Selection And Performance Research Of Heat Sink Of High-Pressure Frequency Transformers

Radiator is one of the most important components in the coolling system offrequency inverter, which has a significant effect on running security and stableoperation. Due to that many advanced technologies which include driving AC, powerconverter in high frequency technology, were gradually adopted, the unit volume of theheat radiated (heating density) is becoming higher and higher, thus, the capacity of thecooling system needs more and more improvements. The cooling problem of thefrequency converter become the bottleneck of the development, Studying on the propertiesof the radiator which the high voltage inverter used in this paper,to improve the ability of thecooling system is the main purpose of this paper continually.Based on the CFD method in this paper, we carried out a series of performancesimulation concerning radiator of frequency converter. Calculated the heat loss of powerunit in high-voltage inverter which Harsvert-A06/type300model2500KW andaccording to the heat loss, choosing related radiator.To simulate different type radiatorrib; understand the heat dissipation characteristics through the simulation results.Simulating needle radiator and straight rib radiator which selected， Analysised coolingperformance of these two kinds of different type radiator.Straight rib radiator and needle radiator were carryed out simulation, and then wecome up with straight fin-root, needle rib velocity field, Temperature field，the thermalefficiency curve for straight fins, cylindrical fins, Using simulation and experimentaldata analysis performance of the different radiator, Verify the correctness of the simulationthrough the experimental results. Through the simulation and experiment result can get thefollowing conclusions:(1) the highest temperature is352K for Straight rib of theradiator power module，the speed uneven High direction, the blind area of speed isbigger，Effective cooling area is reduced, the effect of cooling not good;(2) the highesttemperature is345K for Needle radiator of power module, The speed well-distributed inradiator internal, Speed of blind area is smaller，Turbulence intensity，Heat obvious.(3)By changing the rib spacing and fin-root height, eventually determine the distancebetween fin-root6mm to7mm, fin-root height was determined in70mm to80mm,speed blind area was minimum, efficiency is the highest.