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<p>To accurately predict the lubrication and cooling performance of high-speed, heavy-load aviation bearings under operating conditions, this study aims to establish a more precise thermal analysis model for bearings. A combined approach of computational fluid dynamics (CFD) simulation and experimental testing was employed to systematically investigate the convective heat transfer coefficients (CHTCs) of various inner surfaces within the bearing. In the study, the outer ring temperatures calculated using existing overall empirical formulas and CFD coupling methods were first compared and analyzed with experimental data. Based on this, an innovative new method using a localized approach was proposed to calculate the CHTC of different inner wall surfaces. Experimental results show that when the traditional overall method is used to determine the CHTC, the maximum error in outer ring temperature calculations reaches 20%; however, when the localized method proposed in this study is applied, the maximum error is only 4.47%, which significantly improves the accuracy of temperature prediction. Further research into the flow field structure and temperature field within the bearing cavity revealed that after applying the localized CHTC calculation method, more lubricating oil can be retained on the internal surfaces of the bearing and the ball surfaces, resulting in lower temperatures within the cavity and a more uniform temperature distribution on the ball surfaces. This study provides a more reliable simulation prediction model for the lubrication and cooling design of aviation bearings.</p>

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Effect of convective heat transfer coefficient (CHTC) on the lubricating oil flow and characteristics of heat transfer in high-speed and heavy-load bearing

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Yaochi Zhang,
  • Jianyang Zhu,
  • Xu Wang,
  • Yifan Zhang,
  • Le Gu

摘要

To accurately predict the lubrication and cooling performance of high-speed, heavy-load aviation bearings under operating conditions, this study aims to establish a more precise thermal analysis model for bearings. A combined approach of computational fluid dynamics (CFD) simulation and experimental testing was employed to systematically investigate the convective heat transfer coefficients (CHTCs) of various inner surfaces within the bearing. In the study, the outer ring temperatures calculated using existing overall empirical formulas and CFD coupling methods were first compared and analyzed with experimental data. Based on this, an innovative new method using a localized approach was proposed to calculate the CHTC of different inner wall surfaces. Experimental results show that when the traditional overall method is used to determine the CHTC, the maximum error in outer ring temperature calculations reaches 20%; however, when the localized method proposed in this study is applied, the maximum error is only 4.47%, which significantly improves the accuracy of temperature prediction. Further research into the flow field structure and temperature field within the bearing cavity revealed that after applying the localized CHTC calculation method, more lubricating oil can be retained on the internal surfaces of the bearing and the ball surfaces, resulting in lower temperatures within the cavity and a more uniform temperature distribution on the ball surfaces. This study provides a more reliable simulation prediction model for the lubrication and cooling design of aviation bearings.