Effect of NaCl presence caused by salting out on the heterogeneous-homogeneous coupling non-equilibrium condensation flow in a steam turbine cascade

Zhang, Guojie; Wang, Xiaogang; Wiśniewski, Piotr; Chen, Jiaheng; Qin, Xiang; Dykas, Sławomir

doi:10.1016/j.energy.2022.126074

Cited by 22 publications

(5 citation statements)

References 34 publications

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“…Where is latent heat. The transport equations are compiled into UDFs (user defined function) [12] and the phase transition is calculated using the ANSYS Fluent platform in homogeneous condensation. In the partial differential equation, n denotes the quantity of droplets per kilogram, y is the liquid mass fraction in the homogeneous condensation.…”

Section: Mathematical Modelmentioning

confidence: 99%

Performance prediction and loss evaluation of the carbon dioxide supersonic nozzle considering the non-equilibrium condensation

Guojie,

Yunpeng,

Jianming

et al. 2024

J. Phys.: Conf. Ser.

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Carbon dioxide (CO2) is being considered as a promising working medium in energy conversion and refrigeration cycles due to its unique properties. When carbon dioxide flows with supersonic in turbo machinery (compressor), the non-equilibrium effect is enhanced due to the large change of fluid velocity, resulting in non-equilibrium condensation of the blade, which will seriously affect the performance of the compressor. Considering the similarities in flow characteristics between the nozzle and the compressor blade, the condensing flow of the blade can be predicted by simulating in a nozzle. The real gas model is used. The pressure and the nucleation rate are predicted based on the modified model, and the flow losses and thermal efficiency are analyzed in different states. The results show that the pressure variation in the nozzle aligns well with the experimental data. When the fluid transitions from subcritical to supercritical, the condensation interval decreases and the peak of the nucleation rate increases. The maximum supercooling decreases gradually. The flow losses are relatively large, and the thermal efficiency is low.

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Section: Mathematical Modelmentioning

confidence: 99%

Performance prediction and loss evaluation of the carbon dioxide supersonic nozzle considering the non-equilibrium condensation

Guojie,

Yunpeng,

Jianming

et al. 2024

J. Phys.: Conf. Ser.

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show abstract

“…Hence, it becomes imperative to investigate the influence of condensation-related losses on steam turbine efficiency. Zhang et al [10] conducted a study to examine the impact of NaCl particle presence on the condensation process and losses in turbine cascades, their findings indicate that the condensation process and losses are significantly influenced by vapor impurities. Wen et al [11] developed a wet steam model to investigate the phase change process in turbine blade cascades.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of the heterogeneous condensation effect on the steam turbine performance

Zhang,

Wang,

et al. 2024

J. Phys.: Conf. Ser.

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The investigation of the loss and efficiency of steam turbine holds immense significance in improving the production of electric energy as a pivotal power conversion device in the electric power industry. However, during the expansion of steam in the steam turbine, the existence of heterogeneous particles leads to the heterogeneous condensation, resulting in a significant reduction in the turbine efficiency and safety of its operation. This study investigates the impact of heterogeneous condensation flow on the performance of steam turbines. First, a condensation model is developed, and numerical calculations are performed using the Bakhtar stator blade cascade. The validity of the proposed model is verified by comparing its results with existing experimental data. Then, the adiabatic flow (non-condensing), the homogeneous condensation flow, and the heterogeneous condensation flow on solid particles with a radius of 10-8[m] and particle concentration of 1015 and 1016[1/kg] are employed to investigate the effect of each flow type on steam turbine performance, and the loss, power, and efficiency in the turbine are detailedly and quantitatively calculated. The results show that in the presence of heterogeneous particles, increasing particle concentration appropriately can effectively reduce the loss caused by condensation and improve thermal efficiency.

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“…In steam low-pressure stage, due to the high steam velocity and low superheat temperature, the non-equilibrium condensation will take place, which will lead to the emergence of tiny droplets. 1,2 These water droplets deposit on the turbine blade surface and convert to the water film under the effects of inertial force and turbulent diffusion. 3 Then, the water film is forced to move on the blade surface under the effect of mainstream shear force, surface tension, solid surface friction and pressure gradient.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on the three-dimensional flow of water film on the outer surface of the hollow stationary blade

Chen,

Zhao,

Zhang

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part A:

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In order to figure out the influence of water film on the performance of the turbomachinery, understand the mechanism of the interaction between the high-speed airflow and the water film in turbomachinery, and provide a reference for the design of the subsequent experiments and hollow stationary blade water removal by heating. The commercial software FLUENT with the Eulerian Wall Films model is used to establish a solution method for simulating the flow of water film on the blade. The accuracy of the solution method is verified by comparing it with the results of the water film thickness experiment on the surface of the plate. The distribution of the water film on the outer surface of the vane as well as the influence of the water film on the mainstream field are numerically studied in the condition of the wet steam mainstream. The results show that the gradient of water film thickness on the pressure surface is relatively gentle and is along the radial direction. The gradient of water film thickness on the suction side is along the axial direction, and the value is larger; There is a V-shaped water film agglomeration area on the suction surface near the trailing edge where the water film thickness is greater than 45.7 μm; The top areas on both the suction side and pressure side produce a local water film agglomeration area with the dual effect of the secondary flow and the centrifugal force of the mainstream; The water film flow on the blade surface has little influence of the steam velocity and the speed of the mainstream. The increase of local pressure on the surface leads to an increase in the pressure of the adjacent mainstream areas.

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Effect of NaCl presence caused by salting out on the heterogeneous-homogeneous coupling non-equilibrium condensation flow in a steam turbine cascade

Cited by 22 publications

References 34 publications

Performance prediction and loss evaluation of the carbon dioxide supersonic nozzle considering the non-equilibrium condensation

Performance prediction and loss evaluation of the carbon dioxide supersonic nozzle considering the non-equilibrium condensation

Numerical study of the heterogeneous condensation effect on the steam turbine performance

Numerical study on the three-dimensional flow of water film on the outer surface of the hollow stationary blade

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