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자료유형
학술대회자료
저자정보
저널정보
한국유체기계학회 한국유체기계학회 학술대회 논문집 유체기계공업학회 제4회 한국유체공학학술대회 논문집 (제2권)
발행연도
2006.8
수록면
797 - 800 (4page)

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초록· 키워드

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Quantifying the drag forces exerted by vehicles is critical for road tunnel ventilation safety design due to the high ratios they account for. Vehicle-induced forces occupy as much as 32~100% of the total ventilation forces acting inside tunnel, while in safety design, drag forces is in the range of 28 to 65% of the mechanical pressure required for the emergency fan. The method adopted in local design guidelines for determining the drag coefficient does not take into account the effects of slip streaming despite of the recommendation by PIARC. This paper aims at analyzing the effects of slip streaming on drag coefficient by varying vehicle type, blockage ratio, inter-vehicle distance and relative air velocity.
A total of 192 cases in 4 different target tunnels with 4 levels of service, 2 types of vehicle, 6 different relative air velocities were numerically studied with SOLVENT. Some of the significant results can be summarized as follows:
(1) If the inter-vehicle distance is kept constant, drag coefficient remains almost constant with relative air velocity of 5.0~28.3㎧.
(2) Effects of slip streaming become more prominent, as traffic density increases and inter-vehicle distance gets shorter. Reduction of drag coefficient reaches 23~39%. However, differences in reduction ratios are not significant among the different vehicle types .
(3) In the case of heavy vehicles, reduction in drag coefficient due to decreasing inter-vehicle distance shows linear relationship, while the relationship is not statistically significant for small vehicles.
(4) Drag coefficient of small vehicles noticeably increases with higher blockage ratio under the relative air velocity of 5.0~28.3㎧ and the blockage ratio of 1.8~3.6%. However, the trend in heavy vehicles is not consistent, as drag coefficient increases up to the blockage ratio of 7.% and unexpectedly decreases thereafter.
(5) The drag coefficient suggested by current local guidelines must be interpreted as its upper limit, and the suggested method for coefficient derivation should be reappraised.

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Abstract
1. 서론
2. 차향항력 계산방법 및 관련 설계기준
3. 슬립 스트리밍 효과 분석
4. 결론
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UCI(KEPA) : I410-ECN-0101-2010-554-002111653