轮缘密封布置对转静系内主流入侵的影响（英文）

Effect of the Rim Seal Configurations on the Hot Gas Ingestion into the Rotor-stator Cavity

本文中利用气热耦合的数值方法对不同轮缘密封结构下的涡轮盘腔内部的流动和传热特性开展数值研究。高半径位置处的径向间隙可以不但可以封锁主流入侵同时可以防止扫吹流直接进入主流通道。与简单的轴向间隙轮缘密封相比径向间隙的轮缘结构可以改善涡轮盘固体的温度场分布,并将封严效率提高约3%~10%。轴-径间隙轮缘密封保持了径向间隙的优势,并进一步减小了主流入侵对转静轮盘温度分布的负面影响。在轴-径间隙轮缘密封最小封严流量条件下,与轴向间隙轮缘密封对比,封严效率提高5.29%,气动效率提高1.8%。

The effect of rim seal configurations on the flow and heat transfer characteristics in a turbine cavity and the rim seal clearance flow are computed by using a numerical method for conjugate heat transfer. A radial clearance at high radius can properly block the ingestion air and purge flow into the rim clearance region, leading to a better temperature distribution of the turbine disc and cavity with approximately 3%-10% increase in seal effectiveness when compared to an axial clearance rim seal at high radius. The radial-axial clearance rim seal keeps the advantages of a radial-clearance, further reducing the negative effect of ingestion gas on the temperature of the rotor and stator discs. Under the condition of minimum sealant flow rate for the radial-axial clearance rim seal, the seal effectiveness of the radial-axial clearance rim seal is 5.29 % higher than that of the axial-clearance rim seal, and the air-cooling aerodynamic efficiency of the radial-axial clearance rim seal is 1.8 % higher than that of the axial-clearance.