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首页> 外文期刊>International Journal of Heat and Mass Transfer >Momentum and heat transfer in a turbulent cylinder wake behind a streamwise oscillating cylinder
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Momentum and heat transfer in a turbulent cylinder wake behind a streamwise oscillating cylinder

机译：湍流缸中的动量和热传递在流式振荡缸后面唤醒

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The work aims to understand the effect of an oscillating circular cylinder on momentum and heat transport in the turbulent wake of a downstream identical cylinder, which is slightly heated. The oscillating amplitude, A, was 0.79d (d is the cylinder diameter) and the frequency was 0.17f_s for L/d = 2.5 and 0.24f_s for L/d = 4, where L and f_s are the cylinder centre-to-centre spacing and the frequency of vortex shedding from the downstream cylinder, respectively, at A = 0. The velocity and temperature fields were measured using a three-wire probe at 10d behind the stationary cylinder and a Reynolds number of 5920 based on d and the free-stream velocity. It is found that the upstream cylinder oscillation modifies the frequency of vortex shedding from the stationary cylinder, which is locked on with one harmonic of the oscillating frequency. This harmonic frequency is nearest to and below the natural vortex-shedding frequency. Furthermore, the wake response to the oscillation depends on L/d in terms of the cross-stream distributions of mean velocity, Reynolds stresses, temperature variance and heat fluxes; the turbulent Prandtl number decreases at L/d = 4 but increases at L/d = 2.5. The observations are linked to whether the flow regime experiences a change under the upstream cylinder oscillation.
机译：这项工作旨在了解振荡的圆柱体在下游相同的圆柱体的湍流中的动量和热传递的影响，该圆柱体被略微加热。振荡幅度A为0.79d（d为圆柱直径），L / d = 2.5时的频率为0.17f_s，L / d = 4时的频率为0.24f_s，其中L和f_s为圆柱的中心到中心在A = 0时，下游汽缸的涡流间距和脱落频率。在固定汽缸后10d用三线探针和基于d和自由的雷诺数5920的三线探针测量了速度和温度场。流速度。发现上游气缸振荡改变了从固定气缸脱落的涡流的频率，该固定涡流以振荡频率的一个谐波锁定。该谐波频率最接近自然涡流脱落频率并低于自然涡旋脱落频率。此外，对振荡的唤醒响应在平均速度，雷诺应力，温度变化和热通量的横流分布方面取决于L / d。湍流普朗特数在L / d = 4时减小，但在L / d = 2.5时增加。这些观察与流态是否在上游气缸振荡下发生变化有关。

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