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Experimental and computational investigation of Reynolds number effect on the longitudinal ventilation in large enclosure of twin inclined jets

机译：雷诺数对双倾斜射流大空间纵向通风的实验和计算研究

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摘要

An experimental and computational study is presented on ventilated large enclosure using two inclined and impinging jets. Computationally, k-ε standard with a wall function treatment "enhanced wall treatment" was used to simulate the flow inside the enclosure. Experimentally, Hot Wire Anemometry and tomography laser are applied to characterize the dynamic field. Measurements have been carried out at Reynolds numbers, Re_j = (U_jD)/v (based on the nozzle hydraulic diameter D = 0.044 m, the injection velocity, U_j and the kinematic viscosity of air, v) ranging from 2 × 10~3 to 8 × 10~3. The effect of Reynolds number on the flow field and on the installation efficiency for various pitch angles and enclosure heights has been investigated. The obtained results show that the Reynolds number affects various flow properties such as the velocity decay rate, the jet spreading rate and the turbulence intensity. Analysis proved that there exists a critical value of Reynolds number (Re_(jc)). Under this value the induction coefficient, η = Q_i/Q_j (where Q_i is the induced flow and Q_j is the injected flow) increases with increasing Reynolds number. Beyond this value the jet reaches a convergence state. Results show also that the critical Reynolds number value decreases with increasing pitch angle of the jets.
机译：在通风的大型机壳上使用两个倾斜和撞击的射流进行了实验和计算研究。通过计算，使用具有“增强的墙面处理”的墙面功能处理的k-ε标准品来模拟外壳内部的流动。实验上，使用热线风速仪和断层摄影激光来表征动态场。以雷诺数Re_j =（U_jD）/ v（基于喷嘴液压直径D = 0.044 m，注射速度U_j和空气的运动粘度v）进行测量，范围为2×10〜3至8×10〜3。研究了雷诺数对不同螺距角和外壳高度的流场以及安装效率的影响。所得结果表明，雷诺数影响各种流动特性，例如速度衰减率，射流扩展率和湍流强度。分析证明存在雷诺数（Re_（jc））的临界值。在此值以下，感应系数η= Q_i / Q_j（其中Q_i是诱导流，Q_j是注入流）随雷诺数的增加而增加。超过该值，射流达到会聚状态。结果还表明，临界雷诺数值随射流桨距角的增加而减小。

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