轮缘封严气流与主流干涉的损失机理研究

In order to investigate the interaction loss mechanisms between turbine stator-rotor cavity rim seal flow and mainstream, investigations were conducted on the loss factors and isolation method for interaction between the rim seal flow and mainstream for the case with and without the rim seal flow. The results show that four loss factors are considered, namely viscous shear loss, blockage effect loss, secondary flow interaction loss and second stator additional loss. Among these four loss factors, the percent of viscous shear loss is 67.68% at design condition. In addition, the percent of other three loss factors approaches each other. With the increment of rim seal flow rate, the mass flow rate and radial velocity of egress flow increase and the circumferential velocity of egress flow reduces, which leads four losses to increase. Relative to the design condition, the total loss increases by approximately 104.25% per 1% increase in the rim seal flow rate. Furthermore, the established loss quantitative system exactly captures the increasing trend of blockage effect loss in rotor domain and secondary flow interaction loss. Therefore, the loss quantitative system is further proven to be feasible and effective.