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首页> 外文会议>ERCOFTAC International Symposium on Engineering Turbulence Modelling and Measurements(ETMM6); 20050523-25; Sardinia(IT) >STUDY OF THE EFFECT OF FLOW PULSATION ON THE FLOW FIELD AND HEAT TRANSFER OVER AN INLINE CYLINDER ARRAY USING LES
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STUDY OF THE EFFECT OF FLOW PULSATION ON THE FLOW FIELD AND HEAT TRANSFER OVER AN INLINE CYLINDER ARRAY USING LES

机译：用LES研究流脉动对直列圆柱阵列内流场和传热的影响。

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This paper aims to study the effect of pulsating approaching flow, u(t) = u_∞ + Δu / 2 • sin(2πf_pt) on the flow field and convective heat transfer over an inline cylinder array at a sub-critical Reynolds number Re_(d,g)= 3,400 (based on cylinder diameter and the gap velocity across the minimum section) using the Large Eddy Simulation (LES) technique. The LES computational results (mean and rms velocities) are directly compared with the LDA measurements of Konstantinidis et al. (2000) and good agreement is obtained. For steady approaching flow, a single mode of alternate vortex shedding with a constant Strouhal number (around 0.145) is observed behind all central cylinders. Flow pulsation at a frequency around twice the natural vortex shedding frequency (St_p = f_pD/u_(gap) = 0.28) affects the cylinder wake by reducing the recirculation bubble size behind the first row cylinder and increasing the transverse mixing. In agreement with Konstantinidis et al. (2003), when the external pulsation frequency is around three times the natural vortex shedding frequency (St_p=0.45), a symmetrical vortex formation mode is predicted successfully by LES. The heat transfer rate in the front part of the second row cylinder is greatly enhanced due to the vortex shedding lock-on behind the first cylinder. LES computations of six-row cylinders demonstrated that heat transfer around the third row and downstream cylinders are not influenced much by the external pulsation.
机译：本文旨在研究亚临界雷诺数Re_（）下脉动接近流u（t）=u_∞+Δu/ 2•sin（2πf_pt）对在线圆柱阵列上流场和对流传热的影响。 d，g）= 3,400（基于圆柱直径和最小截面上的间隙速度），使用大涡模拟（LES）技术。 LES的计算结果（均值和均方根速度）直接与Konstantinidis等人的LDA测量值进行比较。 （2000年），并获得良好的协议。对于稳定的进场流量，在所有中心圆柱体后部观察到具有恒定Strouhal数（约0.145）的交替涡旋脱落的单一模式。流量脉动的频率大约是自然涡流脱落频率（St_p = f_pD / u_（gap）= 0.28）的两倍，它通过减小第一排圆柱体后面的再循环气泡尺寸并增加横向混合来影响圆柱体尾流。与Konstantinidis等人达成协议。 （2003年），当外部脉动频率约为自然涡旋脱落频率的三倍（St_p = 0.45）时，LES成功地预测出对称涡旋形成模式。由于第一缸后面的涡流脱落锁定，大大提高了第二排缸前部的传热率。 LES对六排圆柱的计算表明，第三排圆柱和下游圆柱的传热不受外部脉动的影响很大。

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