...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of turbomachinery >Time-Averaged and Time-Accurate Aerodynamic Effects of Rotor Purge Flow for a Modern, One and One-Half Stage High-Pressure Turbine-Part Ⅱ: Analytical Flow Field Analysis
【24h】

Time-Averaged and Time-Accurate Aerodynamic Effects of Rotor Purge Flow for a Modern, One and One-Half Stage High-Pressure Turbine-Part Ⅱ: Analytical Flow Field Analysis

机译：现代的一级半高压汽轮机转子吹扫流的时间平均和时间精确的空气动力学效应-第二部分：流场分析

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The detailed mechanisms of purge flow interaction with the hot-gas flow path were investigated using both unsteady computationally fluid dynamics (CFD) and measurements for a turbine operating at design corrected conditions. This turbine consisted of a single-stage high-pressure turbine and the downstream, low-pressure turbine nozzle row with an aerodynamic design equivalent to actual engine hardware and typical of a commercial, high-pressure ratio, transonic turbine. The high-pressure vane airfoils and inner and outer end walls incorporated state-of-the-art film cooling, and purge flow was introduced into the cavity located between the high-pressure vane and disk. The flow field above and below the blade angel wing was characterized by both temperature and pressure measurements. Predictions of the time-dependent flow field were obtained using a three-dimensional, Reynolds-averaged Navier-Stokes CFD code and a computational model incorporating the three blade rows and the purge flow cavity. The predictions were performed to evaluate the accuracy obtained by a design style application of the code, and no adjustment of boundary conditions was made to better match the experimental data. Part Ⅰ of this paper compared the predictions to the measurements in and around the purge flow cavity and demonstrated good correlation. Part Ⅱ of this paper concentrates on the analytical results, looking at the primary gas path ingestion mechanism into the cavity as well as the effects of the rotor purge on the upstream vane and downstream rotor aerodynamics and thermodynamics. Ingestion into the cavity is driven by high static pressure regions downstream of the vane, high-velocity flow coming off the pressure side of the vane, and the blade bow waves. The introduction of the purge flow is seen to have an effect on the static pressure of the vane trailing edge in the lower 5% of span. In addition, the purge flow is weak enough that upon exiting the cavity, it is swept into the mainstream flow and provides no additional cooling benefits on the platform of the rotating blade.
机译：使用非稳态计算流体动力学（CFD）和在设计校正条件下运行的涡轮机的测量结果，研究了吹扫流与热气流路径相互作用的详细机制。该涡轮机由单级高压涡轮机和下游低压涡轮机喷嘴排组成，其空气动力学设计等效于实际发动机硬件，并且是典型的商用高压比跨音速涡轮机。高压叶片翼型以及内端壁和外端壁采用了最新的薄膜冷却技术，吹扫气流被引入位于高压叶片和阀瓣之间的空腔中。通过温度和压力测量来表征叶片天使翼上方和下方的流场。使用三维，雷诺平均的Navier-Stokes CFD代码和包含三个叶片行和吹扫流腔的计算模型，可以获得与时间有关的流场的预测。进行预测是为了评估通过代码的设计风格应用获得的准确性，并且没有进行边界条件的调整以更好地匹配实验数据。本文的第一部分将预测结果与吹扫流腔内和周围的测量值进行了比较，并显示出良好的相关性。本文的第二部分着重于分析结果，着眼于进入腔体的主要气体路径摄入机理，以及转子吹扫对上游叶片和下游转子的空气动力学和热力学的影响。叶片下游的高静压区域，从叶片压力侧流出的高速流动以及叶片弓形波驱动着向腔内的摄入。可以看到，吹扫气流的引入在跨度的下5％内对叶片后缘的静压产生影响。另外，吹扫气流足够弱，以至于在离开腔室时被吹扫到主流中，并且在旋转叶片的平台上没有提供额外的冷却益处。

著录项

  • 来源
    《Journal of turbomachinery》 |2014年第1期|011009.1-011009.12|共12页
  • 作者

    Brian R. Green; Randall M. Mathison; Michael G. Dunn;

  • 作者单位

    GE Aviation, Cincinnati, OH 45215;

    Gas Turbine Laboratory, The Ohio State University, 2300 West Case Rd., Columbus, OH 43235;

    Gas Turbine Laboratory, The Ohio State University, 2300 West Case Rd., Columbus, OH 43235;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号