...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Thermal engineering >Specific Features of the Flow Structure in a Reactive Type Turbine Stage
【24h】

Specific Features of the Flow Structure in a Reactive Type Turbine Stage

机译：反应式涡轮机级流动结构的特点

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 results of experimental studies of the gas dynamics for a reactive type turbine stage are presented. The objective of the studies is the measurement of the 3D flow fields in reference cross sections, experimental determination of the stage characteristics, and analysis of the flow structure for detecting the sources of kinetic energy losses. The integral characteristics of the studied stage are obtained by averaging the results of traversing the 3D flow over the area of the reference cross sections before and behind the stage. The averaging is performed using the conservation equations for mass, total energy flux, angular momentum with respect to the axis z of the turbine, entropy flow, and the radial projection of the momentum flux equation. The flow parameter distributions along the channel height behind the stage are obtained in the same way. More thorough analysis of the flow structure is performed after interpolation of the experimentally measured point parameter values and 3D flow velocities behind the stage. The obtained continuous velocity distributions in the absolute and relative coordinate systems are presented in the form of vector fields. The coordinates of the centers and the vectors of secondary vortices are determined using the results of point measurements of velocity vectors in the cross section behind the turbine stage and their subsequent interpolation. The approach to analysis of experimental data on aerodynamics of the turbine stage applied in this study allows one to find the detailed space structure of the working medium flow, including secondary coherent vortices at the root and peripheral regions of the air-gas part of the stage. The measured 3D flow parameter fields and their interpolation, on the one hand, point to possible sources of increased power losses, and, on the other hand, may serve as the basis for detailed testing of CFD models of the flow using both integral and local characteristics. The comparison of the numerical and experimental results, as regards local characteristics, using statistical methods yields the quantitative estimate of their agreement.
机译：给出了反应型涡轮级的气体动力学实验研究的结果。研究的目的是测量参考截面中的3D流场，实验确定级特性以及分析流结构以检测动能损失的来源。研究阶段的整体特征是通过在阶段前后在参考横截面区域上遍历3D流的结果求平均而获得的。使用质量，总能量通量，相对于涡轮机轴线z的角动量，熵流以及动量通量方程的径向投影的守恒方程进行平均。以相同的方式获得沿平台后面的通道高度的流动参数分布。在对实验测量的点参数值和平台后的3D流速进行插值后，将对流动结构进行更彻底的分析。在绝对坐标系和相对坐标系中获得的连续速度分布以矢量场的形式表示。中心坐标和次级涡旋矢量是使用涡轮级后截面中速度矢量的点测量结果及其后续插值确定的。在这项研究中使用的分析涡轮级空气动力学实验数据的方法，使人们可以找到工作介质流的详细空间结构，包括该级空气部分的根部和周边区域的次级相干涡。 。测得的3D流量参数字段及其插值一方面指向功率损耗增加的可能根源，另一方面，可以用作使用积分和局部两种方法对CFD模型进行详细测试的基础特征。使用统计方法对局部特征的数值和实验结果进行比较，得出对其一致性的定量估计。

著录项

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