A Study on Vehicle Drag Coefficients in Domestic Rord Tunnels

Drag coefficient is one of the critical design factors to quantify the piston effect in vehicle tunnels. Several problems are raised on the drag coefficient currently applied for the ventilation system design; unverified adoption of the projected frontal area of the vehicle from the foreign study in the past, and lack of consideration for the slip-streaming effect. This study aims at better estimation of the traffic-induced ventilation force in the local tunnels. Values for the projected frontal area of the vehicles running on the local roads at present are proposed and results of an extensive CFD study are studied on the slip-streaming effects in various traffic conditions to quantify Kblockage and the drag coefficient in the domestic tunnels.

keywords: Piston effect, drag coefficient, streaming effect, blockage ratio, 교통환기력, 항력계수, 슬립스트리밍효과, 페색율, Piston effect, drag coefficient, streaming effect, blockage ratio

Reference

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Article Contents

Vol.7 No.4

A Study on Vehicle Drag Coefficients in Domestic Rord Tunnels

Abstract

Reference

(사)한국터널지하공간학회