• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The Aeronautical Journal >Comprehensive validation of an intermittency transport model for transitional low-pressure turbine flows
【24h】

Comprehensive validation of an intermittency transport model for transitional low-pressure turbine flows

机译：过渡式低压涡轮机流动的间歇传输模型的综合验证

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

A transport equation for the intermittency factor is employed to predict transitional flows under the effects of pressure gradients, freestream turbulence intensities, Reynolds number variations, flow separation and reattachment, and unsteady wake-blade interactions representing diverse operating conditions encountered in low-pressure turbines. The intermittent behaviour of the transitional flows is taken into account and incorporated into computations by modifying the eddy viscosity, μ_τ, with the intermittency factor, γ. Turbulent quantities are predicted by using Menter's two-equation turbulence model (SST). The onset location of transition is obtained from correlations based on boundary-layer momentum thickness, accelaration parameter, and turbulence intensity. The intermittency factor is obtained from a transport model which can produce both the experimentally observed streamwise variation of intermittency and a realistic profile in the cross stream direction. The intermittency transport model is tested and validated against several well documented low pressure turbine experiments ranging from flat plate cases to unsteady wake-blade interaction experiments. Overall, good agreement between the experimental data and computational results is obtained illustrating the predicting capabilities of the model and the current intermittency transport modelling approach for transitional flow simulations.
机译：使用间歇性因子的输运方程式来预测压力梯度，自由流湍流强度，雷诺数变化，流分离和重新附着以及不稳定的尾翼叶片相互作用（在低压涡轮中遇到的各种情况）的影响下的过渡流。考虑了过渡流的间歇性行为，并通过使用间歇因子γ修改了涡流粘度μ_τ并将其纳入了计算。湍流量通过使用Menter的二方程湍流模型（SST）进行预测。过渡的起始位置是基于边界层动量厚度，加速度参数和湍流强度的相关性获得的。从运输模型获得间歇性因子，该运输模型既可以产生实验观察到的间歇性沿流的变化，也可以产生横流方向上的实际轮廓。间歇运输模型是根据从平板机壳到不稳定桨叶相互作用实验等数项有据可查的低压涡轮机实验进行测试和验证的。总体而言，在实验数据和计算结果之间取得了良好的一致性，说明了模型的预测能力以及当前用于过渡流模拟的间歇运输模型方法。

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