Research on the thermal characteristics and structural optimization of oil-immersed transformer based on natural convection cooling in extreme environment

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer Pub Date : 2025-05-09 DOI:10.1016/j.icheatmasstransfer.2025.109038

Ye Wang , Yang Cheng , Yagang Wang , Yao Song , Delong Huang

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引用次数: 0

Abstract

Effective thermal management is critical for oil-immersed transformers to mitigate insulation degradation and ensure reliability under extreme conditions. This study focuses on optimizing the raised structure parameters on the top and bottom inner walls of a 200 kVA transformer to enhance natural convection cooling. Employing the response surface methodology with the average Nusselt number as the objective function, we optimized key parameters—raised structure height, lateral spacing, longitudinal spacing, and oil flow attack angle. Detailed analysis of the conical raised structure highlights its ability to disrupt the boundary layer, strengthening the coupling between the internal flow and temperature fields of the insulating oil. The optimized design reduces the hot spot temperature by 8.17 K and increases the average Nusselt number by 14.3 %, significantly improving heat transfer efficiency. These findings offer valuable engineering insights for enhancing transformer performance and longevity in harsh environments.

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极端环境下基于自然对流冷却的油浸式变压器热特性及结构优化研究

有效的热管理对油浸式变压器至关重要，以减轻绝缘退化，确保在极端条件下的可靠性。本研究主要对200kva变压器上下内壁凸起结构参数进行优化，以增强自然对流冷却。采用响应面法，以平均努塞尔数为目标函数，对凸起结构高度、横向间距、纵向间距、油流攻角等关键参数进行优化。通过对锥形凸起结构的详细分析，突出了其破坏边界层的能力，加强了绝缘油内部流动场和温度场之间的耦合。优化后的热区温度降低了8.17 K，平均努塞尔数提高了14.3%，显著提高了换热效率。这些发现为提高恶劣环境下变压器的性能和寿命提供了有价值的工程见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Communications in Heat and Mass Transfer 工程技术-力学

CiteScore

11.00

自引率

10.00%

发文量

648

审稿时长

32 days

期刊介绍： International Communications in Heat and Mass Transfer serves as a world forum for the rapid dissemination of new ideas, new measurement techniques, preliminary findings of ongoing investigations, discussions, and criticisms in the field of heat and mass transfer. Two types of manuscript will be considered for publication: communications (short reports of new work or discussions of work which has already been published) and summaries (abstracts of reports, theses or manuscripts which are too long for publication in full). Together with its companion publication, International Journal of Heat and Mass Transfer, with which it shares the same Board of Editors, this journal is read by research workers and engineers throughout the world.