DAI Zhengshu, CHEN Guangming, ZHANG Hua. Theoretical analysis on impact of irreversibility on ejector performance[J]. CIESC Journal, 2016, (S2): 78-86.
Ejector is the key component of ejector refrigeration system.Its performance is directly of relevance to the system efficiency.In the present work
a new theoretical model is proposed to analyze the impact of internal irreversibility of the ejector on its performance
including entrainment ratio
ejector efficiency and ejector back pressure.In the proposed model
real gas characteristic is used
and the existence of two phases is also considered for the prediction of ejector performance.Results show that the irreversibility of primary flow through the converging-diverging nozzle and the irreversibility of secondary flow expansion in suction chamber have great impact on entrainment ratio
the irreversibility of mixed flow in mixing chamber and diffuser almost has little influence on the entrainment ratio.And with the decrease of the internal irreversibility in each part of the ejector
ejector efficiency increases and the ejector back pressure increases as well.