Analysis of swirling flow effects on the characteristics of unsteady hot-streak migration
Analysis of swirling flow effects on the characteristics of unsteady hot-streak migration
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DOI：
10.1016/j.cja.2016.09.001
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发表时间：
2016-10
影响因子：
5.7
通讯作者：
Jingyu Wang;N. Ge;C. Sheng
中科院分区：
文献类型：
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作者：
Jingyu Wang;N. Ge;C. Sheng
燃烧室出口处的流动温度在本质上是不均匀的，这种热流体被称为热痕。采用内部CFD软件NUAA-Turbo对PW-E3单级高压涡轮进行了三维非定常数值模拟。基于实际定子数和燃烧室数的热痕效应通过界面上的收缩/膨胀方法进行了近似计算。很好地捕捉到了涡轮通道内热条纹的非定常衰减和迁移过程。热条纹不同周向位置的总体性能参数较为一致。然后，通过对比热条纹和均匀来流条件下的结果，研究了热条纹对叶片表面温度的影响。采用进口热痕和旋流相结合的非定常数值模拟结果表明，热痕中心在正涡的影响下向尖端迁移，而在负涡的影响下，热斑的核心向尖端迁移。因此，旋翼叶片的换热环境随进口涡流方向的不同而表现出很大的差异。
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-E3single-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 turbine 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 surface temperature were investigated by comparing results under hot-streak and uniform inflow conditions. 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.