Research On Microchannel Design And Its Thermal Performance Of Phased Array T/R Components

With the development of MEMS technology,the integration of electronic components is getting higher and higher,the heat-flow density is gradually increasing,and the high-efficiency cooling technology has gradually become a hot research topic.Because of the important role of phased-array antenna in the military field and civil field,it has been widely studied at home and abroad,and it is more and more urgent to study the high-performance phased-array antenna,and the thermal design of antenna is the key index to improve its performance,so the phased-array antenna has a high cooling demand.Compared with the traditional air-cooled cooling technology,liquid-cooled cooling has become the mainstream of research because of its high thermal efficiency,which is mainly microchannel liquid-cooled cooling technology.A large phased-array antenna has thousands of T/R components,and this paper designs a microchannel cold plate with a complex topology for the 5-by-5 phased-array T/R components,and analyzes the thermal performance of the microchannel cold plate through simulation calculation and experimental verification.The main research contents of this article are as follows:(1)To 5 x 5 phased-array T/R components as the research object,based on heat transfer and fluid dynamics theory,design a divergent partition-type porous microchannel cold plate topology,in order to achieve the phased-array T/R components vertical,horizontal electrical connection and improve the strength of the cold plate,also has six prism cylindrical hole in the channel,in order to facilitate the analysis of the model after-treatment,based on the theory and experience to do the cold plate structure reasonable simplification.(2)Simulation anslysis of microchannel cold plate,the simulation temperature cloud map and pressure drop characteristics are obtained by setting the boundary conditions of non-geometric factors such as heat flux of heat source,temperature and flow rate of fluid working medium.The heat dissipation performance of microchannel cold plate under different working conditions is analyzed,and the factors affecting the heat dissipation performance of microchannel cold plate are summarized.The pressure loss along the structure was analyzed based on the principle of pressure loss,and the thermal stress,that is,the thermal strain characteristics,of the microchannel cold plate were analyzed based on the heat-flow coupled mathematical model.Meanwhile,the strength of the microchannel cold plate was verified,so as to determine the rationality of the structure design and the temperature averaged performance.(3)By comparing the advantages and disadvantages of different manufacturing processes of microchannel cold plate,metal 3D printing technology was selected to process the real object and evaluate the machining accuracy and sealing of the real model.The heat dissipation performance of the microchannel cold plate was experimentally verified.An experimental platform was built according to the experimental principle to measure the inlet and outlet pressure drop and temperature distribution cloud maps under different working conditions.The pressure drop and temperature data were summarized.