Effect of end-clearance sealed structure of guide vane on variable nozzle turbine performance
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摘要:
基于传统可调涡轮导叶，设计了一种带有端隙密封结构的喷嘴环导叶（end-clearance sealed guide vane, ESGV）。在导叶不同开度下，对ESGV可调涡轮进行数值模拟，分析了ESGV对可调涡轮性能的影响，结果表明：ESGV可以有效的抑制导叶端隙泄漏流，能够明显改善喷嘴环和转子通道的流动状态，进而提高涡轮效率。对ESGV可调涡轮和原始涡轮进行涡轮特性试验，结果显示：两型涡轮流量特性大致相同时，在导叶中开度下，ESGV涡轮效率较原始涡轮提高了5%，验证了ESGV方案的有效性。
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关键词:
- 带有端隙密封结构的喷嘴环导叶（ESGV） /
- 可调径向涡轮 /
- 间隙泄漏流 /
- 涡轮性能 /
- 泄漏损失
Abstract:Based on the traditional variable nozzle turbine guide vane, an end-clearance sealed guide vane (ESGV) was designed. The effect of ESGV on the performance of the turbine was analyzed by numerical simulation under different guide openings. The results showed that ESGV can effectively suppress the end-wall clearance leakage flow of the guide vane and improve the flow state of nozzle ring and rotor channel, and then enhance the turbine efficiency. Finally, the turbine performance tests of the ESGV turbine and the prototype turbine were carried out. The results showed that, when the flow characteristic curves of the two turbines were roughly the same, the efficiency of the ESGV turbine was 5% higher than that of the prototype turbine at the medium opening.
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图 3 原涡轮特性试验与数值计算结果对比
Figure 3. Comparison of the experimental and CFD performance of the original turbine
图 4 ESGV涡轮与原始涡轮特性对比
Figure 4. Performance comparison of the original and ESGV turbines
图 5 ESGV涡轮轮毂侧圆盘间隙静压分布
Figure 5. Static pressure distribution of disc clearance at the hub side of the ESGV turbine
图 6 两型涡轮导叶相对泄漏量对比
Figure 6. Relative leakage flow comparison between original turbine and ESGV turbine
图 7 小开度两型涡轮导叶不同叶高位置熵值分布
Figure 7. Entropy distribution of nozzle at different vane height for two turbines
图 8 两型涡轮导叶出口总压损失系数
Figure 8. Total pressure loss coefficient at guide vane outlet for two turbines
图 10 两型涡轮转子不同叶高处熵值分布
Figure 10. Entropy distribution at different rotor blade height for two turbines
图 11 小开度下两型涡轮导叶间隙泄露流线
Figure 11. Streamline distribution of end-wall clearance leakage of guide vane at small opening for the two models
图 14 两型涡轮特性曲线
Figure 14. Experimental characteristic map of the ESGV turbine compared to the original turbine
表 1 原始导叶与ESGV主要参数
Table 1. Main parameters for the original guide vane and ESGV
参数 数值 参数 数值 原始导叶 叶片数量 10 ESGV 叶高/mm 6.77 轮缘面端面间隙/mm 0.15 圆盘直径/mm 19.8 轮毂面端面间隙/mm 0.15 圆盘厚度/mm 2 弦长/mm 19 圆盘凹槽直径/mm 17.8 导叶高度/mm 6.47 圆盘凹槽深度/mm 0.5 
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表 2 网格信息
Table 2. Mesh quality information
模型 节点数 延展比 正交比 长宽比 转子 688848 2.81 18.5 462 导叶 406386 2.08 31.8 242 圆盘 436810 10.7 38.1 825
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