Optimization And Analysis For Four-wheel High Pressure Water Removal Air Cycle Refrigeration System

The external environment around aircraft changes acutely in flight, including the pressure changes,the temperature changes, and humidity changes. Therefore, how to keep the air pressure, airtemperature, air humidity, air velocity and air cleanliness in the cabin be content with the daily life ofthe passengers and aircrew and the reliability of equipments is crucial. The environmental controlsystems on the aircraft gradually developed from Freon refrigeration system into the air cyclerefrigeration system. Air cycle refrigeration system in turn experienced a simple air cycle refrigerationsystem, boost air cycle refrigeration system, low pressure water three boost air cycle refrigerationsystem, high pressure in addition to water three boost air cycle refrigeration system, high pressure inaddition to water four boost air cycle refrigeration system.This paper analyzes the four-wheel high pressure water removal air cycle refrigeration system. On thebasis of the system of traditional four-wheel, making some changes to the structure of the system, Iput forward another four-wheel high pressure water removal air cycle refrigeration system which bebased on co-axis. In order to determine such a two-axis system whether to play a more traditionalsystem optimization role, I used the entropy increment. exergy loss and total takeoff mass to analyze.When I do the analysis of entropy increment, mainly calculate the pressure, temperature, and specificexergy of system state point. Compare the two systems, we can find that the entropy increment in thetwo-axis system is litter than it in the traditional one.When I do the analysis of exergy loss, mainly calculate the pressure, temperature, and specificentropy of system state point. Compare the two systems, we can find that the exergy loss in thetwo-axis system is litter than it in the traditional one, and the exergy efficiency in the two-axis systemis higher than it in the traditional one.After analyzing the, for a single four-wheel system, I still analyze the effects about exergy loss causedby components, and got some conclusions.The analysis for total takeoff mass of the two systems is from the perspective of economic efficiencyto find which system has more advantages. It can be concluded by analyzing that the traditionalsystem has more advantages in the short voyage passenger aircraft and the fighter, on the other hand,the two-axis system has more advantages in the medium and long voyage passenger aircraft or thelarger carrying capacity (>200) airliner.