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Measurement and Analysis for the Upper Side Flow Boundary Layer of a High Speed Train Using Wind Tunnel Experiments with a Scaled Model

축소모형 풍동시험을 이용한 고속열차의 유동 상부경계층 측정 및 분석

  • Received : 2015.11.05
  • Accepted : 2016.01.12
  • Published : 2016.02.29

Abstract

The flows around a high speed train are very important because they could affect the aerodynamic characteristics such as drag and acoustic noise. Especially the boundary layer of flows could represent the characteristic of flows around the high speed train. Most previous studies have focused on the boundary layer region along the train length direction for the side of the train and underbody. The measurement and analysis of the boundary layer for the roof side is also very important because it could determine the flow inlet condition for the pantograph. In this study, the roof boundary layer was measured with a 1/20 scaled model of the next generation high speed train, and the results were compared with full-scaled computational fluid dynamics results to confirm their validity. As a result, it was confirmed that the flow inlet condition for the pantograph is about 85% of the train speed. Additionally, the characteristics of the boundary layer, which increases along the train direction, was also analyzed.

Acknowledgement

Grant : 고속열차 성능 및 효율 향상 핵심기술 개발, 고속열차용 저소음/저저항 팬터그래프 공력설계 기술 및 풀스케일 팬터그래프 형상 개발

Supported by : 국토교통부

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