Numerical Investigation of the Effect of Air Leaking into the Working Fluid on the Performance of a Steam Ejector

Autor: Jiuxin Ning, Xiaodong Wang, He Li, Pengfei Zhang, Hailong Huang
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Entrainment (hydrodynamics)
Technology
CFD model
QH301-705.5
020209 energy
QC1-999
coefficient distortion rate
02 engineering and technology
Air mass (solar energy)
Computational fluid dynamics
law.invention
020401 chemical engineering
law
0202 electrical engineering
electronic engineering
information engineering
General Materials Science
0204 chemical engineering
Biology (General)
Instrumentation
QD1-999
steam ejector
mixing layer
entrainment ratio
Fluid Flow and Transfer Processes
Internal flow
business.industry
Process Chemistry and Technology
Physics
General Engineering
Refrigeration
Injector
Mechanics
Engineering (General). Civil engineering (General)
Computer Science Applications
air mass fraction
Chemistry
Working fluid
Environmental science
sense organs
TA1-2040
business
Mass fraction
Zdroj: Applied Sciences, Vol 11, Iss 6111, p 6111 (2021)
Applied Sciences
Volume 11
Issue 13
ISSN: 2076-3417
Popis: This paper investigated the effect of air leaking into the working fluid on the performance of a steam ejector. A simulation of the mixing of air into the primary and secondary fluids was performed using CFD. The effects of air with a 0, 0.1, 0.3 and 0.5 mass fraction on the entrainment ratio and internal flow structure of the steam ejector were studied, and the coefficient distortion rates for the entrainment ratios under these air mass fractions were calculated. The results demonstrated that the air modified the physical parameters of the working fluid, which is the main reason for changes in the entrainment ratio and internal flow structure. The calculation of the coefficient distortion rate of the entrainment ratio illustrated that the air in the primary fluid has a more significant impact on the change in the entrainment ratio than that in the secondary fluid under the same air mass fraction. Therefore, the air mass fraction in the working fluid must be minimized to acquire a precise entrainment ratio. Furthermore, this paper provided a method of inspecting air leakage in the experimental steam ejector refrigeration system.
Databáze: OpenAIRE
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