Research On Airflow Organization And Heat Dissipation Optimization In Power Box Based On Coanda Effec

Electromagnetic induction heating is widely used as an energy-saving and environmentally friendly heating method in the fields of aerospace,vehicle manufacturing and heat treatment of metal materials.With the development of society,the requirements for the efficiency and performance of induction power supply are getting higher and higher,which also brings great challenges for the heat dissipation of power supply box.Electromagnetic induction power supply as the core equipment of induction heating system,its safety is crucial to the development of induction heating technology.If the heat of the power supply components cannot be exported in time,it will cause thermal failure of the components and other problems,affecting the failure rate and service life of the equipment.Therefore,it is crucial to improve the heat dissipation efficiency of the power supply box.In this thesis,numerical simulation and experimental methods are used to study the airflow organization and heat dissipation characteristics of an80 k W induction power supply box,and the main research contents are briefly described as follows:(1)Loss calculation and heat dissipation method analysis of typical components of power bank.Through theoretical analysis,the loss composition and calculation methods of the main heat dissipation components IGBT modules and transformers in the power bank are discussed,and the heat transfer methods of different components in the heat dissipation process are analyzed,and the heat dissipation methods are determined based on the heat dissipation characteristics of the components and the advantages and disadvantages of the common heat dissipation methods,and the forced air cooling heat dissipation method is used to lay the foundation for the later research on the heat dissipation characteristics of the power bank.(2)Numerical simulations of thermal-flow coupling were performed on the power bank to study the airflow organization and heat dissipation characteristics under the original model.The temperature rise of each component is 56.9℃ for IGBT1,55.6℃ for IGBT2,and 50.8℃for transformer.The simulation results are compared with the field measurement results,and the error range is within 5%,which meets the requirements of engineering calculation and verifies the feasibility of the numerical simulation calculation of the power supply box.At the same time,through the analysis of the distribution of airflow organization in the power supply box,it is found that the airflow organization in the power supply box is disordered,short-circuited and uneven,which causes a serious waste of cold air and affects the heat dissipation effect of the power supply box.(3)Optimized design and heat dissipation characteristics analysis of the power supply case.Based on the principle of high ventilation efficiency and low cost,the air duct structure of the case is improved,and the optimization analysis is carried out in three aspects based on the Kanda effect by adjusting the bottom air inlet,setting the inflow structure and adjusting the number of air inlets,and making parametric adjustments to each optimization scheme.The heat dissipation characteristics of the eight optimized solutions are studied by numerical simulation,and the best optimized solution is determined based on the analysis and comparison of the temperature and velocity fields in the power supply case.Scheme 3.3 is the best optimized scheme,according to the Kanda effect,the bottom air inlet is modified,and the air inlet size is5mm;the width of the deflector plate is 10mm;the number of side air inlets is halved,and the front lower air inlet is changed from two rows to one row.Compared with the original model operating conditions,the transformer,IGBT1 and IGBT2 temperatures decreased by 23.7%,11.1% and 10.2%,respectively.(4)Experimental verification and thermal characteristics analysis of the power supply optimization scheme.An induction heating power supply temperature rise experimental platform was built to analyze and study the thermal characteristics of the optimized scheme for the actual prototype.The results show that the temperature of the transformer,IGBT1 and IGBT2 decreases by 5℃,3℃ and 2℃ respectively after optimization,which verifies the feasibility of the optimized solution.