Analysis of Flow Field and Loss Characteristics of High Endwall Angle Variable-geometry Power Turbine

被引：1
|
作者：
Gao J. [1 ]
Zheng Q. [1 ]
Zhao X. [2 ]
Yue G. [1 ]
Wang F. [1 ]
机构：
[1] College of Power and Energy Engineering, Harbin Engineering University, Harbin
[2] The 703 Research Institute of CSIC, Harbin
来源：
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | 2017年 / 53卷 / 10期
关键词：
Flow separation; High endwall angle; Leakage flow; Loss characteristics; Power turbine; Variable geometry;
D O I：
10.3901/JME.2017.10.193
中图分类号：
学科分类号：
摘要：
Numerical investigation is applied to a high endwall angle variable-geometry power turbine. The forming process of the variable vane endwall clearance leakage vortex is described. Then, the changes in the three-dimensional flow field and loss mechanisms of the variable turbine stage caused by the rotation of the variable vane are investigated. In addition, the effects of vane rotation on the overall performance of each power turbine stage are analyzed. The results show that, associated with turbine variable geometry, there are part clearances in the vane-end regions, which results in the existence of interaction zones of passage vortex and part clearance vortices. In addition, the core of the leakage vortex is made up of fluid that passes through the gap in the rear part of the rotating shaft. The rotation of the variable vane not only leads to the flow incidence to the vane self, but also results in a significant separated flow caused by high incidence near the downstream rotor leading edge. With the closing of the variable vane, the spiral upward movement of the separation bubble near the hub endwall induces the significant suction-side separated flow, showing strong three-dimensional flow characteristics, and it significantly deteriorates the variable geometry turbine performance. Besides, the rotation of the variable vane changes the vane throat area, redistributes the inter-stage enthalpy drop, and then affects each turbine stage performance to some extent. Overall, its effect on the variable geometry turbine stage is most obvious. © 2017 Journal of Mechanical Engineering.
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页码：193 / 200
页数：7
相关论文
共 16 条
  • [1] Deng Q., Zheng Q., Design of a 1.5 stage subsonic test turbine facility, Journal of Mechanical Engineering, 47, 4, pp. 155-163, (2011)
  • [2] Moffitt T.P., Whitney W.J., Schum H.J., Performance of a single-stage turbine as affected by variable stator area, (1969)
  • [3] Song L., Wang Y., Analysis on the loss model of variable geometry turbines, Gas Turbine Technology, 17, 2, pp. 35-40, (2004)
  • [4] Qiu C., Song H.F., Wang Y.H., Et al., Performance estimation of variable geometry turbines, Proc. IMechE Part A: Journal of Power and Energy, 223, 4, pp. 441-449, (2009)
  • [5] Razinsky E.H., Kuziak W.R., Aerothermodynamic performance of a variable nozzle power turbine stage for an automotive gas turbine, ASME Journal of Engineering for Gas Turbines and Power, 99, 4, pp. 587-592, (1977)
  • [6] Liu S., Feng Y., Liu M., Et al., The flow field structure of the power-turbine variable-area nozzle stage of a marine gas turbine, Journal of Engineering for Thermal Energy and Power, 20, 2, pp. 120-124, (2005)
  • [7] Feng Y., Liu S., Liu M., Et al., Three-dimensional numerical simulation of the flow characteristics at a large incidence of the variable-geometry power turbine of a marine gas turbine, Journal of Engineering for Thermal Energy and Power, 20, 5, pp. 459-463, (2005)
  • [8] Yue G.Q., Yin S.Q., Zheng Q., Numerical simulation of flow fields of variable geometry turbine with spherical endwalls or nonuniform clearance, (2009)
  • [9] Chen S., Qiu C., Song H., Numerical simulation on variable geometry linear turbine cascades by CFD, Gas Turbine Technology, 24, 3, pp. 32-35, (2010)
  • [10] Chen S., Qiu C., Song H., Variable geometry experimental study of a turbine plane cascade, Gas Turbine Technology, 26, 1, pp. 7-12, (2011)
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