Analysis of Rotor-Rotor and Stator-Stator Interferences in Multi-Stage Turbomachines

He, L.; Chen, T.; Wells, R. Glenn; Li, Y. S.; Weng, Ning

doi:10.1115/gt2002-30355

Cited by 19 publications

(13 citation statements)

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“…As an alternative to classical time-marching approaches, the Fourier-based nonlinear harmonic method (NLH) is used. Originally proposed by He [19][20][21][22], the method has been implemented in Euranus by Vilmin [23], and assessed for many turbomachinery applications (see for instance Refs. [24][25][26] for instance).…”

Section: The Nonlinear Harmonic Methods (Nlh)mentioning

confidence: 99%

Validation and flow structure analysis in a turbofan stage at windmill

Dufour

Rosa

Duplaa

2015

Proceedings of the Institution of Mechanical Engineers, Part A:

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In the present study, the flow through the fan stage of a high bypass ratio turbofan at windmill is studied numerically. First, steady mixing plane simulations are validated against detailed experimental engine test-bed measurements, at several locations within the fan stage and close to the core/bypass flow splitter. Good agreement between the numerical and experimental results is obtained. A local flow analysis is proposed, evidencing several characteristics of the flow in windmilling: in the rotor, the size of the separation zone is found to increase from hub to tip, and in the stator, massive flow separation occurs at mid-span, which leads to the formation of two streamwise counter-rotating vortices. Then, the Nonlinear Harmonic (NLH) method is applied to a section (at 70 % of the relative span) of the fan stage. A modal analysis is performed, showing a specific behavior at windmill: the massively separated flows in the rotor and the stator entail strong rotor/stator interactions modes. Finally, the unsteady flow pattern is examined: the velocity defect of the rotor wake, which periodically increases the flow angle on the stator, is shown to trigger a periodic movement of the reattachment point at the trailing edge of the stator, associated with vortex shedding from the lower side of the vane. The implication of this qualitative flow behavior on the method to extract CFD results for comparisons with experiments is discussed.

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Section: The Nonlinear Harmonic Methods (Nlh)mentioning

confidence: 99%

Validation and flow structure analysis in a turbofan stage at windmill

Dufour

Rosa

Duplaa

2015

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…A number of experimental and numerical studies have been carried out in recent years to investigate these flow phenomena [e.g. Arnone et al 2000Arnone et al , 2002, Eulitz 2000Haldeman et al, 2003;He et al 2002, Howel et al 2001, Huber 1996, Hummel 2002Jouini et al 2003;Reinmoeller et al 2002, Saren et al 2002. The experimental work presented herein is the continuation of our earlier studies, starting from mid-nineties [e.g.…”

Section: Discussionmentioning

confidence: 99%

Unsteady Aerodynamics, Aeroacoustics and Aeroelasticity of Turbomachines

Hall¹,

Kielb²,

Thomas³

2006

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“…The results show that the unsteady flow in a turbomachine can be accurately simulated with a small number of modes retained in the Fourier series representation of the flow, leading to a reduction of at least one order of magnitude compared to conventional nonlinear time-resolved CFD simulation methods. In the same year, He et al 3 investigated the effects of circumferential distributions and the relative circumferential positioning of blades in multi-stage compressors using a nonlinear harmonic methodology. In recent decades, many researchers have contributed to the development of the harmonic balance method.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of the non-uniform flow in a full-annulus multi-stage axial compressor with the harmonic balance method

Sun

Wang

et al. 2020

Advances in Mechanical Engineering

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To improve the understanding of unsteady flow in modern advanced axial compressor, unsteady simulations on full-annulus multi-stage axial compressor are carried out with the harmonic balance method. Since the internal flow in turbomachinery is naturally periodic, the harmonic balance method can be used to reduce the computational cost. In order to verify the accuracy of the harmonic balance method, the numerical results are first compared with the experimental results. The results show that the internal flow field and the operating characteristics of the multi-stage axial compressor obtained by the harmonic balance method coincide with the experimental results with the relative error in the range of 3%. Through the analysis of the internal flow field of the axial compressor, it can be found that the airflow in the clearance of adjacent blade rows gradually changes from axisymmetric to non-axisymmetric and then returns to almost completely axisymmetric distribution before the downstream blade inlet, with only a slight non-axisymmetric distribution, which can be ignored. Moreover, the slight non-axisymmetric distribution will continue to accumulate with the development of the flow and, finally, form a distinct circumferential non-uniform flow field in latter stages, which may be the reason why the traditional single-passage numerical method will cause certain errors in multi-stage axial compressor simulations.

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Analysis of Rotor-Rotor and Stator-Stator Interferences in Multi-Stage Turbomachines

Cited by 19 publications

References 0 publications

Validation and flow structure analysis in a turbofan stage at windmill

Validation and flow structure analysis in a turbofan stage at windmill

Unsteady Aerodynamics, Aeroacoustics and Aeroelasticity of Turbomachines

Numerical simulation of the non-uniform flow in a full-annulus multi-stage axial compressor with the harmonic balance method

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