CFD modeling of condensation process of water vapor in supersonic flows

Yang, Yan; Walther, Jens Honoré; Yan, Yuying

doi:10.1016/j.applthermaleng.2017.01.047

Cited by 105 publications

(28 citation statements)

References 29 publications

(27 reference statements)

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“…Among the k-ε, k-ω and Reynolds stress models [30][31][32], the RNG k-ε turbulence 167 model [33] involves an additional term to its dissipation rate equation that can improve 168 the accuracy for rapidly strained flow. The swirling effect on the turbulence is also 169 included in the RNG k-ε model.…”

Section: Turbulence Model 166mentioning

confidence: 99%

“…The deposited liquid may block the pipeline 29 under the action of the gaseous phase and cause the sharp fluctuation of pressure [1]. It 30 affects the normal operation of the pipeline, even damages the conveying equipment . 31 In addition, the pipeline is more easily subjected to the corrosion issues [2,3], because 32 the deposited liquid is difficult to be removed.…”

Section: Introduction 25mentioning

confidence: 99%

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Gas-liquid two-phase flow behavior in terrain-inclined pipelines for gathering transport system of wet natural gas

Yang

Wang

et al. 2018

International Journal of Pressure Vessels and Piping

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Section: Turbulence Model 166mentioning

confidence: 99%

Section: Introduction 25mentioning

confidence: 99%

Gas-liquid two-phase flow behavior in terrain-inclined pipelines for gathering transport system of wet natural gas

Yang

Wang

et al. 2018

International Journal of Pressure Vessels and Piping

Self Cite

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“…The last few low-pressure cylinder stages of a condensing steam turbine in a traditional power plant and all stages of a water-cooled nuclear reactor steam turbine operate in the wet steam zone. 6,7 Existing research on wet steam condensation flow can be divided into four approaches: condensation theory, experimental research, numerical research, and analytical research. Second, the droplet trajectories in the wet steam flow lead to water erosion in several stages at the end of the turbine.…”

Section: Introductionmentioning

confidence: 99%

“…5 Spontaneous two-phase condensation flow in a steam turbine is highly complex; the study of such flow involves numerous disciplines of computational fluid dynamics, multiphase flow, heat and mass transfer, statistical thermodynamics and gas dynamics. 6,7 Existing research on wet steam condensation flow can be divided into four approaches: condensation theory, experimental research, numerical research, and analytical research. 8,9 Condensation theory includes the nucleation model and the water-droplet growth model.…”

Section: Introductionmentioning

confidence: 99%

Effect of the nonaxisymmetric endwall on wet steam condensation flow in a stator cascade

Han

et al. 2019

Energy Science & Engineering

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Steam turbines are critical pieces of power equipment in the electric power industry, and the study of wet steam condensation flow is important for improving the efficiency and safety of steam turbines. Wet steam nucleation, which is the main reason for thermodynamic losses, usually occurs downstream of the stator cascade. The mechanism of secondary flow loss control by the nonaxisymmetric endwall is the change of pressure distribution in the cascade channel. This mechanism also affects the wet steam condensation phenomenon. The positive/cosine function was proposed for endwall modification in the nucleation stage of a steam turbine. The design method presented in this paper can be used to produce endwall protrusions with different heights at different axial chords. To analyze the influence of the endwall protrusion design parameters on the condensation flow, nine endwall protrusion models were set up at varied axial positions. In comparison with the original cascade, the total pressure loss coefficient and outlet wetness were found to be ideal when the endwall protrusion maximum height was located at the 50% axial chord length of the stator and the protrusion was 3% of the blade height. The ideal incidence angle of this modified cascade was from −2° to + 10°.

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“…Existing research on wet steam condensation flow can be divided into four approaches: condensation theory, experimental research, numerical research, and analytical research [2,3]. The wet steam spontaneous condensation and droplet growth process occurs at the nanometre scale, and micro-droplet surface tension and mass transfer have always been difficult problems.…”

Section: Introductionmentioning

confidence: 99%

Coupled Model of Heat and Mass Balance for Droplet Growth in Wet Steam Non-Equilibrium Homogeneous Condensation Flow

Han

Qian

et al. 2017

Energies

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Abstract:Because of the complexity of wet steam two-phase condensation flow, many problems remain to be solved. The important part of condensation theory-the calculation of the water droplet growth model in the transition zone-is not ideal; thus, it is necessary to develop a water droplet growth model with full-scale range. On the basis of the heat and mass transfer equilibrium in droplet growth, a coupled model of heat and mass balance for droplet growth is proposed. To verify the accuracy of this model, the differences and applicable ranges of various models were analysed using the experimental data of Peters and Meyer and two widely used models. In the free molecular flow region, the heat and mass balance model coincides with the Young low-pressure correction model. In the transition region, the heat and mass balance model agrees well with the experimental values of Peters and Meyer. In the continuous flow region, the heat and mass balance model coincides with the Gyarmathy model. Therefore, the heat and mass balance model can be used to accurately describe the growth process of water droplets in the arbitrary range of Knudsen numbers.

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CFD modeling of condensation process of water vapor in supersonic flows

Cited by 105 publications

References 29 publications

Gas-liquid two-phase flow behavior in terrain-inclined pipelines for gathering transport system of wet natural gas

Gas-liquid two-phase flow behavior in terrain-inclined pipelines for gathering transport system of wet natural gas

Effect of the nonaxisymmetric endwall on wet steam condensation flow in a stator cascade

Coupled Model of Heat and Mass Balance for Droplet Growth in Wet Steam Non-Equilibrium Homogeneous Condensation Flow

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