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Effect of Jet–Wake Interaction around a Tip-Jet Rotor in Torque-Balanced States

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Abstract

Tip-jet rotors operate in an equilibrium state between aerodynamic torque generated by rotations and jet torque by a tip-jet. This equilibrium state is denoted by the torque-balanced state and a corresponding tip speed is called as the equilibrium tip speed. As a noteworthy result, consistent jet-wake interactions (JWIs) cause similar flow structures that is independent of tip-jet flow condition at a specified collective pitch angle. Accordingly, the constant induced flow ratio leads to the constant net thrust coefficient nondimensionalized with the equilibrium tip speed. Furthermore, at the torque balanced state, trajectories of the tip-jet vortices remain unchanged irrespective of blade tip speeds. The net thrust coefficient in real situation primarily depends on the collective pitch angles and the momentum theory for conventional rotor analysis can be applied to the tip-jet rotor in the torque-balanced state.

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Acknowledgements

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea Government (MSIT) (2021R1A5A1031868).

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Authors and Affiliations

  1. Department of Aerospace Information Engineering, Konkuk University, Seoul, 05029, Republic of Korea

    Daun Park

  2. Department of Mechanical and Aerospace Engineering, Konkuk University, Seoul, 05029, Republic of Korea

    Soo Hyung Park

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  1. Daun Park
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Correspondence to Soo Hyung Park.

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Park, D., Park, S.H. Effect of Jet–Wake Interaction around a Tip-Jet Rotor in Torque-Balanced States. Int. J. Aeronaut. Space Sci. (2024). https://doi.org/10.1007/s42405-024-00724-6

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  • DOI: https://doi.org/10.1007/s42405-024-00724-6

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