Study on Ground-Test Simulation Method of the Ram Air for Commercial Airliners' Environmental Control System

摘要

Based on the equivalent heat transfer capacity, a closed simulation ground-test method of thernram air is proposed, it can provide the ram air’s test condition for deriving the performance ofrncommercial airliners’ aircraft environmental control system (ECS). Analysed results showrnthat the proposed method can simulate different temperatures and pressures at the range ofrn0~10km flight altitudes under the compressor pressure ratio of 1.2 and turbine expansion ratiornof 5. Temperatures and pressures can vary from -17.6～40℃ and 40～101kPa, respectively. Inrnthe meantime, compared to the traditional fan’s simulation method, the energy consumption isrndecreased about 35%. By analyzing the key factors in method, it shows that altitudes andrnACM characteristics can influence the power consumption and other conformance. Therefore,rnit needs to select ACM machine according to test requirements in engineering applications.