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Study on 3D computational method of conjugate heat transfer between internal and external flow for nacelle anti-icing system

  

  • Received:2022-05-12 Revised:2022-09-27 Online:2022-09-30 Published:2022-09-30
  • Contact: Mei ZHENG

Abstract: In order to improve the efficiency of anti-icing performance evaluation and support the design of nacelle anti-icing system, the research on three-dimensional (3D) computational method of conjugate heat transfer between internal and external flow for the nacelle inlet piccolo hot air anti-icing system is carried out, which is based on the loose-coupling method. The exter-nal flow field, skin solid domain and internal flow field in the 3D nacelle model are divided into two computational domains. The wall temperature and heat transfer coefficient (HTC) on the external surface of anti-icing chamber are taken as interac-tive data between the internal and external domains to realize the conjugate computation. According to the flow and heat transfer characteristics on anti-icing surface under dry and wet air conditions, considering the mass and energy source terms generated by supercooled water droplet impingement and the 3D runback effect caused by the circumferential asymmetry of nacelle inlet, the loose-coupling iterative strategies for dry and wet air conditions are summarized respectively. The results show that under the dry air condition, the calculation of conjugate heat transfer between internal and external flow can con-verge in 3 rounds of loose-coupling iteration; under the wet air condition, the calculation for nacelle inlet inner surface tends to converge after 4 rounds of iteration but that for outer surface continues to fluctuate due to the influence of surface run-back flow and heat transfer during the iteration.

Key words: nacelle anti-icing, conjugate heat transfer between internal and external flow, computational method, surface tempera-ture, convective heat transfer coefficient

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