Study Of The Key Technologies Of The Cooling System In Wz Series High Pressure Gas Quenching Furnace

High pressure gas quenching is one of the most promising vacuum heat treatment technologies in the twenty-first century. It has many advantages such as no oxidation, no decarbonization, excellent surface quality, little deformation and excellent mechanical performance of heat treated workpieces and less or no pollution as well. In recent years, it has been one of the research focuses in the field of heat treatment technology. Fluid dynamics, computational fluid dynamics (CFD) and numerical simulation technology are integrated to design and study the cooling system of the high pressure gas quenching.In the cooling system, it needs to improve the efficiency of the centrifugal blower. The impeller which has a complicated geometry configuration is the key part of the centrifugal blower, gas transfer from the inlet to the outlet is realized in the impeller. A full-scale study on the performance of the centrifugal blower including theoretical analysis and numerical study is carried out in this thesis. Both the theoretical analysis and CFD method are introduced and validated by experimental data, which indicates that the CFD model matches the test results more. Numerical calculation can obtain plenty of detail of flow field as well as conduct different kinds of ideal condition numerical test expediently. Researches covered a wide field, so it saved tremendous amounts of money and shortened cycles of research. Therefore, correct numerical study of the related flow field of impeller has important meaning to optimize the performance of the centrifugal impeller.Furthermore, The gas flow in the wind tunnel and nozzle of the cooling system was simulated and the effect of various factors such as the chamfer of caecum of wind tunnel, the distance between the nozzle and caecum of wind tunnel, the length of nozzle, the dimensions of the radius chamfer of the nozzle, the shape of the nozzle on the outlet velocity of nozzles was studied. The simulation results show that the nozzle with cone shape and the increase in the dimension of the radius chamfer of the nozzle improve the gas velocity and its uniformity of distribution.