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

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第6期24卷 473-496页

作者： Lei XIE Qiang DU Guang LIU Zengyan LIAN Yaguang XIE Yifu LUO Key Lab of Light-duty Gas-turbine Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Innovation Academy for Light-duty Gas Turbine Chinese Academy of SciencesBeijing 100190China

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.

关键词： Wall-modeled large-eddy simulation(WMLES) rotor-stator cavity Flow instability Reynolds-averaged Navier-Stokes(RANS)

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Performance Analysis of Inter-Stage Leakage Flows at Rotating Conditions in an Axial Compressor

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Journal of Thermal Science 2020年第6期29卷 1558-1568页

作者： KONG Xiaozhi LIU Yuxin LU Huawei TIAN Zhitao XIN Jianchi Naval Architecture and Ocean Engineering College Dalian Maritime UniversityDalian 116026China Marine Engineering College Dalian Maritime UniversityDalian 116026China

For the compressor with shrouded stator blades,the stator well is a rotor-stator space between the rotating drum and the stationary *** to the pressure difference,a reverse leakage flow would travel through the stator well and inject into the main flow ***,the labyrinth seal is commonly placed under the shroud,the rotation effect and seal clearance variation in actual operation process have great impact on the characteristics of this inter-stage leakage,as well as the compressor *** this paper,experiments were conducted at a compressor inter-stage seal test *** leakage flow rates,total temperatures and swirl ratios were obtained at different speeds and working *** proportions of rotation effect and the clearance reduction effect were analyzed by data *** indicate that the working clearance and leakage flow reduce about 43%and 50%respectively,when the rotational speedω=8100 r/*** proportion of reduction caused by the rotation effect is around 15%,while the influence of working clearance variation is much greater,accounting for about 35%.The windage heating coefficient and swirl ratio in the outlet cavity are almost in exponential relationship with the rotor *** increases in total temperature and swirl ratio generated by the rotation effect are found to be about 80%.In addition,the swirl and radial velocity profiles in the cavities were discussed by validated numerical simulations to reveal the typical flow *** data presented can provide guidance for better leakage conditions prediction as well as the inter-stage seal design enhancement.

关键词： shrouded stator blade inter-stage seal rotor-stator cavity leakage flow windage heating swirl ratio

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Investigation of the fluid flow in an isolated rotor-stator system with a peripheral opening

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Science China(Physics,Mechanics & Astronomy) 2013年第4期56卷 745-754页

作者： DEBUCHY Roger ABDEL NOUR Fadi NAJI Hassane BOIS Gérard Laboratoire Génie Civil & géo-Environnement (LGCgE- EA 4515) UArtois/FSA Béthune F-62400 Béthune France Université Lille Nord de France F-59000 Lille France Damascus University Department of Water Engineering Damascus Syria LML-PRES Lille Nord de France Arts et Métiers ParisTech Lille France

This paper deals with an experimental, theoretical and numerical study of a turbulent flow with separated boundary layers between a rotor and a stator. The system is not subjected to any superimposed radial flow. The periphery of the cavity is opened to the atmosphere so that the solid body rotation for infinite discs is not always observed. Emphasis was placed on develop- ment of an asymptotic approach and a step-by-step method to compute the radial distribution of the core swirl ratio and the static pressure on the stator side. The theory also includes the radial and axial velocities in the core region. The numerical simulation has been conducted with the commercial CFD code Fluent 6.1. The k- SST turbulence model is used, with the assumption of 2D-axisymmetric and steady flow. CFD validations have been performed by comparison of the numerical results with the corresponding theoretical results. Numerical and experimental results are in good agreement with analytical solutions.

关键词： rotor-stator cavity analytical solution numerical simulations k- SST turbulence model

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