Research On Reverse-bootstrap Air Cycle Refrigeration System Driven By Powered Turbine

Airplane pods have been paid more and more attention, and it must equip a separated environment control system which has high reliability requirements and is subject to the power, volume and quality. Moreover with the thermal load of the equipments is increasing, the system will be demanded higher.The existing environment control system can not meet all the requirements, so a new cooling system for airplane pods was put forward, which is called reverse-bootstrap air cycle refrigeration system driven by powered turbine. This paper is concentrated on the research of the reverse-bootstrap air cycle refrigeration system driven by powered turbine.Based on a typical flight profile, firstly the mathematical models of the components (including air inlet, turbine, air compressor and heat exchange) of the system were established, the system design parameters were determined, the design calculation was done, the relations of the performance in the different parameters(including height, mach number and air flow) were analyzed, and the affect of components on system performance was studied; then taking into account the recovery of the cold, a new reverse-bootstrap air cycle refrigeration system with a heat exchanger driven by powered turbine was proposed, the design calculation and compensation loss calculation was done, the relations of the performance in the different parameters were analyzed, and its application range was determined; next the appropriated objective function was identified, and the optimization design was presented; at last, the experiment of the system was planned.The results show that:1. Reverse-bootstrap air cycle refrigeration system driven by powered turbine is simple,has high reliability, and can obtain more cooling capacity to meet the demand of high heat load of electronic equipment.2. With the height, mach number and the air flow of turbines increases, the cooling capacity of the system increases.3. The efficiency of cooling turbine has the maximum effect on the system performance by comparing the calculation results.4. Reverse-bootstrap air cycle refrigeration system with a heat exchanger driven by powered turbine can obtain more cooling capacity and is suitable for the flight state of high cooling capacity and high mach number.5. With the height creases, the cooling capacity of Reverse-bootstrap air cycle refrigeration system with a heat exchanger driven by powered turbine decreases, and with the mach number and the air flow of turbines increases, the cooling capacity of the system increases.6. The optimization design can be achieved at the design state.