Temperature and pressure ratios in gas turbines have grown over time to increase the performance and efficiency of the engine. This, in turn, has required improvements to the effectiveness of the secondary air system to enhance the cooling performance of critical components. Analysis of pressure losses in the secondary systems of aero gas turbines has identified a significant contribution in the bled airflow path through the compressor cavity between rotating disks. In this configuration, radial inflow usually occurs within an Ekman layer along the walls, while a free vortex condition appears in the cavity, generating losses and limiting transfer to the proximity of the wall. Nozzles acting as vortex reducers have shown promising performance under aeronautic conditions, although the complexity of the system limits the testing of popular theoretical models to low mass flows, based on a free vortex for a radially inward flow in a rotating cavity. For industrial applications, it is important to verify the behavior of these models at high operating points. Given that improving the performance of secondary air systems has increased in importance over time, the present study compares the one-dimensional theoretical models of Shvets and Owen with a three-dimensional Computational Fluid Dynamics (CFD) analysis verified against previous experimental values from literature. This approach allows a focus on different and more complex vortex reducer geometries while proving the usefulness of analytical techniques at high operating loads, underlying their limitations and allowing improvements to be proposed.

燃气轮机中的温度和压力比随时间增长，以提高发动机的性能和效率。反过来，这需要改善二次空气系统的有效性，以增强关键部件的冷却性能。对航空燃气轮机二次系统中的压力损失进行的分析已经确定，在通过旋转盘之间的压缩机腔的放气气流路径中，有重大贡献。在这种构造中，径向流入通常发生在沿壁的埃克曼层内，而空腔中出现自由涡旋状态，从而产生损耗并限制了向壁附近的转移。在航空条件下，充当涡流减少器的喷嘴表现出令人鼓舞的性能，尽管系统的复杂性将流行的理论模型的测试限制在低质量流量上，但是基于旋转腔中径向向内流动的自由涡流。对于工业应用，重要的是要在高工作点验证这些模型的行为。考虑到随着时间的推移，改善二次空气系统的性能的重要性日益提高，因此，本研究将Shvets和Owen的一维理论模型与三维计算流体动力学（CFD）分析进行了比较，该分析针对文献中的先前实验值进行了验证。这种方法可以专注于不同且更复杂的涡旋降低器几何形状，同时证明了分析技术在高工作负荷下的有用性，潜在的局限性并提出了改进建议。