Performance analysis and optimization of a steam ejector through streamlining of the primary nozzle

Sun, Wenxu; Ma, Xiaojing; Zhang, Yuanmin; Jia, Lixin; Xue, Haoyuan

doi:10.1016/j.csite.2021.101356

Cited by 29 publications

(9 citation statements)

References 30 publications

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“…Based on the operating environment of the ejector and the design theory of the ejector, the structural parameters of the ejector are calculated as shown in Table 1 . Because the operating circumstances of the system vary within a range, when the primary steam pressure is insufficient, the streamlined primary nozzle can achieve a greater entrainment ratio than the normal primary nozzle [ 31 ]. As a result, the primary flow nozzle in this study was designed in a streamlined manner.…”

Section: Ejectormentioning

confidence: 99%

“…Based on the above assumptions, the following expressions are used [ 31 ]: Laws of conservation of mass:

Law of conservation of energy:

Law of conservation of momentum:

Droplet number density equation:

where

is the density,

is the total energy,

is the velocity,

is the dynamic viscosity coefficient,

is the thermal conductivity,

is the static temperature.…”

Section: Numerical Proceduresmentioning

confidence: 99%

“…To verify the mesh independence and ensure that the number of meshes did not affect the simulation results of the ejector, the ejector model was divided into coarse mesh (13683), medium mesh (27888), fine mesh (58361), and very fine mesh (87577). Mesh independence verification using the axial Mach number and static pressure [ 31 ] is shown in Figure 4 and Figure 5 . Because the non-equilibrium condensation process of the ejector was explored in this study, the axial liquid mass fraction and droplet nucleation rate were used to assist the verification of mesh independence, as shown in Figure 6 and Figure 7 .…”

Section: Numerical Proceduresmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Superheat Steam on Ejector in Distilled Water Preparation System for Medical Injection

Yang

Zhang

et al. 2022

Entropy

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In this study, a wet steam model was used to investigate the effect of steam superheat on ejector performance and non-equilibrium condensation phenomena. The simulation data for the ejector were validated with experimental data. The simulations show that an increase in primary flow superheat will increase the entrainment ratio, while an increase in secondary flow superheat will decrease the entrainment ratio. The output fluid superheat has little effect on the entrainment ratio. As the primary flow superheat increases from 0 to 20 K, the starting position of non-equilibrium condensation moves backward by 5 mm, and the mass fraction of condensed droplets decreases by 20%. The higher the secondary flow superheat, the lower the mass fraction of liquid in the diffusion chamber. The superheat level of the output fluid has no influence on the non-equilibrium condensation phenomenon of the ejector.

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Section: Ejectormentioning

confidence: 99%

“…Based on the above assumptions, the following expressions are used [ 31 ]: Laws of conservation of mass:

Law of conservation of energy:

Law of conservation of momentum:

Droplet number density equation:

where

is the density,

is the total energy,

is the velocity,

is the dynamic viscosity coefficient,

is the thermal conductivity,

is the static temperature.…”

Section: Numerical Proceduresmentioning

confidence: 99%

Section: Numerical Proceduresmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Superheat Steam on Ejector in Distilled Water Preparation System for Medical Injection

Yang

Zhang

et al. 2022

Entropy

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“…Through a simple structure, utilizing high-speed airflow to inject low-speed airflow, there is a wealth of related research and experiments on ejector nozzles in aerospace engineering and energy fields [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Optimal Design of Ejector Nozzle Profile with Internal and External Integrated Flow

He,

Shi,

2024

Aerospace

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Based on the orthogonal experimental method, a simulation case of the flow field of the ejector nozzle was designed to investigate the influence of the structural parameters of the ejector nozzle on the internal and external flow. This study explored the effects of throat area, outlet area, throat position, and ejector nozzle length on the ejector flow rate ratio, thrust coefficient, and net thrust coefficient. Subsequently, flow path geometry optimization was conducted to maximize the thrust coefficient or net thrust coefficient. The results revealed that the throat area ratio and the outlet area of the ejector nozzle are the primary factors affecting the aerodynamic performance. Compared to the baseline ejector nozzle model, the optimal model for thrust coefficient exhibited a 16.333% improvement, while the optimal model for net thrust coefficient demonstrated a significant enhancement of 46.674%.

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“…Their result shows that with the increase of the area ratio, the flow state of the mixing chamber changes from the under-expansion state to the over-expansion state. Sun et al [7] studied the streamline shape of the primary nozzle and found that the streamlined primary nozzle has better performance than the baseline primary nozzle under some specific operating conditions. Fu et al [8] studied the influence of NXP and mixing chamber throat diameter on the ejector performance.…”

Section: Introductionmentioning

confidence: 99%

Simulation Analysis of Ejector Optimization for High Mass Entrainment under the Influence of Multiple Structural Parameters

et al. 2022

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As an energy-saving technology, the ejector is widely used in the heating, aerospace, and chemical industry. The ejector performance is closely related to its structure, so the structure of the ejector needs to be optimized. In the present study, single-factor optimization is first carried out, and the main structural parameters affecting the ejector performance are screened out. Then, the response surface method is used to analyze the combined effect of the multiple structural parameters of the ejector, find out the optimal structure, and analyze the flow field inside the ejector. This study shows that, through numerical simulation, the ejector performance obtained by the response surface method is better than that obtained by the single-factor optimization method or theoretically designed ejector, and the ejector performance is 35.4% higher than that of the theoretically designed ejector. Moreover, the optimal structure of the ejector obtained by the response surface method has high reliability, and the difference between the simulation result and the prediction result of the response surface method is 0.96%.

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Performance analysis and optimization of a steam ejector through streamlining of the primary nozzle

Cited by 29 publications

References 30 publications

Effect of Superheat Steam on Ejector in Distilled Water Preparation System for Medical Injection

Effect of Superheat Steam on Ejector in Distilled Water Preparation System for Medical Injection

Optimal Design of Ejector Nozzle Profile with Internal and External Integrated Flow

Simulation Analysis of Ejector Optimization for High Mass Entrainment under the Influence of Multiple Structural Parameters

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