Effects of tip clearance on performance and characteristics of backflow in a turbopump inducer
Effects of tip clearance on performance and characteristics of backflow in a turbopump inducer
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DOI：
10.1177/0957650913499014
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发表时间：
2013-09
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通讯作者：
Semi Kim;C. Choi;Jinhan Kim;Junyoung Park;J. Baek
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文献类型：
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作者：
Semi Kim;C. Choi;Jinhan Kim;Junyoung Park;J. Baek
本文利用计算流体力学方法研究了叶顶间隙对涡轮泵诱导轮性能和流动特性的影响。针对设计和非设计条件，分析了三种不同的叶尖间隙尺寸。通过与实验结果的比较，验证了数值计算结果的正确性.我们对模拟流场的详细研究表明，对于较大的叶尖间隙，回流会渗透到更远的上游，这意味着性能会迅速下降。另一方面，对于小的叶尖间隙，回流的程度减小，但是通道中间的毂分离的发展导致性能降低。我们的研究结果证实，一个特定的值的叶尖间隙限制了发展的二次流的通道。
The objectives of the present study were to investigate the effects of tip clearance on the performance and flow characteristics of a turbopump inducer by using computational fluid dynamics. Three different tip-clearance sizes were analyzed for design and off-design conditions. The numerical results were validated by comparison with experimental results. Our detailed investigation of the simulated flow fields shows that backflow penetrates farther upstream for large-tip clearances, which means that performance declines rapidly. On the other hand, for small-tip clearances, the extent of backflow is reduced but the development of hub separation in the middle of the passage causes performance degradation. Our results confirm that a particular value of the tip-clearance limits the development of secondary flow in the passage.