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首页> 外文期刊>Transactions of the ASABE >Design, construction, and calibration of a portable boundary layer wind tunnel for field use.
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Design, construction, and calibration of a portable boundary layer wind tunnel for field use.

机译：现场使用的便携式边界层风洞的设计，构造和校准。

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摘要

Wind erosion is a natural process that has formed landscapes but threatens sustainable agriculture in many locations. Wind tunnels have been used for several decades to study wind erosion processes. Portable wind tunnels offer the advantage of testing natural surfaces in the field, but they must be carefully designed to ensure that a logarithmic boundary layer is formed and that wind erosion processes may develop without interference from the tunnel structures. Although large portable tunnels often meet the aerodynamic criteria, their size and transportation requirements often limit the locations where they may be employed. We designed and built a self-contained portable wind tunnel that is easily transported on a tandem-axle trailer and pulled with a pickup truck. The wind tunnel uses a centrifugal blower, a flow-conditioning section with optional abrader material feed, and a 1 m tall and 0.5 m wide working section that can vary in length from 2 m to 6 m. The maximum wind velocity attainable is 18.7 m s-1 although a mid-height centerline velocity of 12.6 m s-1 is normally used for field testing of natural surfaces. Based on measured wind velocity profiles in the tunnel working section, a conservative estimate of boundary layer depth within the working section is 0.5 m. Even though no wind tunnel can truly duplicate the scale and variability of the forces that drive wind erosion, tunnels such as this one with deeply developed boundary layers offer reasonable estimates of dust emissions and erodibilities of natural surfaces. This wind tunnel has been used to test rangeland and cropped surfaces in several locations and has provided reliable and useable soil erodibility and dust emission data.
机译：风蚀是形成景观的自然过程，但在许多地方威胁着可持续农业。风洞已经被用来研究风蚀过程数十年了。便携式风洞具有在野外测试自然表面的优势，但必须仔细设计以确保形成对数边界层，并且可以在不受隧道结构干扰的情况下发展风蚀过程。尽管大型便携式隧道通常符合空气动力学标准，但其尺寸和运输要求经常会限制其使用位置。我们设计并建造了一个设备齐全的便携式风洞，该风洞很容易在串联桥式拖车上运输并用皮卡车拉动。风洞使用离心鼓风机，带有可选研磨剂进料的流量调节部分以及1m高，0.5m宽的工作段，工作段的长度从2 m到6 m不等。尽管通常将12.6 m s -1 的中高中心线速度用于自然表面的现场测试，但可获得的最大风速为18.7 m s -1 。根据隧道工作段内测得的风速分布，工作段内边界层深度的保守估计为0.5 m。即使没有风洞能够真正复制造成风蚀的力的大小和变化性，但像这样的具有深厚边界层的风洞可以合理地估算出粉尘排放和自然表面的易蚀性。该风洞已用于在多个位置测试牧场和农作物表面，并提供了可靠且可用的土壤侵蚀性和粉尘排放数据。

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