Analysis of swirling flow effects on the characteristics of unsteady hot-streak migration |
| |
Institution: | 1. Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;2. The University of Toledo, 0H 43606, USA |
| |
Abstract: | The temperature of flow at the combustor exit is inherently non-uniform and the hot fluid is called hot-streak. An in-house CFD software, NUAA-Turbo, was used to carry out 3D unsteady simulations on the PW-E3 single-stage high-pressure turbine. The hot-streak effect based on real stator and combustor counts was approximately evaluated by the contraction/dilatation method on the interface. The unsteady attenuation and migration process of hot-streaks in the tur-bine passage were well captured. The general performance parameters for different circumferential positions of hot-streaks were relatively consistent. Then, the influences of hot-streaks on blade sur-face temperature were investigated by comparing results under hot-streak and uniform inflow con-ditions. Unsteady simulations with combined inlet hot-streak and swirling flow show that the core of a hot-streak migrates to the tip under the influence of a positive swirl, while the phenomenon is just opposite with a negative swirl. Therefore, the heat transfer environment of rotor blades shows great differences with different directions of inlet swirl. |
| |
Keywords: | High pressure turbine Hot-streak Interface contraction/dilata-tion Swirling flow Unsteady flow |
本文献已被 CNKI 万方数据 等数据库收录! |
|