• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>ASME Turbo Expo: Turbomachinery Technical Conference and Exposition >EFFECT OF TURBULENCE MODEL ON THE PREDICTION OF PERFORMANCE AND SPAN-WISE MIXING IN HIGH-SPEED HIGHLY-LOADED MULTI-STAGE AXIAL-FLOW COMPRESSOR
【24h】

EFFECT OF TURBULENCE MODEL ON THE PREDICTION OF PERFORMANCE AND SPAN-WISE MIXING IN HIGH-SPEED HIGHLY-LOADED MULTI-STAGE AXIAL-FLOW COMPRESSOR

机译：湍流模型对高速高负荷多级轴流压缩机性能和跨度混合预测的影响

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Despite significant advancements in computational power and various numerical modeling in past decades, flow simulation of a multi-stage axial-flow compressor is still one of the most active areas of research, for it is the critical component in engine performance and operability, and there are so many elements that need to be looked into to predicting correct matching of the stages and accurate flow distribution inside the machine. Modeling unsteadiness, both deterministic and random types, and real geometries are among the most important features to be considered in such prediction. The authors have conducted in their previous studies a series of unsteady RANS (URANS) simulations of a 6.5-stage high-speed highly-loaded axial-flow compressor, and explored many unsteady effects as well as effects of real geometries such as Variable Stator Vane (VSV) clearance and inter-stage seal leakage flow on the compressor performance. However, all the analyses failed to predict correct stage matching, total pressure and temperature radial profiles, or mass-flow with adequate accuracies. In the present study, an Improved Delayed Detached Eddy Simulation (IDDES) with SST k-omega model is applied to the simulation of the same compressor configuration at aerodynamic design point. Fifth-order WENO scheme is employed for improved spatial accuracy to suppress significant increase in mesh size. Total number of mesh points are over 400 million for 1/10th sector model. Computations are ensemble averaged for 20 sector passage. Computed overall performance and flow field are compared with the compressor rig test data. The predictions of inter-stage total temperature radial profiles are noticeably improved over the URANS with the same mesh, discretization scheme and eddy turbulence model. Good comparison with the rig data indicates the current simulation is properly capturing the span-wise mixing phenomena. Unsteady flow field are compared between IDDES and URANS to locate the cause for the enhanced mixing. It is shown that components of Reynolds stress responsible for radial diffusion and anisotropic features are intensified in the tip leakage vortex at the rotor exit for the IDDES.
机译：尽管在过去几十年中计算了计算能力和各种数值模型的显着进展，但多级轴流压缩机的流量模拟仍然是最活跃的研究领域之一，因为它是发动机性能和可操作性的关键部件，以及是如此多的元素，需要观察预测机器内部的阶段和准确的流量分布。模拟不稳定性，确定性和随机类型，以及实际几何形状是在这种预测中被考虑的最重要的特征之一。作者在他们之前的研究中进行了一系列不稳定的RANS（urans）模拟的6.5级高速高速加载的轴流压缩机，并探讨了许多不稳定的效果以及实际几何形状的效果，如可变定子叶片（VSV）间隙和阶段间密封泄漏流量对压缩机性能。然而，所有分析都未能预测正确的阶段匹配，总压力和温度径向谱，或具有足够精度的质量流动。在本研究中，利用SST k-Omega模型改进的延迟分离涡流模拟（IDDES）应用于空气动力学设计点的相同压缩机配置的模拟。使用第五阶WENO方案用于改善空间精度以抑制网眼尺寸的显着增加。 1/10扇区模型的网点总数超过4亿。计算是20个扇区通道的整体。计算的整体性能和流场与压缩机钻机测试数据进行比较。通过相同网格，离散化方案和涡流湍流模型的铀，显着改善了阶段间的总升温径向轮廓的预测。与钻机数据的良好比较表明电流模拟正确捕获跨越式混合现象。在IDDES和URAN之间比较不稳定的流场，以定位增强混合的原因。结果表明，负责径向扩散和各向异性特征的reynolds应力的部件在转子出口的尖端泄漏涡流中加剧了IDDES。

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