Study on two-phase flow dynamics in steam injectors Original Research Article

A steam injector is a simple, compact, passive steam jet pump for water injection or the primary loop recirculation system. An analytical study has been conducted on a large-scale steam injector for a next-generation reactor, in order to check the feasibility of a large-scale steam injector for which a demonstration test was not able to be conducted at present. Visualized fundamental tests were conducted in order to develop separate two-phase flow models to be installed in the PHOENICS Code. The models were verified by using high-pressure steam test data, as well as the visualized data. Then the large-scale injectors analyses were conducted using the newly developed models. The analysis results showed that the large-scale steam injector could work in the high-pressure range and discharged over 12 MPa, even at the rated flow rate of 61 kg s−1 (220 ton h−1).