| Citation: | JI Fenzhu, ZHANG Mengjie, WANG Rui, et al. Blade design and aerodynamic performance numerical simulation on ram air turbine[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(7): 1387-1394. doi: 10.13700/j.bh.1001-5965.2017.0514(in Chinese)
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Ram air turbine (RAT) is a part of the emergency energy system in plane. It can extract energy from airflow through rotating turbine. Design of turbine blade and study on aerodynamic performance are the key for utilizing airflow energy efficiently. Aimed at the power needed by some type of emergency energy system, we designed turbine blade based on the momentum-blade element theory. Then aerodynamic performance of RAT is simulated by using computational fluid dynamics (CFD) method. Besides, the method of multiple rotation frame (MRF) is used to simulate 3D mixed flow field of the RAT where the pitch angle is adjustable. The performances of turbine power and rotor power coefficient are studied varying with airflow velocity and flight altitude. Distribution of pressure and velocity on blade surface are analyzed. The results show that the extracted power and rotor power coefficient of RAT vary with airflow velocity and pitch angle. RAT has different dynamic performance at different flight altitudes in the flight envelope. Constant power could be obtained by adjusting the pitch angle of RAT. Besides, flow state of the whole field is ideal, but there is still room to improve.
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