为了充分理解与掌握实际工程中盘腔多腔室流动特性，以实际船用燃气轮机低压盘腔系统为研究对象，基于ANSYS CFX软件，采用SST k-ω湍流模型开展数值模拟，对比分析了船用燃气轮机低压盘腔系统在不同工况下的流动特性。研究表明：在各支路流量分配中，随着雷诺数增加，接受孔流量先波动后持续增大，平衡孔流量逐渐减小；在气体预旋比分布中，对于腔体C3，C4，C5，随着雷诺数增加，气体预旋比逐渐减小；对于涡系结构，C4和C5盘腔涡系结构基本保持稳定；预旋喷嘴出口和接受孔进口之间的总压差随着雷诺数增加呈现指数增长趋势，总温差随着雷诺数增加先增大后减小。

To fully understand and master the flow characteristics of multichamber in the actual engineering,the actual marine gas turbine lowpressure disk cavity system was taken as the research object. The SST k-ω turbulence model was used to carry out numerical simulation based on ANSYS CFX software. The flow characteristics of marine gas turbine lowpressure disk cavity system under different working conditions were compared and analyzed. The results show that in the flow distribution of each branch,with the increase of Reynolds number,the flow at the receiving hole fluctuates first and then increases continuously,while the flow at the equilibrium hole decreases gradually. In the distribution of gas core swirl ratio K,the K value gradually decreases with the increase of Reynolds number for cavities C3,C4 and C5. For the vortex system structure,the C4 and C5 disk cavity vortex system structure is basically stable. The total pressure difference between the outlet of preswirl nozzle and the inlet of receiving hole increases exponentially with the increase of Reynolds number,and the total temperature difference increases first and then decreases with the increase of Reynolds number.

TK221

中船集团自立科技项目（202109Z）；黑龙江省自然科学基金（TD2021E001）