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

摘要： 为获得封严流对预旋供气系统温降特性的影响，基于三维稳态数值模拟方法，针对内封严出气流量、内封严进气流量、内封严进气温度和内封严进气旋转比四个因素进行了研究。结果表明：在保持供气流量和供气压力一定的条件下，封严流流出预旋腔对预旋供气系统温降特性影响微小；而封严流流入预旋腔的影响显著。内封严进气流量从0增大到喷嘴流量的20%时，温降效率降低31.3%；内封严进气温度升高37K时，温降效率降低29.2%；内封严进气旋转比从0提高到0.8时，温降效率提高15.6%。

关键词: 预旋供气系统;封严流;温降效率;熵增;掺混模型