Abstract
This paper describes a model-based method for the control design of engine bleed air test facility for the bleed air system. In order to perform the control design, a dynamic simulation model for the facility is developed to simulate the dynamic behaviour. The main equipment dynamic modelling approaches are described. This simplified dynamic model may be used to perform trade studies and to optimize component characteristics for performance and cost comparison purposes. With the performance shown, this engine bleed air test facility should be quite capable to emulate the engine for bleed air system testing and evaluation.
Highlights
The environmental control system (ECS) of commercial aircraft contains several main subsystems as shown in figure 1
The excellent dynamic performance of the bleed air system is the guarantee for the normal operation of the environmental control system
The dynamic performance test of the bleed air system requires that the air temperature and pressure at the inlet of the pipeline can be rapidly changed
Summary
The environmental control system (ECS) of commercial aircraft contains several main subsystems as shown in figure 1. The ambient temperature varies from -55°C to 40°C, the pressure varies from 20 kPa to 101 kPa. The environmental control system is designed to control and regulate the interior environment of the aircraft cabin. The bleed air system is a highly coupled control system which regulates temperature and pressure of compressed engine bleed air and serves as the pneumatic air source for the downstream ECS subsystems. The excellent dynamic performance of the bleed air system is the guarantee for the normal operation of the environmental control system. The engine bleed air pressure and temperature can change rapidly, the pressure and temperature controlled by EBATF are necessarily fast responding. - Compressed air source: to provide high pressure air; - Heater: to heat the air for desired temperature; - Heat exchanger: to cool the air; - Control valve 1, 2: to perform temperature control; - Outflow valve 1, 2: to perform pressure control
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