考虑粗糙表面接触间隙传热效应的指形密封分形热流特性研究

Fractals Pub Date : 2024-02-28 DOI:10.1142/s0218348x24500385
JUNJIE LEI, MEIHONG LIU
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引用次数: 0

摘要

指形密封是一种新型柔性动态密封技术,其传热特性和渗流特性是主要研究热点之一。本文基于分形理论,建立了考虑粗糙表面接触间隙传热效应的指形密封总热导率分形模型,建立了考虑气体滑移效应和温度变化的相邻指形密封环面有效气体渗透率分形模型,并提出了指形密封双向热机耦合有限元计算方法。结果表明,固相热导率随尺度系数的增大而减小。当轴向压差大于 0.4MPa、转子转速大于 11000r/min、径向位移激励为 [0.03mm, 0.09mm]、温度小于 600K 时,指形密封件与转子之间的气相导热系数呈上升趋势。在不同工况下,指形密封圈与转子的气相导热系数始终处于主要位置。在不同的分形尺寸下,固相热传导逐渐占据主导地位。温度对有效气体渗透率有一定影响,而分形尺寸、比例系数和轴向压差对有效气体渗透率的影响较小。在轴向压差为 0.08MPa 时,指形密封双向热机械耦合计算方法的数值计算结果与实验结果较为接近,最大误差率为 1.96%。上述结果进一步完善了指形密封传热特性的理论研究体系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
RESEARCH ON FRACTAL HEAT FLOW CHARACTERIZATION OF FINGER SEAL CONSIDERING THE HEAT TRANSFER EFFECT OF CONTACT GAPS ON ROUGH SURFACES

Finger seal is a new flexible dynamic sealing technology, and its heat transfer characteristics and seepage characteristics are one of the main research hotspots. In this paper, based on the fractal theory, a fractal model of the total thermal conductance of the finger seal considering the heat transfer effect of the contact gap of the rough surface is established, a fractal model of the effective gas permeability of the adjacent finger seals annulus considering the gas slip effect and the temperature change is established, and a finite element calculation method of the two-way thermo-mechanical coupling for the finger seal is proposed. The results show that the solid-phase thermal conductance decreases with the increase of the scale coefficient. When the axial pressure difference is greater than 0.4MPa, the rotor speed is greater than 11,000r/min, the radial displacement excitation is [0.03mm, 0.09mm], and the temperature is less than 600K, the gas-phase thermal conductance between the finger seal and the rotor shows an increasing trend. The gas-phase thermal conductance of the finger seal and the rotor is always the main position under different working conditions. Under different fractal dimensions, the solid-phase thermal conductance gradually occupies the dominant position. Temperature has a certain effect on the effective gas permeability, and fractal dimension, scale coefficient, and axial pressure difference have less effect on the effective gas permeability. At an axial pressure difference of 0.08MPa, the numerical calculation results of the two-way thermo-mechanical coupling calculation method for finger seal are closer to the experimental results, with a maximum error rate of 1.96%. The above results further improve the theoretical research system of the heat transfer characteristics of the finger seal.

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