...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Energy Resources Technology >Numerical Predictions of Three- Dimensional Unsteady Turbulent Film-Cooling for Trailing Edge of Gas-Turbine Blade Using Large Eddy Simulation
【24h】

Numerical Predictions of Three- Dimensional Unsteady Turbulent Film-Cooling for Trailing Edge of Gas-Turbine Blade Using Large Eddy Simulation

机译：基于大涡模拟的燃气轮机叶片后缘三维非稳态湍流膜冷却数值预测

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

This work investigates the performance of film-cooling on trailing edge of gas turbine blades using unsteady three-dimensional numerical model adopting large eddy simulation (LES) turbulence scheme in a low Mach number flow regime. This study is concerned with the scaling parameters affecting effectiveness and heat transfer performance on the trailing edge, as a critical design parameter, of gas turbine blades. Simulations were performed using ANSYS-FLUENT WORKBENCH 17.2. High quality mesh was adapted, whereas the size of cells adjacent to the wall was optimized carefully to sufficiently resolve the boundary layer to obtain insight predictions of the film-cooling effectiveness on a flat plate downstream the slot opening. Blowing ratio, density ratio, Reynolds number, and the turbulence intensity of the mainstream and coolant flow are optimally examined against the film-cooling effectiveness. The predicted results showed a great agreement when compared with the experiments. The results show a distinctive behavior of the cooling effectiveness with blowing ratio variation as it has a dip in vicinity of unity which is explained by the behavior of the vortex entrainment and momentum of coolant flow. The negative effect of the turbulence intensity on the cooling effectiveness is demonstrated as well.
机译：这项工作使用不稳定的三维数值模型，在低马赫数流态下采用大涡流模拟（LES）湍流方案，研究了燃气轮机叶片后缘的薄膜冷却性能。这项研究与缩放系数有关，作为燃气轮机叶片的关键设计参数，该缩放参数会影响后缘的有效性和传热性能。使用ANSYS-FLUENT WORKBENCH 17.2进行了仿真。改编了高质量的网格，而仔细地优化了与壁相邻的单元的大小，以充分解决边界层问题，从而获得缝隙开口下游平板上的薄膜冷却效果的深入预测。针对薄膜冷却效果，对鼓风比，密度比，雷诺数以及主流和冷却剂流的湍流强度进行了最佳检查。与实验相比，预测结果显示出很好的一致性。结果表明，随着吹气比的变化，冷却效率具有显着的表现，因为它在1附近有一个下降，这可以通过涡旋夹带的行为和冷却剂流动的动量来解释。湍流强度对冷却效率的负面影响也得到了证明。

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