热流固耦合下T型管道疲劳分析

为研究热流固耦合下对T型管道疲劳寿命的影响，基于ANSYS有限元软件对管道流场内的压强场、速度场的演变规律进行研究，根据相关性理论，引用皮尔逊相关性系数对结果进行相关性分析。结果表明流场区域内的压强和速度的变化规律同主支管温差关系极小，与主支管速度差关系密切；通过流固耦合分析得到管道在受流场复杂应力以及不同管道初始应力的情况下所产生应力的变化规律，发现管道最大等效应力出现在T型连接处和固定端附近；根据皮尔逊相关性系数发现管道最大应力以及危险点处的疲劳寿命同主支管温差关系显著。

Fatigue Analysis of T-pipe Under Thermo-Fluid-Solid Coupling

For the purpose of studying the effect of the thermal-fluid-solid coupling on the fatigue life of T-pipe, the evolution of the pressure and velocity fields in the flow domain of the pipe was studied based on ANSYS finite element software, and the results were correlated according to the correlation theory and the Pearson correlation coefficient. The results show that the variation of the pressure and velocity in the flow field area has very little relationship with the temperature difference of the main branch pipe, and is closely related to the velocity difference of the main branch pipe. The variation of stresses in the pipe under complex stresses in the flow field and different initial stresses is obtained through the fluid-solid coupling analysis, and it is found that the maximum equivalent stresses in the pipe occur near the T-joint and the fixed end. On the basis of the Pearson correlation coefficient, the maximum equivalent stresses of the pipe and the fatigue life at the danger point were found to be significantly related to the temperature difference between the main branch pipe.