文档介绍：Applied Thermal Engineering 48 (2012) 237e248
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Applied Thermal Engineering
journal homepage: ate/apthermeng
Configuration dependence and optimization of the entrainment performance
for gasegas and gaseliquid ejectors
Cui Li, Yanzhong Li*, Lei Wang
School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
article info abstract
Article history: This paper describes a numerical study of entrainment behavior and its configuration dependence for
Received 9 March 2011 gasegas and gaseliquid ejectors. putational fluid dynamics (CFD) model is developed and
Accepted 19 November 2011 experimental validation is undertaken over a wide range of operation conditions for ejector with
Available online 26 November 2011
different configurations. The predicted values by CFD simulation prove to be in good agreement with the
experimental data. The investigation results indicate that pseudo-shock length has a dominant effect on
Keywords: entrainment performance and geometry optimization. Significant difference is noted in pseudo-shock
Ejector
length for gasegas and gaseliquid ejectors, and this is mainly because the viscosity similarity mark-
Configuration dependence
e fl
Optimization edly differs within the range of , depending on the primary and secondary uids of usage.
e e
CFD simulation Therefore the optimum mixing tube length to diameter ratio is about 1 2 for general gas liquid ejectors
Pseudo-shock length while 5e7 for gasegas ejectors. As an exception to the general gaseliquid ejectors, the optimum L/D
ratio in HeeLH2 ejector is about 4, lying between that of the gasegas ejector and gaseliquid ejector but
still consistent with the pseudo-shock length. If the maximum allowable length of ejector mixing tube is
less than the optimum value, placing the primary nozzle exit upstream of the mixing tube can greatly
improve the entrainment performance.
Ó 2011 Elsevier L