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摘要： 对供热制冷系统管段内弯头和三通近距离的流动情况建立了实验模型。采用PIV对实验模型内部的流动进行分析，用Fluent软件SST模型对管道内的流动进行数值计算，并对比分析了PIV与CFD的计算结果。根据实验提出了4种改进方案，并用Fluent软件对不同方案的各种连接方式进行了数值计算分析，给出了局部阻力系数变化曲线。为供热制冷系统管网的阻力平衡计算提供了科学依据。 关键词： 供热管网 弯头 T形三通 近距离耦合 粒子图像测速技术(PIV) CFD 流动阻力 Experiments on the pressure loss coefficient of pipe sections around elbow and tee junction By Li Angui★, Zhang Xinji, He Sifeng, Zhang Yongqi and Li Bo Abstract Establishes the experimental model, analyses the fluid flow with PIV technique and calculates with the SST turbulent model. According to the comparison results, proposes four improving types of junctions, and by simulation with the Fluent software gives the local resistance coefficient curve, providing a rational basis for the pipe network resistance balance calculation. Keywords heating network, elbow, T-junction, close coupled, particle image velocimetry, computational fluid dynamics, flow resistance ★ Xian University of Architecture and Technology, Xian, China