利用红外热成像和CFD模拟，在一个发展中的通道流中评估了V形三角翼阵列对表面对流增强的影响。通过红外技术测量了传热表面的温度分布，通过CFD分析提供了流动结构和压降数据。V结构的灵感来源于自然界中迁徙鸟类的群体运动，旨在创造漩涡之间的建设性干扰，从而提高漩涡发生器（VG）的性能。6毫米（0.236英寸）的矩形通道高152毫米（5.984英寸）wide的设计是为了模拟单通道的平面翅片热交换器，底部有一个不透明的、均匀加热的壁，顶部有一个透明的壁。锋面风速范围为0.9至2.5 m/s（2.953至8.202 ft/s），对应于基于通道高度340至940的雷诺数范围。 对于单个小翼对，研究了三个角度，即15°、30°和45°，以确定相对于攻角的适当展开。然后将多对VG（包括两对V型阵列、串联两行对和三对V型阵列）放置在此角度进行比较。与传统的多排设计相比，所提出的V型阵列在传热方面具有优越性，尾随对的增压效应在整个雷诺数范围内是一致的。在所有研究设计中，部署在30°的两对V型阵列产生14%-32%的传热增强和最高的修正面积优度系数。因此，建议在原型平翅片热交换器中实施，尤其是与实验范围最相关的低翅片密度制冷蒸发器。引文:ASHRAE交易——第120卷第2部分，华盛顿州西雅图

The impact of a V-formation delta-winglet array on surface convection enhancement is assessed in a developing channel flow using infrared thermography and CFD simulation. Temperature distributions on the heat transfer surface are measured with the infrared technique, while the flow structure and pressure drop data are provided from CFD analysis. The Vstructure is inspired fromgroupmovement of migrating birds in nature, aiming to create constructive interference between vortices and thereby improve vortex generator (VG) performance. A rectangular channel of 6 mm (0.236 in.) high and 152 mm (5.984 in.) wide is built to model a single passage of plain-fin heat exchangers, with an opaque, uniformly heated wall on the bottom and a transparent wall on the top. The frontal air velocity ranges from 0.9 to 2.5 m/s (2.953 to 8.202 ft/s), corresponding to a Reynolds number range based on channel height of 340 to 940. For a single winglet pair, three angles, 15°, 30° and 45°, are investigated to identify an appropriate deployment with respect to the angle of attack. The multipair VGs, including a two-pair V-array, in-line two-row pairs, and a three-pairV-array, are then placed at this angle for comparison. The proposed V-array demonstrates superiority in heat transfer to the conventional multirow design and the boost effect by the trailing pair is consistent throughout the Reynolds number range. The two-pair V-array deployed at 30° yields 14%-32% heat transfer augmentation and the highest modified area goodness factor among all investigated designs. It is therefore recommended for implementation in prototype plainfin heat exchangers, particularly refrigerating evaporators of low fin density to which the experimental range is most relevant.