Air velocity and tracer gas concentration datasets of a naturally ventilated pig barn measured in a large atmospheric boundary layer wind tunnel

The experimental datasets present high resolution measurements of airflow and tracer gas concentration downwind a 1:50 scaled model of a naturally ventilated pig barn with an outdoor exercise yard. The measurements were conducted in a large atmospheric boundary wind tunnel in Germany, which simulated a moderately rough atmospheric boundary layer flow, representing a grassland or farmland terrain. Boundary layer wind profile as well as air velocity and tracer gas concentration in six measurement campaigns with different opening sizes and roof structures of the pig barn were measured in the wind tunnel. Both air velocity and gas concentration were conducted at four vertical planes including 490 measurement points in each measurement campaign. All instantaneous air velocities were measured using a two-dimensional Laser Doppler Anemometer system at a sampling number of 40,000 at each measurement point. The concentration of the tracer gas ethane was measured using a Fast Response Flame Ionisation Detector at a sampling number of 30,000. Time-averaged and instantaneous fluctuations of air velocity as well as the time-averaged gas concentration data are included in the dataset. The experimental dataset can be used for researchers and engineers for validation and refinement of computational fluid dynamics models, especially for comparing time-series turbulence statistics and transient structures. The dataset can also be used in architectural and engineering applications to evaluate and mitigate the environmental impact of the livestock buildings.本实验数据集包含带有室外运动场的自然通风式生猪舍1:50缩尺模型下风区域的气流与示踪气体（tracer gas）浓度高精度测量数据。本次测量在德国一座大型大气边界层风洞中完成，该风洞可模拟中等粗糙程度的大气边界层流，对应草地或农田地貌。本次风洞实验共开展6组测量工况，涵盖不同开口尺寸与屋顶结构的生猪舍模型，测量内容包括边界层风廓线、气流速度及示踪气体浓度。每组工况均在4个垂直平面内开展测量，每个平面包含490个测点。所有瞬时气流速度均采用二维激光多普勒测速仪（Laser Doppler Anemometer）进行测量，每个测点的采样次数为40000次。示踪气体乙烷的浓度则通过快速响应火焰离子化检测器（Fast Response Flame Ionisation Detector）进行测量，每个测点的采样次数为30000次。本数据集包含气流速度的时间平均值、瞬时脉动值，以及示踪气体浓度的时间平均值数据。本实验数据集可用于科研人员与工程师验证、优化计算流体动力学（computational fluid dynamics）模型，尤其适用于对比时序湍流统计量与瞬态结构特征。该数据集亦可应用于建筑与工程领域，用于评估并降低畜牧建筑对环境的影响。