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采用不同黏性处理方法的宽无叶扩压器不稳定流动研究

胡晨星 杨策

胡晨星, 杨策. 采用不同黏性处理方法的宽无叶扩压器不稳定流动研究[J]. 力学学报, 2019, 51(6): 1775-1784. doi: 10.6052/0459-1879-19-207
引用本文: 胡晨星, 杨策. 采用不同黏性处理方法的宽无叶扩压器不稳定流动研究[J]. 力学学报, 2019, 51(6): 1775-1784. doi: 10.6052/0459-1879-19-207
Hu Chenxing, Yang Ce. STUDY ON INSTABILITY OF THE WIDE VANELESS DIFFUSER WITH DIFFERENT TREATMENTS OF VISCOSITY[J]. Chinese Journal of Theoretical and Applied Mechanics, 2019, 51(6): 1775-1784. doi: 10.6052/0459-1879-19-207
Citation: Hu Chenxing, Yang Ce. STUDY ON INSTABILITY OF THE WIDE VANELESS DIFFUSER WITH DIFFERENT TREATMENTS OF VISCOSITY[J]. Chinese Journal of Theoretical and Applied Mechanics, 2019, 51(6): 1775-1784. doi: 10.6052/0459-1879-19-207

采用不同黏性处理方法的宽无叶扩压器不稳定流动研究

doi: 10.6052/0459-1879-19-207
基金项目: 1) 国家自然科学基金资助项目(51736001)
详细信息
    通讯作者:

    杨策

  • 中图分类号: O357

STUDY ON INSTABILITY OF THE WIDE VANELESS DIFFUSER WITH DIFFERENT TREATMENTS OF VISCOSITY

  • 摘要: 径向无叶扩压器的全局稳定性可能受到核心主流失稳,出口回流与壁面边界层分离等因素影响,对于宽无叶扩压器,无黏核心主流与壁面边界层流动对不稳定扰动诱发的作用机理是当前研究的重点.本文首先通过数值计算获得了大宽度比孤立无叶扩压器平均流动,然后基于小扰动理论和周向均质假设,分别对欧拉方程与 Navier-Stokes 方程进行线性化,建立了基于无黏核心流动的稳定性分析方法,以及基于涡黏性与分子黏性的混合稳定性分析方法;通过与实验结果的对比,验证了混合稳定性分析方法预测所得流动失稳频率和全局直接模态的准确性;最后基于伴随方法获得了特征值的结构敏感性,揭示了不同黏性处理条件下宽无叶扩压器内全局不失稳扰动的源发区域.在只考虑核心主流的无黏条件下,宽无叶扩压器内流动不稳定扰动来源于流场中部,为二维的离心失稳;在同时考虑核心主流与边界层的作用时,宽无叶扩压器不稳定扰动不仅来源于扩压器流场中部的核心主流,壁面回流对于不稳定扰动的产生了重要影响.

     

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出版历程
  • 收稿日期:  2019-07-29
  • 刊出日期:  2019-11-18

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