

the fluid solid coupling analysis was performed for the boiler tube.The results show that

the stress change of the two-layer tube with different materials was smaller than that of the single-layer tube with the same material

and the temperature distribution was in accordance with the heat transfer law.The rubber plug located at the fluid solid coupled region

and the flow field distribution around it agreed well with the regularity of fluid motion

the stress and displacement changes conformed to the structure analysis of the regularity.This result provides a reference for the optimization design of the rubber plug and can improve the heat transfer efficiency of the boiler.