Flow analysis and performance improvement of a radial inflow turbine with back cavity under variable operation condition of compressed air energy storage
Flow analysis and performance improvement of a radial inflow turbine with back cavity under variable operation condition of compressed air energy storage
复制标题
压缩空气储能变工况下后腔径流式涡轮流动分析及性能改进
DOI：
10.1002/er.4425
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发表时间：
2019-04
影响因子：
4.6
通讯作者：
Haisheng Chen
中科院分区：
文献类型：
--
作者：
Xing Wang;Wen Li;Xuehui Zhang;Yangli Zhu;Haisheng Chen
径流式涡轮机是压缩空气蓄能系统中重要的功输出装置。它对系统的效率有很大的影响。然而，在CAES系统变工况条件下，背腔泄漏流对径向开式转子流动损失的影响仍需进一步研究。因此，本文揭示了不同总膨胀比下背腔径流式涡轮机的性能。结果表明，原背腔迷宫密封间隙的变化对泄漏流量和等熵效率的影响有限。当迷宫密封尺寸在0.09 ~ 0.20 mm范围内变化时，等熵效率仅降低0.11%，泄漏流量仅增加0.017 kg/s，后腔流体有向转子通道泄漏的倾向，造成较大的流动损失;因此降低了不同总膨胀比下的等熵效率，当总膨胀比为2.89时，等熵效率降低最大，为1.5%。为了控制流动损失，提出了一种“转子背腔密封”，当总膨胀比为2.89时，获得了1.12%的最大等熵效率增量。
Radial inflow turbine is an important working output device in compressed air energy storage (CAES) system. It influences the system's efficiency significantly. However, the investigation about effect of back cavity leakage flow on flow loss in radial unshrouded rotor is still needed, especially under variable operation condition of CAES system. Therefore, the performance of radial turbine with back cavity at different total expansion ratio is revealed in the present work. Results illustrate that the variation of labyrinth seal clearance in the original back cavity has limited impact on the leakage flow and the isentropic efficiency. The isentropic efficiency only reduced by 0.11%, and the leakage flow rate is only increased by 0.017 kg/s when labyrinth seal size varies from 0.09 to 0.20 mm. The fluid in back cavity intends to leak into the rotor channel and causes more flow loss; the isentropic efficiency under different total expansion ratio is thus decreased, and a maximum isentropic efficiency reduction of 1.5% is obtained when total expansion ratio is 2.89. To control the flow loss, a “rotor‐back cavity seal” is proposed, and a maximum isentropic efficiency increment of 1.12% is achieved when total expansion ratio is 2.89.
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影响因子：
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作者：
Gaoliang Liao;Xinjun Wang;Jun Li;Junfei Zhou
通讯作者：
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DOI：
10.2514/6.1990-2414
发表时间：
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期刊：
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影响因子：
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作者：
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DOI：
10.1016/j.egypro.2017.08.221
发表时间：
2017-09
期刊：
Energy Procedia
影响因子：
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作者：
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通讯作者：
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