Entropy Production Analysis of Steam Ejector under Typical Working Conditions

The clocking effect between the inducer and the impeller has a certain impact on the performance of the high-speed centrifugal pump, which however, is often ignored by designers. In the present study, three-dimensional numerical simulation based on Reynolds-averaged Navier–Stokes method is adopted to evaluate the influence of this clocking effect on the performance of a full-scale liquid rocket engine oxygen turbopump. A novel entropy production method with the correction of wall effects was introduced to evaluate the energy loss generated in the pump and to clarify the formation mechanism of this clocking effect from the perspective of the second law of thermodynamics. Results show that the best performance is captured when the relative circumferential angle between the inducer blade trailing edge and the impeller blade leading edge was set as 0° and the maximum difference in pump efficiency is approximately 1.5% at different clocking positions. The entropy production analysis of each component of the pump reveals that the clocking effect on the pump performance mainly originates from the turbulent dissipation in the impeller and the diffuser. The study of the local entropy production rate and the streamline distributions shows that the formation of this clocking effect is owing to the different extent of the separation vortices in the impeller passage near the shroud and the impeller blade wake in the diffuser inlet as well as the backflow vortices in the diffuser blade passage near the volute tongue.

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Investigation on inner flow quality assessment of centrifugal pump based on Euler head and entropy production analysis

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/240/9/092001 ◽

2019 ◽

Vol 240 ◽

pp. 092001 ◽

Cited By ~ 2

Author(s):

Bo Qian ◽

Jin-Ping Chen ◽

Peng Wu ◽

Da-zhuan Wu ◽

Peng Yan ◽

...

Keyword(s):

Quality Assessment ◽

Entropy Production ◽

Centrifugal Pump ◽

Production Analysis ◽

Flow Quality

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Entropy production analysis for hump characteristics of a pump turbine model

Chinese Journal of Mechanical Engineering ◽

10.3901/cjme.2016.0414.052 ◽

2016 ◽

Vol 29 (4) ◽

pp. 803-812 ◽

Cited By ~ 24

Author(s):

Deyou Li ◽

Ruzhi Gong ◽

Hongjie Wang ◽

Gaoming Xiang ◽

Xianzhu Wei ◽

...

Keyword(s):

Entropy Production ◽

Pump Turbine ◽

Production Analysis ◽

Hump Characteristics ◽

Turbine Model

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Entropy production analysis for vortex rope of a Francis turbine using hybrid RANS/LES method

International Communications in Heat and Mass Transfer ◽

10.1016/j.icheatmasstransfer.2021.105494 ◽

2021 ◽

Vol 127 ◽

pp. 105494

Author(s):

Zhi-Feng Yu ◽

Yan Yan ◽

Wen-Quan Wang ◽

Xing-Shun Liu

Keyword(s):

Entropy Production ◽

Francis Turbine ◽

Vortex Rope ◽

Production Analysis

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Entropy production analysis of hysteresis characteristic of a pump-turbine model

Energy Conversion and Management ◽

10.1016/j.enconman.2017.07.024 ◽

2017 ◽

Vol 149 ◽

pp. 175-191 ◽

Cited By ~ 76

Author(s):

Deyou Li ◽

Hongjie Wang ◽

Yonglin Qin ◽

Lei Han ◽

Xianzhu Wei ◽

...

Keyword(s):

Entropy Production ◽

Pump Turbine ◽

Hysteresis Characteristic ◽

Production Analysis ◽

Turbine Model

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Entropy production analysis for mechanism reduction

Combustion and Flame ◽

10.1016/j.combustflame.2013.12.016 ◽

2014 ◽

Vol 161 (6) ◽

pp. 1507-1515 ◽

Cited By ~ 19

Author(s):

Mahdi Kooshkbaghi ◽

Christos E. Frouzakis ◽

Konstantinos Boulouchos ◽

Ilya V. Karlin

Keyword(s):

Entropy Production ◽

Mechanism Reduction ◽

Production Analysis

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The Fundamental Principles of the Steam Ejector

Proceedings of the Institution of Mechanical Engineers ◽

10.1243/pime_proc_1941_145_041_02 ◽

1941 ◽

Vol 145 (1) ◽

pp. 193-209 ◽

Cited By ~ 4

Author(s):

R. Royds ◽

E. Johnson

Keyword(s):

Working Conditions ◽

Air Flow ◽

Critical Value ◽

Experimental Results ◽

Maximum Efficiency ◽

Outlet Pressure ◽

Steam Ejector ◽

Predominant Effect

The main purpose of this paper has been to express experimental results in a form which reveals the fundamental principles for application to the design of ejectors. Notwithstanding the large losses of work energy in the nozzle, combining cone, and diffuser, the diffuser was found to obey the same laws of discharge as in convergent nozzles, although with a different constant. At the best nozzle settings, if P is the ejector outlet pressure, the position at which the pressure reached the adiabatic critical value P c = 0·55 P occurred at nearly the same point in the diffuser at maximum efficiency for wide variations in the working conditions, and for different forms of combining cone and diffuser throat. Also, the calculated area a c of the stream at this point was practically independent of the same factors. The position of the mouth of the nozzle had a predominant effect on the performance and efficiency, and the best nozzle positions were found to be nearly independent of the dimensions of the nozzle, the weight of steam and air flow, and the dimensions or form of the combining cone and of the diffuser throat.

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