Open AccessNumerical investigation on the effect of second throat diameter on two-throat nozzle ejector
Author(s) -
Fatong Jia,
Dan Yang,
Jing Xie
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2047/1/012020
Subject(s) - throat , injector , nozzle , mechanics , entrainment (biomusicology) , materials science , flow (mathematics) , mixing (physics) , mechanical engineering , thermodynamics , physics , engineering , medicine , acoustics , surgery , quantum mechanics , rhythm
The employment of two-phase ejectors in the CO 2 refrigeration systems is widely developed recently. Due to the lack reports on the two-throat nozzle ejectors, the performance of CO 2 two-throat nozzle ejector varied with different second throat diameter ( D t ) was numerically investigated under different primary pressures ( P p ). The accuracy of established numerical simulation model was confirmed with the assistance of experimental data summarized in the literature. The simulated results show that the two-throat nozzle ejector performance corresponding to entrainment ratio ( Er ) is of better stability with relatively bigger D t under different working conditions. Next, the axial static pressure corresponding to bigger D t is lower than that of smaller one at pre-mixing chamber. And the secondary flow velocity of bigger D t is accelerated better as compared to that of smaller one.