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为了寻求更好的叶片前缘内冷结构,对旋流冲击和常规冲击的流动和传热特性进行了数值模拟,对比研究了二者的涡流结构、传热强度、流动阻力、综合传热性能和热均匀性,研究了通道Re数和冲击间距对这些参数的影响。结果表明旋流冲击形成的旋涡有利于传热的增强和热均匀性的提高。在所研究的Re数(2×104~7.78×104)和冲击间距(3.3~5倍直径)范围内,旋流冲击与常规冲击相比平均传热增强18%~34%,增幅随Re数和冲击间距的增大而增大;流阻增大10%~26%,增幅随Re数和冲击间距的增大而减小;综合传热性能增强20%左右;热均匀性提高60%左右。
In order to find a better blade internal cooling structure, the numerical simulation of the flow and heat transfer characteristics of the cyclone impact and the conventional impact is carried out. The eddy structure, heat transfer strength, flow resistance, heat transfer performance And thermal uniformity, the effect of channel Re number and impact spacing on these parameters was studied. The results show that the vortex formed by the swirling flow is conducive to heat transfer enhancement and thermal uniformity enhancement. In the range of Re (2 × 104 ~ 7.78 × 104) and impact distance (3.3 ~ 5 times diameter) studied, the average heat transfer increases by 18% ~ 34% compared with the conventional impact, And the impact distance increases, the flow resistance increases by 10% ~ 26%, the increase decreases with the increase of Re number and impact spacing, the overall heat transfer performance increases by about 20%, and the thermal uniformity increases by about 60% .