轮盘凸肩密封结构对封严特性影响的数值研究

In order to solve the problem of the ingestion of mainstream gases into the wheel-space between the turbine rotor and stator under the externally-induced and rotationally-induced flows, which caused overheating of the turbine disk, three structures and two extended structures with rectangular slots at different positions of the radial rim seal were presented. Reynolds-Averaged Navier-Stokes (RANS) equations were utilized to investigate the influence of setting rectangular slots at different locations on the mainstream ingestion and sealing performance of five kinds of wheel shoulder seal structures. The results showed that the numerical calculations were in agreement with the experimental data, the validation of the numerical approach for the sealing effectiveness was reliable. The sealing effectiveness of three improved structures was better than the radial rim seal with different flows, and the best sealing performance was achieved by setting the rectangular slots on the side shoulder of the rotating disc. The sealing effectiveness of this structure was higher than original structure with 21% at the low sealing flow rate, and the invasion area of intrusion section was reduced by 33.8% at the high sealing flow rate. In addition, the two structures expanded based on this structure reduced the heat transfer area at the convex shoulder, but also reduced the sealing effectiveness, and the expansion was not reasonable.