Accurate condensing steam flow modeling in the ejector of the solar-driven refrigeration system

Zhang, Guojie; Dykas, Sławomir; Li, Pan; Li, Hang; Wang, Junlei

doi:10.1016/j.energy.2020.118690

Cited by 53 publications

(14 citation statements)

References 38 publications

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“…Figure 6 illustrates the relative error of P d * of the different turbulence models. The P d * predicted by the seven models are all below the experimental data, which is consistent with the findings of the majority of scholars [ 9 , 19 , 28 , 29 , 30 , 31 ]. The relative errors of the k-ω Standard, k-ω SST, and k-ε Realizable model which are all below 20% are acceptable.…”

Section: Resultssupporting

confidence: 90%

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

Niu

Shen

et al. 2022

Entropy

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Scholars usually ignore the non-equilibrium condensing effects in turbulence-model comparative studies on supersonic steam ejectors. In this study, a non-equilibrium condensation model considering real physical properties was coupled respectively with seven turbulence models. They are the k-ε Standard, k-ε RNG, k-ε Realizable, k-ω Standard, k-ω SST, Transition SST, and Linear Reynolds Stress Model. Simulation results were compared with the experiment results globally and locally. The complex flow phenomena in the steam ejector captured by different models, including shock waves, choking, non-equilibrium condensation, boundary layer separation, and vortices were discussed. The reasons for the differences in simulation results were explained and compared. The relationship between ejector performance and local flow phenomena was illustrated. The novelty lies in the conclusions that consider the non-equilibrium condensing effects. Results show that the number and type of shock waves predicted by different turbulence models are different. Non-equilibrium condensation and boundary layer separation regions obtained by various turbulence models are different. Comparing the ejector performance and the complex flow phenomena with the experimental results, the k-ω SST model is proposed to simulate supersonic steam ejectors.

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Section: Resultssupporting

confidence: 90%

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

Niu

Shen

et al. 2022

Entropy

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“…They found that the values of Mach number and pressure just behind the Mach disk are affected by the use of real gas equations. Therefore, a condensation model that includes real physical properties that can accurately capture the complex flow phenomenon inside the steam ejector is essential [20].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Different Pressure Conditions on Shock Waves in a Supersonic Steam Ejector

Shen

Niu

et al. 2022

Energies

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The complex flow phenomena in a three-dimensional supersonic steam ejector were simulated with a non-equilibrium condensation model including real physical properties in different pressure conditions. The different working conditions include discharge pressure, motive pressure, and suction pressure. The influence of different pressures on shock waves in the steam ejector was investigated comprehensively. The intrinsic causes of shock wave variation with pressure conditions were explained in detail. The results show that the width of the primary shock train region expand with an increase in the motive pressure or a decrease in suction pressure. The diamond shock waves move downstream with an increase in motive pressure or a decrease in suction pressure. The shocking position in the diffuser moves upstream until it reaches the diffuser entrance with an increase in discharge pressure or a decrease in motive pressure or suction pressure. The intensity and number of oblique shock waves in the diffuser increase with an increase in motive pressure and suction pressure or a decrease in discharge pressure. The existence of only one shock wave in the diffuser is a necessary and insufficient condition for the ejector to enter a double choking mode.

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“…The liquid mass fraction, which could impact the measuring accuracy, has been stated to be predominantly determined by non-equilibrium condensations [14,15]. In addition, greater the degree of expansion, the greater the non-equilibrium condensate and a greater lack of irreversibility [16][17][18][19], as well as loss due to friction could affect the end results. The precise flow field prediction is therefore necessary to interpret the test results.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of probe parameters on performance of a transonic axial compressor

Islam

2021

PLoS ONE

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The paper shows the effect of the probe on the performance of a transonic axial speed compressor. The unobstructed flow case with the experimental data was validated and used as a guide for all subsequent study cases. The aerodynamic performance for different probe parameters were calculated numerically using ANSYS-CFX. This covered the results on compressor output from changing probe axial positions, the radial immersion depths, the size of the probe, and the total number of probes. The findings were evaluated in relation to the total pressure ratio, performance, margin of deflation and stability. The velocity part distributions further showed that the probe block and raises the flow Mach value, which is the explanation why the compressor rotor’s total pressure ratio is lost. In fact, the parameters of the sample will significantly influence the calculation outcomes and affect the standard margin. The range of stability was also affected, which changes the performance trend from the choke to the stall. Consequently, the collection of correct probe parameters with fewer impact on compressor output is addressed.

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Accurate condensing steam flow modeling in the ejector of the solar-driven refrigeration system

Cited by 53 publications

References 38 publications

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

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

The Effect of Different Pressure Conditions on Shock Waves in a Supersonic Steam Ejector

Numerical study of probe parameters on performance of a transonic axial compressor

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