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Turbulence Model Comparative Study for Complex Phenomena in Supersonic Steam Ejectors with Double Choking Mode.

Yiqiao Li1, Chao Niu1, Shengqiang Shen1

  • 1National Joint Engineering Research Center for Thermal Energy Integration, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China.

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Summary

This study highlights the impact of non-equilibrium condensation on supersonic steam ejector simulations. The k-ω SST model is recommended for accurately predicting complex flow phenomena and ejector performance.

Keywords:
boundary layer separationnon-equilibrium condensationshock wavesteam ejectorturbulence models

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Area of Science:

  • Thermodynamics and Fluid Mechanics
  • Computational Fluid Dynamics

Background:

  • Supersonic steam ejector performance is crucial in various industrial applications.
  • Existing turbulence-model comparative studies often overlook non-equilibrium condensation effects.

Purpose of the Study:

  • To investigate the influence of non-equilibrium condensation on supersonic steam ejector simulations.
  • To compare the predictive capabilities of seven different turbulence models when coupled with a non-equilibrium condensation model.
  • To identify the most suitable turbulence model for simulating supersonic steam ejectors.

Main Methods:

  • Coupling a non-equilibrium condensation model with seven turbulence models (k-ε Standard, k-ε RNG, k-ε Realizable, k-ω Standard, k-ω SST, Transition SST, Linear Reynolds Stress Model).
  • Comparing simulation results with experimental data, both globally and locally.
  • Analyzing complex flow phenomena such as shock waves, choking, condensation, boundary layer separation, and vortices.

Main Results:

  • Different turbulence models predict varying numbers and types of shock waves.
  • The regions of non-equilibrium condensation and boundary layer separation differ significantly across models.
  • The k-ω SST model demonstrated superior agreement with experimental results for both flow phenomena and ejector performance.

Conclusions:

  • Non-equilibrium condensation significantly impacts the simulation accuracy of supersonic steam ejectors.
  • The choice of turbulence model critically affects the prediction of flow structures and performance.
  • The k-ω SST model is proposed as the most effective for simulating supersonic steam ejectors due to its ability to capture complex phenomena accurately.