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摘要:
为了研究涡轮转静盘腔间轮缘封严结构对下游动叶通道内流动的影响，对无封严结构、无封严气流及采用不同封严流量时涡轮动叶通道内流场分布和气动损失进行了数值模拟。结果表明：封严腔出口位置气流受静叶与动叶相对位置变化的影响呈现较强的非定常特性，变化与动叶运动周期保持一致。动叶入口位置非定常波动受到封严气流与前缘势场共同作用，封严气流引起周向、径向速度变化的同时也造成了强烈的非定常效应。动叶通道内封严气流引起的端区气流偏转改变了前缘马蹄涡滞止点位置，增强了马蹄涡压力面分支，动叶吸力面一侧剪切诱导涡改变了轮毂通道涡的形成机制和吸力面侧相对低压区的位置。
Abstract:In order to study the influence of the rim seal between the turbine wheelspace on the downstream rotor passage, numerical simulations were performed on the flow field distribution and aerodynamic loss in the turbine rotor passage when unsealed cavity, unsealed air flow and different purge flow rates were employed. The research results show that the airflow at the exit of the sealed cavity is affected by the relative position change of the stator and the rotor, showing a strong unsteady characteristic, and the change is consistent with the motion period of the rotor. The unsteady fluctuation of the inlet position of the rotor is affected by the purge flow and the leading edge potential field. The purge flow causes circumferential and radial velocity changes as well as a strong unsteady effect. The deflection of the main flow in the end wall caused by the purge flow in the rotor passage changes the stagnation point of the horseshoe vortex on the leading edge and strengthens the pressure side leg of the horseshoe vortex. The shear induced vortex on the suction side of the blade changes the formation mechanism of the hub passage vortex, and the position of the suction side relative to the low pressure area.
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Key words:
- turbine /
- rim seal /
- gas ingestion /
- purge flow injection /
- numerical simulation
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图 1 带有前后腔的1.5级涡轮子午面
Figure 1. Meridian channel of 1.5-stage turbine with front and aft seal cavity
图 4 动叶出口周向质量平均相对流动角
Figure 4. circumferential mass-averaged relative flow angle at rotor exit
图 5 IR=0.9%时相对总压系数云图
Figure 5. Contour of relative total pressure coefficient when IR=0.9%
图 6 封严腔出口径向速度与总压云图
Figure 6. Contours of radial velocity and total pressure at seal cavity exit
图 7 动叶进口相对总压Tr周期内均方差分布
Figure 7. Relative total pressure RMS in Tr cycle at rotor inlet
图 8 动叶进口时均径向速度径向分布
Figure 8. Radial distribution of time-averaged radial velocity at rotor inlet
图 9 动叶进口时均径向速度均方差径向分布
Figure 9. Radial distribution of time-averaged radial velocity RMS at rotor inlet
图 10 动叶入口周向质量平均相对流动角
Figure 10. Radial distribution of circumferential mass-averaged relative flow angle at rotor inlet
图 13 动叶前缘三维旋涡结构示意图
Figure 13. Schematic diagram of 3D vortex structure at the leading edge of blade
图 15 动叶10%叶高位置Tr周期内各时刻熵增云图
Figure 15. Contour of entropy increase at every moment of Tr cycle at 10% blade height position
图 16 动叶吸力面剪切应力与极限流线图
Figure 16. Contours of wall shear stress and limited streamlines near rotor suction side
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