关键词: 预旋供气系统;封严流;温降效率;熵增;掺混模型

Abstract: To find out the effects of the seal flow on temperature drop characteristics of pre-swirl air supply system， the study for the following factors on the inner seal outlet flow rate， the inner seal inlet flow rate， the inner seal inlet temperature and the inner seal inlet swirl ratio was carried out based on three-dimensional steady-state numerical simulations. The results show that under the condition that the supplied mass flow rate and pressure are constant， the seal flow out of the pre-swirl cavity has little influence on the supplied temperature， while the influence of the seal flow into the pre-swirl cavity is significant. When the inner seal inlet flow rate increases from 0 to 20% of the nozzle flow rate， the temperature drop effectiveness decreases by 31.3%. When the inner seal inlet temperature rises by 37K， the temperature drop effectiveness decreases by 29.2%. When the inner seal inlet swirl ratio increases from 0 to 0.8， the temperature drop effectiveness increases by 15.6%.

Key words: Pre-swirl air supply system;Seal flow;Temperature drop effectiveness;Entropy increment;Mixed model