期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2014
卷号：3
期号：12
页码：18311
DOI：10.15680/IJIRSET.2014.0312076
出版社：S&S Publications
摘要：This work focuses on the numerical simulation of the working of a steam ejector in order improve theperformance. Computational Fluid Dynamics (CFD) was employed for the numerical simulation. In this work theeffect of operating conditions on the performance of the steam ejector operating in conjunction with anejector refrigeration cycle was considered along with the effect of geometry parameter. The model and meshing isdone with GAMBIT and FLUENT solver is used for the analysis. The simulations are performed with differentoperating conditions and geometries. The entrainment ratio is found to increase with the decrease of boiler saturationtemperature for the same condition of superheat, evaporator temperature and condenser pressure. The entrainment ratiois also found to increase with increase of evaporator temperature keeping the boiler temperature and condenserpressure constant. The entrainment ratio does not vary much with the condenser pressure until the critical condenserpressure. It is also found that the entrainment ratio increases with decrease of throat diameter of the primary nozzle.The increase of entrainment ratio can be found out from the moving downwards of the effective position. But, a largermass of secondary fluid causes the momentum of the mixed stream to decrease. The decrease of momentum can bedetermined from the moving upstream of the shocking position. The movement of shocking position upstream cancause the ejector to operate at a lower critical condenser pressure.
