A Model for Liquid Films in Steam Turbines and Preliminary Validations

Simon, Amélie; Marcelet, Meryem; Hérard, Jean-Marc; Dorey, Jean-Marc; Lance, Michel

doi:10.1115/gt2016-56148

Cited by 6 publications

(2 citation statements)

References 26 publications

(51 reference statements)

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“…Test cases have been carried out to check the validity and robustness of the basic numerical model: dam break, hump, and falling liquid film in linear regime. The results, that are detailed in the reference 14 showed the capability of the model to reproduce analytical solutions, but also to approach the critical Reynolds number for a falling liquid film. Nevertheless, in these cases, the gas shear stress and the surface tension are not yet activated.…”

Section: Numerical Verifications and Validationsmentioning

confidence: 88%

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Development of a model for thin films and numerical sensitivity tests

Simon

Dorey

Lance

2018

Proceedings of the Institution of Mechanical Engineers, Part A:

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Because the unsteady behavior of liquid films in steam turbines is a key point for additional friction losses and atomization process (that leads to coarse water generation), the development of a dedicated model has been found necessary. A twodimensional computational fluid dynamics code for unstructured mesh is being developed using the finite volume method to simulate this thin liquid film. The aim is to predict the formation of the waves in the film since it is suspected to be a key parameter for friction and atomization. Applied as a first step to a plane plate, the code has been verified in a onedimensional version with analytical solutions and is tested in low-pressure turbine steam conditions. Falling films computations (without gas shear stress) show that the model is capable to reproduce the waves' shape of experiments from the literature. With steam under low-pressure turbine conditions, and compared to experimental data from the University of Michigan, the model including shear stress and surface tension provides good results for heights. Sensitivity calculations have been undergone showing the crucial influence of the surface tension and the generation of solitary waves for high velocities is captured by the code. The effect of gravity is also quantified.

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Section: Numerical Verifications and Validationsmentioning

confidence: 88%

“…The modeling process is summarized here below, and a more detailed description can be found in Simon et al 14 and Simon 15 .…”

Section: Film Modelmentioning

confidence: 99%

Development of a model for thin films and numerical sensitivity tests

Simon

Dorey

Lance

2018

Proceedings of the Institution of Mechanical Engineers, Part A:

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Einfluss von Wassertropfen oder Partikeln in der Verdichterluft

Joos

2020

Aerodynamik Axialer Turbokompressoren

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Numerical Model of Liquid Film Formation and Breakup in Last Stage of a Low-Pressure Steam Turbine

Rossi

Raheem

Abhari

2017

Journal of Engineering for Gas Turbines and Power

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Formation of thin liquid films on steam turbine airfoils, particularly in last stages of low-pressure (LP) steam turbines, and their breakup into coarse droplets is of paramount importance to assess erosion of last stage rotor blades given by the impact of those droplets. An approach for this problem is presented in this paper: this includes deposition of liquid water mass and momentum, film mass and momentum conservation, trailing edge breakup and droplets Lagrangian tracking accounting for inertia and drag. The use of thickness-averaged two-dimensional (2D) equations in local body-fitted coordinates, derived from Navier–Stokes equations, makes the approach suitable for arbitrary curved blades and integration with three-dimensional (3D) computational fluid dynamics (CFD) simulations. The model is implemented in the in-house solver MULTI3, which uses Reynolds-averaged Navier–Stokes equations κ – ω model and steam tables for the steam phase and was previously modified to run on multi-GPU architecture. The method is applied to the last stage of a steam turbine in full and part load operating conditions to validate the model by comparison with time-averaged data from experiments conducted in the same conditions. Droplets impact pattern on rotor blades is also predicted and shown.

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A Model for Liquid Films in Steam Turbines and Preliminary Validations

Cited by 6 publications

References 26 publications

Development of a model for thin films and numerical sensitivity tests

Development of a model for thin films and numerical sensitivity tests

Einfluss von Wassertropfen oder Partikeln in der Verdichterluft

Numerical Model of Liquid Film Formation and Breakup in Last Stage of a Low-Pressure Steam Turbine

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