Thermal analysis and optimization of bionic cooling channels of gas foil thrust bearings

Qi Zhao, Shaohang Yan, Mingchen Qiang, Yu Hou, Tianwei Lai
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Abstract

Under high-temperature conditions, heat evacuation of foil bearing has a significant impact on bearing performance, including loading performance and reliability. During bearing operation, viscous dissipative heat in the lubricant gas film is the main source of heat generation. For foil bearings, enhancing the heat evacuation efficiency is essential to extend the bearing service life in high-temperature environments. For heat evacuation, foil-side cooling is a very effective method. For more in-depth analysis of thermal characteristics of the foil bearing, a three-dimensional (3D) thermal-elasto-hydrodynamic (TEHD) coupling model of multi-leaf thrust foil bearing (MLTFB) with cooling channel is established in this paper. In view of the good heat transfer performance and more uniform gas velocity distribution in bionic flow channels, various bionic cooling channels of foil bearings are proposed and the structural parameters are optimized. The effects of cooling channel type, cooling channel width, span ratio, cooling gas supply mode, and rotational speed on the thermal and loading performance of foil bearings are investigated. The studies demonstrate that the spider net round cooling channel exhibits higher heat transfer performance and improved uniformity of temperature. Compared to the cooling gas supply from inner edge, the cooling gas supply from the outer edge proves to be more effective. The maximum temperature of lubricant gas film can be greatly reduced with wider cooling channels and a smaller channel span at the outer edge. The maximum temperature of lubricant gas film and bearing load are reduced as the Reynolds number of cooling gas increases. There exists an optimal Reynolds number that can achieve the highest uniformity of temperature.
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气体箔型推力轴承仿生冷却通道的热分析与优化
在高温条件下,箔轴承的热排出对轴承性能有显著影响,包括加载性能和可靠性。在轴承运行过程中,润滑剂气膜中的粘性耗散热是产生热量的主要来源。对于箔轴承来说,提高热排效率对于延长轴承在高温环境中的使用寿命至关重要。对于散热,箔边冷却是非常有效的方法。为了更深入地分析箔片轴承的热特性,本文建立了带冷却通道的多叶推力箔片轴承的三维热弹流耦合模型。鉴于仿生流道具有良好的传热性能和更均匀的气速分布,提出了多种铝箔轴承的仿生冷却通道,并对其结构参数进行了优化。研究了冷却通道类型、冷却通道宽度、跨度比、冷却供气方式和转速对箔轴承热负荷性能的影响。研究表明,蜘蛛网圆形冷却通道具有更高的换热性能和更好的温度均匀性。与内缘供气方式相比,外缘供气方式更为有效。更宽的冷却通道和更小的外缘通道跨度可以大大降低润滑油气膜的最高温度。随着冷却气体雷诺数的增加,润滑气膜的最高温度和轴承载荷降低。存在一个能达到最高温度均匀性的最优雷诺数。
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来源期刊
CiteScore
4.20
自引率
5.00%
发文量
110
审稿时长
6.1 months
期刊介绍: The Journal of Engineering Tribology publishes high-quality, peer-reviewed papers from academia and industry worldwide on the engineering science associated with tribology and its applications. "I am proud to say that I have been part of the tribology research community for almost 20 years. That community has always seemed to me to be highly active, progressive, and closely knit. The conferences are well attended and are characterised by a warmth and friendliness that transcends national boundaries. I see Part J as being an important part of that community, giving us an outlet to publish and promote our scholarly activities. I very much look forward to my term of office as editor of your Journal. I hope you will continue to submit papers, help out with reviewing, and most importantly to read and talk about the work you will find there." Professor Rob Dwyer-Joyce, Sheffield University, UK This journal is a member of the Committee on Publication Ethics (COPE).
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