Research On Thermal Design And Thermal Management System Of Active Phased Array Antenna Cold Plate

With the rise of micro-systems and"intelligent"manufacturing technology,the size of equipment is getting smaller and smaller,and the trend of miniaturization is becoming more and more obvious.While the size of the device is decreasing,power consumption and integration are increasing.The problem of device damage caused by the untimely heat dissipation is also becoming more and more serious.Thousands of power devices are distributed on the array surface of the phased array antenna.The chip integration is high,the heating power is large,and the working space is small.It is very easy to cause equipment damage due to temperature rise.Therefore,research on efficient heat dissipation methods is of great significance for improving the lifespan and usage scenarios of the equipment.Liquid cooling technology has high heat dissipation performance,especially microchannel heat dissipation technology,which has been widely studied by scholars from various countries because of its small size and high heat dissipation efficiency.This paper takes a phased array radar antenna as the research object,and proposes a hierarchical series-parallel microchannel radiator.The main research contents are as follows:(1)Aiming at the field of micro-channel heat dissipation,the relationship between the physical geometry and the heat dissipation effect is studied,and the principle basis of the heat sink design is explained.Taking a circular loop array antenna as the research object,according to its own structural characteristics,combined with the requirements of the highest temperature,temperature uniformity,and pressure drop when the equipment is working,based on the related theory of fluid heat transfer,a classification is proposed and designed Series and parallel micro-channel radiators.(2)The heat transfer characteristics of microchannel radiators in series and parallel were studied.By using numerical calculation method,the heat dissipation effects of five kinds of radiators with different physical structures were designed and optimized,and the optimal structure design was proposed.The calculation results show that when the inlet flow rate is 900m L/min and the heat source power is 20W,the structure of the radiator can reduce the maximum temperature of the antenna array unit to less than 100°C and the temperature uniformity to less than 5°C,which meets the equipment requirements.The focus is on the influence of geometric and non-geometric factors on the heat dissipation performance under single-phase flow.The heat transfer characteristics of pulsating flow under unsteady flow of microchannel radiator are studied.The results show that the maximum temperature of the heat source under pulsating flow is 5.2℃lower than that under steady flow.The fluid-structure coupling analysis is performed on the designed radiator,and the reliability of the structure is measured by the amount of thermal deformation.The calculation results show that the maximum thermal deformation of the radiator is 0.09mm under actual working conditions,which does not exceed the threshold0.2mm.Through theoretical derivation and calculation,the performance of the radiator is evaluated from the thermal resistance and heat exchange area.The results show that the minimum thermal resistance of the optimized radiator is 0.35K/W,and the fluid-solid heat exchange area reaches the maximum of 2840mm~2,further verification The rationality of the structural design of the radiator is improved.(3)Design and build a micro-channel heat dissipation experiment platform.Carry out the heat dissipation effect under the conditions of inlet flow,heat source power and other conditions and compare with numerical calculations.Experimental verification shows that the error between theoretical calculation and experimental value is within 5%,and the heat dissipation performance of the radiator is superior,reaching the heat dissipation index of a multi-chip array.In response to the harsh requirements of the antenna working temperature,based on the Internet of Things technology,an antenna micro-channel heat dissipation management platform was designed and developed,and through the online test of experimental data,the verification of specific functions was completed,and the temperature warning and online real-time of the equipment were realized.Monitoring function.