Modeling Simulation and Temperature Control on Thermal Characteristics of Airborne Liquid Cooling System

Aiming at the temperature control of the liquid cooling system of aircraft electronic equipment, the thermal characteristics of the system under different temperature conditions are analyzed through model simulation, and a calculation method is given for the thermal design of the liquid cooling system. This paper simplifies the system and establishes a numerical calculation model for the heat transfer of the main components (such as liquid storage tanks, gear pumps, radiators, etc.). The temperature changes in the main components of the system within the operating temperature range of the system (-40 °C-50 °C) were calculated, and the thermal characteristics of the cold plate were obtained by using the AMESim software. Further, temperature control schemes of several liquid cooling systems are compared for their working efficiency under low temperature and over-temperature conditions based on the original model. The results show that the temperature index of the airborne liquid cooling system basically meets the technical requirements of the cold plate inlet temperature (5 °C-30 °C) under typical operating conditions. Under low-temperature conditions, the rapid heating of the cold plate can be achieved through the electric heater control scheme. Under high-temperature circumstances, opening the ram air port scheme has a better cooling effect than increasing the fan speed scheme, but the former needs to consider the flight conditions to avoid the cold plate temperature exceeding the target range.