阻尼拉金结构的长叶片透平级气动性能数值研究-学兔兔 www.xuetutu.com.pdf

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第4期
No 4
2014年12月
DONGFANG TURBINI
Dec.2014
阻尼拉金结构的长叶片透平级气动性能数值研究
李彬,宋立明,李军
(西安交通大学叶轮机械研究所,陕西西安,710049)
摘要:文章采用商用计算流体动力学教件 ANSYS-CFX数值求解 Reynolds- Averaged Navier-Soks(RANS)方程和标
准k-e尞流模型方法数值研究了考虑阻尼拉金結构的汽轮机长叶片透平级的气动性能。分别计算分析了无阻尼拉金结构、
椭圆型阻尼拉金结构和流线型阻尼拉金結构的汽轮机长叶片透平级的流场特性,详细分析了阻尼拉金对长叶片透平级气动
性能的影响特性。研究结果表明:阻尼拉金的存在对长叶片流场的影响主要位于叶片吸力面附近。采用椭圆型拉金及流线
型拉金长叶片的透平级与无拉金的情况相比,透平级等效率分别降低0.313%和0.206%,采用流线型阻尼拉全后透平级等
熵效率比国型拉金提高0.107%。相比于椭圆型阻尼拉金结构的长叶片,流线型阻尼拉金结构在其尾缘处的分离涡基本消
除,拉金尾缘处的流动损失减少
关键词;汽轮机,长叶片,皿尼拉金,气动性能,數值模拟
中图分类号:TK263
文献标识码:A
文章编号:1674-9987(2014)04-0012-05
Numerical Investigation on Aerodynamic Performance
of Long Blade with Damping Snubber
Li Bin, Song Liming, Li Jun
(Institute of Turbomachinery, X an Jiaotong University, Xi an Shaanxi, 710049)
Abstract: Aerodynamic performance of the long blade turbine stage with damping snubber structure was numerically investigated
by using commercial CFD software ANSYS-CFX based on the Reynolds-averaged Navier-stokes (RANS)equation and standard
turbulent model solution. The characteristics of flow field for the long blade turbine stage without damping snubber, with elliptical
damping snubber and streamlined damping snubber structure were calculated. The effect of the damping snubber on the aerodynam-
ic performance of turbine stage was also analyzed. The numerical result showed that the isentropic efficieney of the turbine stage
with elliptical and streamlined damping snubber decreased by 0.313% and 0.206% by comparison to the consideration of turbine
stage without damping snubber. In addition, the isentropic efficiency of the long blade turbine stage with streamlined damping snub-
ber increased by 0.107 by comparison to the elliptical snubber case. Comparison with the elliptical damping snubber structure, the
separation vortex near the trailing edge of the streamlined damping snubber was eliminated and the corresponding separation flow
loss was also decreased
Key words: steam turbine, long blade, damping snubber, aerodynamic performance, numerical simulation
基金项目:国家自然科学基金资助项目(51106123)和中央高校基本科研业务费专项基金。
作者简介:李彬(1987-),男,西安交通大学动力工程及工程热物理专业博土研究生,研究方向是叶轮机械气动热力学与优化设计。
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