Abstract
In this paper, the environmental control system of aircraft driven by a power turbine is further analyzed. Through the numerical simulation of the change of the bleed state under different flight conditions and the change of the flow field under different nozzle opening, the simulation results are verified by the experimental results, and the specific change rules of the power turbine output torque, power, and bleed flow are obtained. It is analyzed quantitatively that adjusting the adjustable nozzle ring can keep the output power stable, widen the flight envelope, and improve the stability of the environmental control system.
Highlights
E variable geometry supercharger can continuously adjust the effective flow cross-sectional area of the turbine inlet according to the engine operating conditions, change the turbine inlet airflow parameters, and change the supercharging pressure, so as to achieve a good match between the supercharger and the engine and improve the engine transient responsiveness, reducing transient emissions
At present, there are few studies on power turbines using variable nozzle replacement used in aircraft environmental control systems [5]. is paper further studies the dynamic performance of the power turbine in the aircraft environmental control system after the variable nozzle ring is used and the change rule of the variable nozzle ring when the bleed air pressure and temperature change
In the traditional environmental control system, after the air is discharged from the engine, the absolute pressure regulator is needed to control the pressure, and the temperature of the future gas passing through the precooler is controlled within a certain range [11]. is process wastes a lot of energy. e environmental control system driven by the power turbine exhausts air directly from the engine, eliminating the need for precooler and absolute pressure regulator, which realizes the full utilization of energy and reduces the weight of the system [12]
Summary
Is article uses ANSYS ICEM software to model and mesh the power turbine in three dimensions. The model is divided into three parts: a volute, a diffuser, and a blade, and the interface is used as an interface to connect the three models. In FLUENT, the dynamic numerical simulation of the power turbine is carried out using the sliding grid method
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