Effect of inlet flow ratio on heat transfer characteristics of a novel twin-web turbine disk with receiving holes

Abstract

A new type of twin-web turbine disk (TWD) with receiving holes was designed and the corresponding simulation model was established. The effects of the inlet flow ratio of nozzle 1 to center inlet ( P 1 ) and the flow ratio of nozzle 1 to nozzle 2 ( P 2 ) on the heat transfer characteristics of the system were investigated. The RNG k-ε turbulence model was adopted as the simulation model. Maximum disk temperature ( T max ), the axial and radial temperature uniformity of the turbine disk were used as evaluation indexes. The results showed that T max was the lowest and both the axial and radial temperature uniformity were relatively good when P 1 approached infinity. The effect of P 2 on the heat transfer characteristics of the TWD with receiving holes was investigated by keeping P 1 tending to infinity. Considering comprehensively, when P 2 was equal to 2–3, T max , radial and axial temperature uniformity were relatively good. Compared with the previous optimization results of a traditional TWD done by our group, T max was 8.5 K lower and the maximum axial temperature difference was 4 K lower for the novel TWD. The radial temperature uniformity of the TWD with receiving holes was also better than that of the traditional TWD.