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Aerodynamic behaviour of ice-debris inside dorsal S-shaped inlet based on overset mesh technology

Published online by Cambridge University Press:  08 April 2025

Y. Nie Open the ORCID record for Y. Nie [Opens in a new window] ,
B.K. Li Open the ORCID record for B.K. Li [Opens in a new window] ,
X.X. Yang ,
Y.P. Xie  and
H.Y. Zhang
Y. Nie
Affiliation:
Department of Engineering Thermophysics, Northeastern University, Shenyang, Liaoning, P. R. China
B.K. Li*
Affiliation:
Department of Engineering Thermophysics, Northeastern University, Shenyang, Liaoning, P. R. China
X.X. Yang
Affiliation:
Department of Engineering Thermophysics, Northeastern University, Shenyang, Liaoning, P. R. China
Y.P. Xie
Affiliation:
Shenyang Engine Research Institute, Aero Engine Corporation of China, Shenyang, Liaoning, P. R. China
H.Y. Zhang
Affiliation:
Shenyang Engine Research Institute, Aero Engine Corporation of China, Shenyang, Liaoning, P. R. China
*
Corresponding author: B.K. Li; Email: [email protected]
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Abstract

In response to the requirements for assessing the impact safety of aero-engines, a high-fidelity numerical simulation method based on overset mesh technology for six-degree-of-freedom rigid body motion is proposed. A gas-solid two-phase flow model is established, coupling two types of ice-debris (externally ingested ice and internally delaminated ice) with air, to analyse their behaviour in a dorsal S-shaped inlet with a diffusion ratio of 1.3. Results indicate that the ice-debris entering from the upper region of the entrance section exerts the most significant distortion on the total-pressure at the engine inlet. Additionally, the behaviour of ice-debris is determined by its angle with respect to the incoming flow direction and the shape of ice. Furthermore, although the ice-debris detached from the entrance section poses no immediate threat to the engine, the prolonged acceleration by high-speed airflow, with velocity increments exceeding 45 m/s, results in a higher kinetic energy carried upon impact with the inlet walls. Regarding externally ingested ice-debris, a smaller initial velocity corresponds to a higher probability of impacting the engine, accompanied by a significant increase in velocity. For instance, the irregular ice-debris ingested at an initial velocity of 6 m/s can experience velocity amplification exceeding 590%.

Keywords

dorsal S-shaped inlet duct6-degree-of-freedom motionoverset mesh technologygas-solid two-phase flowforeign object damage
Type
Research Article
Information
The Aeronautical Journal , First View , pp. 1 - 26
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Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of Royal Aeronautical Society

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