Quadruple 11 - High The Straightener Roller Fluid-structure Interaction Heat Transfer Analysis

11-high plate hot leveler works in a atrocious environment, including strong straightening force to bear, the thermal shock of plate at high temperature (including thermal radiation, heat conduction and thermal convection), the temperature decrease of internal and external cooling water and other complicated loads effects. The alternating thermal stress generated when the machine is working will lead the straightening roller to break or fail. As the structure and motion of straightening roller are very complex, it is not easy to be investigated. In order to stimulate the real working state exactly and get accurate numerical simulation result, also to meet the needs of optimum design, the multi-physical field coupling effect of straightening roller is considered. The temperature field and internal flow field of straightening roller under the hydro-solid-thermal coupling effect are analyzed fot the 11 -high plate hot leveler, so that we can get better life estimation and system optimization for straightening roller. The main contents and innovative points in this paper are as follows:(1) Consider the complex structure and atrocious work environment of straightening roller, we make a Hydro-solid-thermal Coupling Mechanical Model for straightening roller. In the mechanical model, many factors, including thermal radiation, thermal convection and heat conductive of straightening roller and high temperature plate, the rotary motion of straightening roller and the motion of internal cooling water, is considered. The cooling effect of the internal and external cooling system is also considered. An entity straightening roller model is built based on its real complex structure consisted of blind holes for water to get through, rotary joints, etc.(2) The reasonable boundary conditions of thermal field and fluid field is set for the mechanical model according to real working condition. Considering the motion of straight roller around axial line leads to temperature field and flow field of straightening roller, the air and internal cooling water change with time, the dynamic mesh method is used to simulate the straightening roller's rotary motion. The UDF function based on Visual C++ is compiled. Beside this, the non-uniform mesh generation technique is applied to partly encrypt the straightening roller, so as to assure the calculation efficiency and precision.(3) The complex internal cooling water flow field in straightening roller is calculated by the use of a computational fluid dynamics software FlUENT. Then the different rapidity of water flow effect on fluid field is discussed. We make a quantitative calculation about water flow speed effect on how much the internal cooling water decrease the straightening roller's temperature and the effect on inner surface force of straightening roller. It is found out that the rotary motion of the straightening roller make the motion trajectory of internal cooling water as spiral development, and the internal cooling water generates a tangential speed. Design the inner fluid field structure of straightening roller reasonably is very important for its internal cooling.(4) The steady temperature field and transient temperature field of straightening roller are simulated. Considering the effect of refrigeration and cooling, we give the temperature distribution of straightening roller, internal cooling water and external air at different time. The result shows that the temperature of plate has a significant effect on the steady temperature field of straightening roller, the straightening roller's temperature has a linear variation as the temperature of plate changes, and the circumferential temperature of the straightening roller has a sudden change on the plate.