Development And Performance Research On The Environmental Control System For A Certain Type Of Electronic Equipment Pod

Aircraft pod is a kind of equipment that mostly mounted under the wing or the fuselage of fighters to enhance their tactical capabilities. For electronic equipment pod, too high or too low temperature is detrimental to normal working of the equipment, too high temperature may even cause equipment failure. Therefore, the temperature control of the air inside the pod is very important, due to the restrictions of its mounting position, the environmental control system in the aircraft cannot provide cooling air directly to the pod, for this reason, electronic equipment pod must be equipped with an independent environmental control system.At present there are two environmental control system for aircraft pod at home and abroad : reversebootstrap air cycle system and evaporation cycle system. In this paper, works done are as follows: firstly, a evaporation cycle system was selected as a cooling source, according to the thermal load and flight condition of the aircraft, control scheme for the system was designed, refrigeration unit and heating unit can be opened and closed by the solenoid valve that control with temperature. Secondly, the structure of the condensers and evaporators and other major components was designed, then calculation was done to check the performance of the components. The mounting position and solid modeling of them were also designed. Thirdly, simulation software FLUENT was applied to calculate the overall performance of the pneumatic system that comprised by air intake, condenser and the outlet fan. Through the analysis of the distribution of temperature field and velocity field on different cross section, the effects of air flow on the heat transfer process of condenser was obtained, then according to the simulation results further improvements were made to the cabin structure. Finally, ground test equipment was used to test cooling capacity of the system under different conditions and temperature. In the test, the temperature in test chamber is kept within a certain range, then power dissipation changes of the heating device was recorded to get cooling capacity of the system indirectly. Test results showed that the control scheme is feasible and refrigerating output of the system is enough meeting the design requirement.