In this study, Kagome lattice structure (KLS) produced by 3D printer is used as a turbulator for a typical rectangular internal cooling channel at the trailing edge of turbine blade. The friction factor and bottom wall heat transfer coefficient of the channel filled with low thermal conductivity ABS plastic KLS are experimentally and numerically analyzed by changing the column diameter d/H = 0.1–0.2, the inclination angle α = 45°-60° and included angle β = 120°-150° under the Reynolds number range of 5000–30,000. The fitting correlations of these parameters with the channel friction factors and the average Nusselt number of working surface are obtained. The results show that when Reynolds number increases from 5000 to 30,000, the vortex range behind type II column increases obviously, the local heat transfer effect is obviously improved and the comprehensive impact factor F increases by 180%. When d/H increases from 0.1 to 0.2, the area of stagnation vortex after type I column expands, the heat transfer effect improves significantly, the friction factor increases by 60.9%, the average Nusselt number of channel wall increases by 32.2%, and the F increases by 16%. With the increase of α and β, the heat transfer effect has no obvious change, but the friction factor in the channel is reduced with different degrees. The high heat transfer area is mainly concentrated near the surface of the column. In the obtained fitting correlation, the maximum error of the average Nusselt number is 9.3%, and the maximum error of friction factor is 24%.

在这项研究中，3D 打印机生产的 Kagome 晶格结构 (KLS) 被用作涡轮叶片后缘典型矩形内部冷却通道的湍流器。通过改变柱径d/H  =0.1-0.2，倾角α  =45°-60° ，对填充低导热ABS塑料KLS的通道的摩擦系数和底壁传热系数进行实验和数值分析。角β = 120°-150° 在雷诺数范围 5000-30,000 下。得到这些参数与通道摩擦系数和工作面平均努塞尔数的拟合关系。结果表明，当雷诺数从5000增加到30000时，II型柱后涡范围明显增大，局部传热效果明显改善，综合影响因子F提高180%。当d/H从0.1增加到0.2时，I型柱后滞流涡面积扩大，传热效果显着提高，摩擦因数增加60.9%，通道壁平均努塞尔数增加32.2%，F增加 16%。随着α的增加和β，传热效果没有明显的变化，但是在通道中的摩擦系数有不同程度的降低。高传热区主要集中在柱体表面附近。在得到的拟合相关性中，平均努塞尔数的最大误差为9.3%，摩擦系数的最大误差为24%。