Aerodynamic performance measurement of a novel variable geometry turbine adjustable guide vane scheme by experimental study

Yunjia Yao; Zhi Tao; Kun ZhouYufeng YangLiming SongJun LiZhenping Feng

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Aerodynamic performance measurement of a novel variable geometry turbine adjustable guide vane scheme by experimental study

机译：Aerodynamic performance measurement of a novel variable geometry turbine adjustable guide vane scheme by experimental study

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摘要

As the key component of new-generation variable cycle engines, the adjustable turbine guide vane's through-flow regulation capability and aerodynamic performance have a significant impact on the performance of the turbine stage and even the core engine. Conventional adjustable guide vanes control the through-flow capability by varying the installation angle and thus inevitably result in a gap clearance, which induces a new source of flow losses. This additional loss can degrade the aerodynamic performance of the variable geometry turbine considerably. Therefore, a novel adjustable guide vane scheme with a rotatable suction surface to regulate the through-flow capability is proposed in this paper and its superiority is verified in a typical small aspect-ratio vane. To this end, a high Mach number annular cascade test rig with high-resolution aerodynamic measurement systems is designed and built to determine the aerodynamic performance of this novel adjustable guide vane as well as a conventional one. The mass flow control capability, the total pressure loss coefficient, the isentropic Mach number at the blade surface, and the static pressure distribution at the endwall are measured for these two schemes, respectively. The flow details and loss mechanisms are also clarified with the aid of CFD. The results show that this novel adjustable guide vane scheme achieves a comparable through-flow control capability with respect to the conventional one, with a total pressure loss reduction of 25-35 at the measured Mach numbers. The flow details reveal that the novel scheme avoids the large-scale leakage vortex that exists in the conventional scheme and also produces a more uniform exit airflow angle distribution for the downstream rotor.

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来源
《Aerospace science and technology》 |2023年第9期|108413.1-108413.19|共19页
作者
Yunjia Yao; Zhi Tao; Kun ZhouYufeng YangLiming SongJun LiZhenping Feng;
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作者单位

Institute of Turbomachinery, Xi'an Jiaotong University, Xi'an, 710049, PR China;

Aero Engine Academy of China, Beijing, 101399, PRChina;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类航空;
关键词
Adjustable guide vane; Novel scheme; Aerodynamic performance; High Mach number; Variable geometry turbine;

Aerodynamic performance measurement of a novel variable geometry turbine adjustable guide vane scheme by experimental study

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