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

Han, Xu; Han, Zhonghe; Li, Peng; Qian, Jing

doi:10.1002/ese3.298

Cited by 23 publications

(4 citation statements)

References 28 publications

(53 reference statements)

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“…The momentum conservation equations for the gas and liquid phases are expressed as (Han et al , 2019d): …”

Section: Mathematical Modelmentioning

confidence: 99%

Numerical investigation of the condensation flow characteristics and modification optimization of a condensing steam turbine cascade

Han

2019

HFF

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Purpose The purpose of this study is to improved the efficiency of condensing steam turbines by legitimately reforming the flow structure. It is of great significance to study the condensation flow characteristics of wet steam for optimizing the operation of condensing steam turbines. Design/methodology/approach A two-fluid model was used to study the wet steam flow in a stator cascade. The effects of the inlet temperature and pressure drop on the cascade performance were analyzed. On this basis, endwall protrusion models were set up at varied axial position on the pressure surface to evaluate the wetness control and loss under different design conditions for cascade optimization. Findings The analysis indicates that increasing the inlet temperature or decreasing the pressure drop can effectively control the steam wetness but increase the droplet radius. The increasing inlet temperature can delay the condensation and alleviate the deterioration of the aerodynamic performance of cascades. The non-axisymmetric endwall can significantly affect the distribution of steam parameters below its height and slightly reduce the droplet radius. Compared with the original stator cascade, the optimum design conditions reduce the steam wetness by 8.07 per cent and the total pressure loss by 6.91 per cent below a 20 per cent blade height. Originality/value These research results can serve as a reference for condensing steam turbine wetness losses evaluation and flow passage optimization design.

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“…The momentum conservation equations for the gas and liquid phases are expressed as (Han et al , 2019d): …”

Section: Mathematical Modelmentioning

confidence: 99%

Numerical investigation of the condensation flow characteristics and modification optimization of a condensing steam turbine cascade

Han

2019

HFF

Self Cite

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“…Gyarmathy considered the thermodynamic and kinematic behavior of a droplet in a gaseous carrier flow and developed a new mathematic model to predict the change rate of droplet size. This model has been widely used in the calculation of steam condensation in turbine stator cascades, dehumidification, steam ejector, and Laval nozzle . According to heat and mass transfer, Gyarmathy's model is employed to calculate the droplet growth rate (d r d /d t ).…”

Section: Mathematical Modelmentioning

confidence: 99%

A new liquefaction method for natural gas by utilizing cold energy and separating power of swirl nozzle

et al. 2019

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A swirl nozzle with a central body was newly designed to make full use of the cold energy and separating power, and the coupling of swirling flow and condensation was realized based on a condensation model, a droplet surface tension model and a Reynolds stress model turbulence model. The flow and condensation characteristics of methane gas under supersonic swirling flow conditions were studied. The results show that the flow and condensation parameter distribution in the swirl nozzle are similar under varying swirling intensities, but the swirling performance improves with the increase in swirling intensity, and a tangential velocity is beneficial before the gas enters the nozzle. As the inlet temperature decreases or the inlet pressure increases, the liquefaction efficiency increases, and the gas condensation process can be promoted. With the advancement of the initial nucleation position and the increase in the droplet radius, the separation efficiency of the swirl nozzle increases.

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“…In order to satisfy the required accuracy without large computational cost, the standard k-ε model is used to solve for turbulence in the calculation of the flow field (Han et al 2019a(Han et al , 2019bWen et al 2012). This model has the advantages of wide application, good economy, and reasonable accuracy.…”

Section: Turbulence Modelmentioning

confidence: 99%

Flow Characteristics of Wet Natural Gas in Different Throttling Devices

Cao¹,

Chu²,

Song³

et al. 2019

Frontiers in Heat and Mass Transfer

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Wet natural gas widely exists in the natural gas industry, and the selection of throttling devices plays an important role in wet natural gas transportation. In order to study the flow field characteristics of different throttling devices in wet natural gas pipelines, a set of Laval nozzles, orifice plates, and plate valves have been designed. The standard k-ε model was selected for numerical simulation. By changing inlet pressure, inlet temperature or volume fraction of water-liquid, the pressure field and temperature fields of different throttling devices were obtained, and the influence of the presence of a shockwave on the flow fields of the throttling devices was analyzed. Different throttling devices have significantly different operating characteristics. Therefore, appropriate throttling devices should be selected in different conditions in order to control the pressure of wet natural gas transportation and reduce gas hydrate formation. The present simulation results show that under identical conditions, the throat pressure and temperature of the Laval nozzle are the lowest, the throat pressure of the orifice plate is the highest, and the throat temperature of the plate valve is the highest.

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

Cited by 23 publications

References 28 publications

Numerical investigation of the condensation flow characteristics and modification optimization of a condensing steam turbine cascade

Numerical investigation of the condensation flow characteristics and modification optimization of a condensing steam turbine cascade

A new liquefaction method for natural gas by utilizing cold energy and separating power of swirl nozzle

Flow Characteristics of Wet Natural Gas in Different Throttling Devices

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