Thermal-Flow Coupling Simulation Analysis of Spiral Channel Water Cooled Radiator for High Power Thyristor

High power thyristor is the core switching device of pulse power source, which is an important component of electromagnetic launch (EML). So the reliability of high power thyristor directly affects the safe and reliable operation of EML. Semiconductor theoretical and experimental studies show that the electrical characteristics of thyristor are directly related to the change of junction temperature. In this paper, a spiral flow channel water-cooled radiator applied to cooling thyristor is analyzed to study its flow and thermal diffusion characteristics. And, its performance under different inlet flow rate, inlet temperature and heating power are compared. The results show that countercurrent design of adjacent channel is effective to maintain the uniformity of temperature distribution; and compared with inlet temperature or heating power, inlet flow rate has a greater impact on the performance of the radiator. Key words: EML, Pulse power supply, High power thyristor, Water cooled radiator, Spiral-Channel, Thermal-flow coupling simulation