Investigation of flow characteristics in a rotor-stator cavity under crossflow using wall-modelled large-eddy simulation

作     者：Lei XIE Qiang DU Guang LIU Zengyan LIAN Yaguang XIE Yifu LUO Lei XIE;Qiang DU;Guang LIU;Zengyan LIAN;Yaguang XIE;Yifu LUO

作者机构：Key Lab of Light-duty Gas-turbineInstitute of Engineering ThermophysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of SciencesBeijing 100049China Innovation Academy for Light-duty Gas TurbineChinese Academy of SciencesBeijing 100190China 

出 版 物：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 (浙江大学学报（英文版）A辑（应用物理与工程）)

年 卷 期：2023年第24卷第6期

页      面：473-496页

核心收录：

学科分类：080704[工学-流体机械及工程] 08[工学] 080401[工学-精密仪器及机械] 0807[工学-动力工程及工程热物理] 0804[工学-仪器科学与技术] 

基　　金：This work is supported by the National Natural Science Foundation of China(No.5212201273) the National Science and Technology Major Project of China(No.J2019-III-0003) The CFX software and computation resource supplied by Beijing Super Cloud Computing Center,China are acknowledged 

主　　题：Wall-modeled large-eddy simulation(WMLES) Rotor-stator cavity Flow instability Reynolds-averaged Navier-Stokes(RANS) 

摘      要：Rotor-stator cavities are frequently encountered in engineering applications such as gas turbine *** are usually subject to an external hot mainstream crossflow which in general is highly swirled under the effect of the nozzle guide *** avoid hot mainstream gas ingress,the cavity is usually purged by a stream of sealing *** interactions between the external crossflow,cavity flow,and sealing flow are complicated and involve all scales of turbulent unsteadiness and flow instability which are beyond the resolution of the Reynolds-average *** cope with such a complex issue,a wall-modeled large-eddy simulation(WMLES)approach is adopted in this *** the simulation,a 20°sector model is used and subjected to a uniform pre-swirled external crossflow and a stream of radial sealing *** is triggered by a convergent Reynoldsaveraged Navier-Stokes(RANS)result in which the shear stress transport(SST)turbulent model is *** the WMLES simulation,the Smagoringsky sub-grid scale(SGS)model is applied.A scalar transportation equation is solved to simulate the blending and transportation process in the *** overall flow field characteristics and deviation between RANS and WMLES results are discussed *** RANS and WMLES results show a Batchelor flow mode,while distinct deviation is also *** in the small-radius region are caused by the insufficiency of the RANS approach in capturing the small-scale vortex structures in the boundary layer while deviations in the large-radius region are caused by the insufficiency of the RANS approach in predicting the external crossflow *** boundary layer vortex and external ingestion are then discussed in detail,highlighting the related flow ***,the large-flow structures induced by external flow ingress are analyzed using unsteady pressure oscillation signals.