流过两个串连气缸，它们之间有轻微的不对中角

IF 4 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures Pub Date : 2024-12-13 DOI:10.1016/j.marstruc.2024.103762

Qin Zhang , Xinyu Wang , Ming Zhao , Tianyuan Wang

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引用次数: 0

摘要

本文研究了两个有轻微不对准角的串联气缸的流动。与之前研究的两个平行圆柱体的流动不同，这两个圆柱体不在同一平面上，因为下游的圆柱体沿着流动方向的轴稍微旋转。在圆柱长度为100倍直径，雷诺数为100和500，间隙比为0.5、1、2和4的条件下进行了模拟。当Re=100，间隙比分别为0.5、1和2时，会出现间歇性的涡旋位错，但涡旋位错的位置在距中段15 ~ 35个直径之间。当间隙比为1和2时，由于中间位置不存在涡脱落，因此总是在中间位置发生另一次涡位错。在Re=500时，由于该位置存在涡脱落，因此未观察到中部的涡位错。两个圆柱的截面阻力系数与两个平行圆柱在相同交错距离下的截面阻力系数基本相同。两个圆柱体在靠近圆柱体中心的截面上的截面升力系数的标准导数小于两个平行圆柱体在相同交错距离下的截面升力系数的标准导数。

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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Flow past two tandem cylinders with a slight misalignment angle between them

This paper investigates the flow past two tandem cylinders with a slight misalignment angle between them. Unlike previous studies of flow past two parallel cylinders, the two cylinders are not on a same plane as the downstream cylinder is rotated slightly along an axis that is in the flow direction. Simulations are conducted for a cylinder length equal to 100 diameters, Reynolds numbers of 100 and 500 and the gap ratios of 0.5, 1, 2 and 4. If Re=100 and the gap ratio is 0.5, 1 and 2, intermittent vortex dislocation occurs, but the location of vortex dislocation varies between 15 and 35 diameters from the midsection. At gap ratios of 1 and 2, another vortex dislocation always occurs at the midsection because there is not vortex shedding at this location. This vortex dislocation at the midsection was not observed at Re=500 because there is vortex shedding at this position. The sectional drag coefficients of the two cylinders are nearly the same as those of two parallel cylinders with the same staggered distance. The standard derivation of the sectional lift coefficients of two cylinders at a section near the cylinder centres is smaller than those of two parallel cylinders with the same staggered distance.

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来源期刊

Marine Structures 工程技术-工程：海洋

CiteScore

8.70

自引率

7.70%

发文量

157

审稿时长

6.4 months

期刊介绍： This journal aims to provide a medium for presentation and discussion of the latest developments in research, design, fabrication and in-service experience relating to marine structures, i.e., all structures of steel, concrete, light alloy or composite construction having an interface with the sea, including ships, fixed and mobile offshore platforms, submarine and submersibles, pipelines, subsea systems for shallow and deep ocean operations and coastal structures such as piers.