关键词: 蒸汽喷射器, 螺旋导柱, 数值模拟, 杀菌

Abstract: This paper discussed the applications of paper tube heat exchanger，plate heat exchanger and scraping plate heat exchanger，in order to explore the principles and applications of steam jet device in thermal sterilization for high viscous materials. The velocity field，temperature field and stress field in different steam jet devices were analyzed using Computational Fluid Dynamics (CFD) numerical simulation method. The results showed that the helical guide pillar had a big confluence on the distribution of the velocity field and temperature field in the steam injector. The velocity field and temperature field would have a better distribution when the helical guide pillar was in the center of the dilution zone. Changing the location of the spray-hole was visible to eliminate the “dead zone” in the customary steam injector. The resolving of dead zone will lead to a little increase in transporting power of pump，but the improvement of jet efficiency was more significant than the increase in transporting power of pump. The results could provide necessary theoretical steam injector structure and ejector efficiency improvement .

Key words: steam injector, the helical guide pillar, numerical simulation, sterilization