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首页> 外文期刊>Journal of Aerospace Sciences and Technologies >AERODYNAMICS OF TIP LEAKAGE FLOWS NEAR PARTIAL SQUEALER RIMS IN AN AXIAL FLOW TURBINE WITH AND WITHOUT WALL MOTION
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AERODYNAMICS OF TIP LEAKAGE FLOWS NEAR PARTIAL SQUEALER RIMS IN AN AXIAL FLOW TURBINE WITH AND WITHOUT WALL MOTION

机译：带有和不带有壁式运动的轴流涡轮中局部隔段边缘附近的漏气动力学

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摘要

The objective of present investigation is to study aerodynamics of tip leakage flows near partial squealer rims in an axial flow turbine cascade with and without end wall in motion. The reaction turbine blade used in the present investigations has a blade length of 400 mm and a geometric deflection of 82°. The blade chord is 102 mm with an aspect ratio of 3.9. The tip gap is maintained at 2% (2.04 mm) and the squealer rims were of 1.02 mm height. A total of seven cases were investigated with different squealer geometries including case without squealer rim. The coefficient of secondary loss coefficient (CSKE) is used as objective function. Minimum CSKE indicates minimum losses. From the investigations it is concluded that full suction side squealer rim is the optimum squealer geometry among all cases studied as CSKE was found to be minimum for this geometry. The optimum case was selected for wall motion studies. Three wall motions, namely; 75%,100% and 125% of the inlet meridional velocity were maintained and investigated. The CSKE is reduced with all three end wall motions except very close to the end wall. The exit flow angle is reduced near the end wall as compared to no wall motion.
机译：本研究的目的是研究带有和不带端壁的轴流式涡轮机叶栅中部分泄油槽边缘附近的叶尖泄漏流的空气动力学。在本研究中使用的反应涡轮叶片具有400 mm的叶片长度和82°的几何变形。叶片弦长为102毫米，长宽比为3.9。刀尖间隙保持在2％（2.04毫米），刮刀轮辋的高度为1.02毫米。共调查了7个案例，这些案例具有不同的窃听器几何形状，包括无窃听器边缘的情况。次级损耗系数（CSKE）用作目标函数。最小CSKE表示最小损失。从调查中得出的结论是，在所有研究的案例中，全吸力的侧置挡泥板轮辋是最佳的挡泥板几何形状，因为发现CSKE对于这种几何形状来说是最小的。选择最佳案例进行壁运动研究。三个壁运动，即；维持并研究了入口子午线速度的75％，100％和125％。除了非常靠近端壁外，所有三个端壁运动都会降低CSKE。与无壁运动相比，出口流角在端壁附近减小。

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  • 来源
    《Journal of Aerospace Sciences and Technologies》 |2014年第3期|186-199|共14页
  • 作者

    Narendra Bansode; M. Govardhan;

  • 作者单位

    Department of Mechanical Engineering Indian Institute of Technology Madras Chennai-600 036, India;

    Department of Mechanical Engineering Indian Institute of Technology Madras Chennai-600 036, India;

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