Aerodynamic Drag Reduction and Insulation Performance of Roof Insulator with Dimpled Non-smooth Surfaces

Yujun Guo; Chenguang Yang; Libin Yao; Kai Liu; Xueqin Zhang; Song Xiao; Wenfu Wei; Guangning Wu

doi:10.17775/CSEEJPES.2022.04340

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Aerodynamic Drag Reduction and Insulation Performance of Roof Insulator with Dimpled Non-smooth Surfaces

Regular Papers | 更新时间：2026-10-10

- Aerodynamic Drag Reduction and Insulation Performance of Roof Insulator with Dimpled Non-smooth Surfaces
- Aerodynamic Drag Reduction and Insulation Performance of Roof Insulator with Dimpled Non-smooth Surfaces
- 中国电机工程学会电力与能源系统学报(英文) 2026年12卷第5期页码：2594-2604
- 作者机构：
  
  1. School of Electrical Engineering, Southwest Jiaotong University,Chengdu,China
  2. Railway Traction Power Supply Safety and Security Technology Innovation Team,Sichuan,China
- 作者简介：
- 基金信息：
- DOI：10.17775/CSEEJPES.2022.04340
  中图分类号：
- 纸质出版：2026-09-01
- 稿件说明：
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Yujun Guo, Chenguang Yang, Libin Yao, 等. Aerodynamic Drag Reduction and Insulation Performance of Roof Insulator with Dimpled Non-smooth Surfaces[J]. 中国电机工程学会电力与能源系统学报(英文), 2026,12(5):2594-2604.

Yujun Guo, Chenguang Yang, Libin Yao, et al. Aerodynamic Drag Reduction and Insulation Performance of Roof Insulator with Dimpled Non-smooth Surfaces[J]. CSEE Journal of Power and Energy Systems, 2026, 12(5): 2594-2604.
Yujun Guo, Chenguang Yang, Libin Yao, 等. Aerodynamic Drag Reduction and Insulation Performance of Roof Insulator with Dimpled Non-smooth Surfaces[J]. 中国电机工程学会电力与能源系统学报(英文), 2026,12(5):2594-2604. DOI： 10.17775/CSEEJPES.2022.04340.

Yujun Guo, Chenguang Yang, Libin Yao, et al. Aerodynamic Drag Reduction and Insulation Performance of Roof Insulator with Dimpled Non-smooth Surfaces[J]. CSEE Journal of Power and Energy Systems, 2026, 12(5): 2594-2604. DOI： 10.17775/CSEEJPES.2022.04340.

摘要

Abstract

Aerodynamic drag generated by high-speed trains significantly affects trains' operating cost and restricts a further increase in speed. Currently

the drag reduction method with streamlined bodies has reached its limit. The presence of external insulation equipment disrupts the roof's smoothness

making it an important source of aerodynamic drag. However

roof equipment also assumes an essential role of electrical insulation

so both aerodynamic characteristics and insulation performance need to be considered. Therefore

a drag reduction method based on the non-smooth structure is proposed for the roof insulator

in which aerodynamic characteristics on and around the insulator are changed by constructing dimpled surfaces on the sheds. In this study

parameters of dimple structure with an excellent drag reduction effect were determined

achieving a drag reduction rate of 17.51%. Simulations and experiments were conducted to verify that the dimpled insulator exhibits good electrical insulation performance. Finally

a mechanism analysis of drag reduction with a dimpled structure was provided in terms of velocity vector

turbulent kinetic energy and turbulent dissipation rate. This study provides guidance for drag reduction of external insulation equipment and energy savings of high-speed trains.

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