汽轮机低压进汽结构气动性能分析与优化设计  

Optimization Design and Analysis of Steam Admission in Low Pressure Cylinder of Steam Turbines

作　　者：邵卫东[1,2] 吴方松[3] 李伯武[3] 尹刚[3] 张元林[3] 宋立明[1,2] 李军[1,2] SHAO Weidong WU Fangsong LI Bowu YIN Gang ZHANG Yuanlin SONG Liming LI Jun(Institute of Turbomachinery, Xi, an Jiaotong University, Xi, an 710049, China Industrial Turbine Sector of Dongfang Steam Turbine Co., Ltd., Deyang 618000, China Shaanxi Provincial Engineering Laboratory of Turbomachinery and Power Equipment, Xi＇an 710049, China)

机构地区：[1]西安交通大学叶轮机械研究所,西安710049 [2]陕西省叶轮机械及动力装备工程实验室,西安710049 [3]东方汽轮机有限公司工业透平事业部,德阳618000

出　　处：《热力透平》2017年第2期69-75,共7页Thermal Turbine

摘　　要：为设计高性能汽轮机低压进汽系统,采用数值求解三维Reynolds-Averaged Navier-Stokes(RANS)方程的方法研究了耦合低压第1级的低压进汽结构的气动性能,并对无叶通道进行了优化设计,同时考虑了不同蒸汽调节阀偏心度对低压进汽系统通流能力的影响。结果表明:原始低压进汽结构会造成较大跨度的静叶进汽攻角和较大的进汽不均匀度,最大汽流角分布在蜗壳的左右两侧;优化的策略在于增大进汽弯管的出流面积和倾角,通过减小滞止涡来减小汽流角跨度并降低进汽不均匀度,这样可以有效地改善第1级静叶进口的汽流组织情况;随着调节阀门偏心度的增加,蒸汽阀通流能力增大,且总压损失降低。研究工作为高性能汽轮机通流设计提供了技术支撑。In order to improve the steam admission system in low pressure cylinder of steam turbine, the aerodynamic performance of steam admission configuration coupled with the first stage was investigated with the method of solving the Reynolds-Averaged Navier-Stokes equation using the commercial software ANSYS- CFX. The optimization design of non-vane passage was done and the influence of different steam inlet valves on steam admission system was also analyzed. The numerical results show that the original steam admission configurations may lead to wide range of attack angle and large non-uniformity. The largest flow inlet angle is located at the left and right sides of steam volute. The optimization strategy is to increase the area and inclinations of steam admission elbows. The stagnation vortex is weakened to improve the steam organization in blade passage. The passable capacity of steam valve is increased with the increase of eccentricity, resulting in the decrease of total pressure loss. Relevant results of this study are expected to support the conjugated optimization design of flow passage in high performance steam turbine.

关 键 词：汽轮机 低压进汽蜗壳 蒸汽阀 气动性能 优化设计 

分 类 号：TK262[动力工程及工程热物理—动力机械及工程]