ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Ratio of propeller thrust to total thrust of ducted propellers
Received date: 2024-06-17
Revised date: 2024-08-13
Accepted date: 2024-11-05
Online published: 2024-11-18
Supported by
National Key R&D Program(2022YFE0207000)
The design of ducted propellers is much more challenging than that of isolated propellers， as the complexity of the interference between the duct and the propeller makes it difficult to determine the induced velocity at the propeller. In the present study， a momentum model of ducted propellers is established. Based on the model， the ratio of the propeller thrust to the total thrust of ducted propellers， denoted as k， is analyzed， and its relationship with the induced velocity at the propeller is obtained. Furthermore， the variation law of k in the hovering and forward flight states is revealed by numerical analysis based on Computational Fluid Dynamics （CFD） simulations. For a given duct configuration， the following variation law of k is found： in the hovering state， k hardly varies with the change of the propeller’s rotational speed； in the forward flight state， the k value and the thrust coefficient of the ducted propeller show a linear relationship. The linear relationship is independent of both the rotational speed and the incoming wind velocity， which is very beneficial for establishing an engineering model about the value of k. In addition， the uniform law of k values for ducted propellers with different number of blades is revealed. The present study enriches the theoretical understandings about ducted propellers and has potential values for application in the ducted propeller design.
Key words： ducted propeller; eVTOL; momentum theory; aerodynamics; thrust ratio
Xudong LI , Wei ZHONG , Zhen WANG , Tongguang WANG , Jinlong LI . Ratio of propeller thrust to total thrust of ducted propellers[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2025 , 46(4) : 230829 -230829 . DOI: 10.7527/S1000-6893.2024.30829
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