Numerical Simulation Of Flow Field And Heat Transfer During Atomized Gas Quenching

As a new quenching medium, atomization has some unique advantages. It has received increased attention for its high quenching effect, lack of pollution, and low cost. However, due to its late start atomized gas quenching technology is still in the experimental research stage. There still remain some difficulties with both the development of quenching equipment and testing the quenching results.With the rapid development of computer technology and the improvement of quality standards in quenched specimens, numerical simulation of the quenching process has become more and more important. At present, the field of simulation research is underdeveloped at home and abroad. There is a need to do a more in-depth and detailed study of the building of models, the use of numerical methods, the verification of simulation results, etc.Addressing these issues, this paper's method of research is a combination of simulation results and test results. It focuses on the gas-liquid two-phase turbulent flow, temperature, and strain and stress fields of the quenching specimen in the process of atomized gas quenching.Firstly, this paper established a two-dimensional gas-liquid two-phase turbulent flow of the finite volume model using the finite volume software FLUENT, simulating respectively the two models. One gap between the gas collection and wall plate of the quenching chamber is large while another is small. The simulation results showed:Set gas film can do the task of gathering and diversion better in the small gap model.This paper simulates the three cavity model in which quenched specimens were placed in different positions. The simulation results revealed that it is best when the quenching specimens are placed in the upper chamber.Then, simulation turbulent parameters and the distribution of the gas -liquid two phase in the two-dimensional gas-liquid two phase turbulence model can be determined by analyzing the simulation of the turbulent kinetic energy, turbulent intensity, turbulent viscosity ratio, etc. I can verify the accuracy of the selected turbulence model. This can be seen by nitrogen and water distribution equipment using speed, density and volume fraction of the distribution of nitrogen and water, as to verify the feasibility of boundary conditions.Finally, I established the two-dimensional heat transfer model and grid model of quenched samples with finite element software ANSYS. Simulating the temperature, strain and stress field of the quenching specimen numerically, and comparing it with the simulation results and experimental results, showed they are similar and can verify the accuracy of atomized gas quenching.