Numerical study on the impact of needle and dryness fraction on two-phase ejector performance under fixed/varied operating pressure
Year: 2024
Type: article
Abstract: This study investigates the effects of varying needle block degree (blockage area ratio of the primary nozzle throat) and dryness fraction (the ratio of gas mass to mass of two-phase mixture) within the primary and secondary flow on the performance of a two-phase ejector, employing CFD numerical simulations under both fixed and varied conditions. The findings reveal the following: (1) Dryness fraction has a significant impact on the performance of the ejector. ER decreases with the decrease of X1 and increases with the decrease of X2, when X1 = 1 and X2 = 0.4, the ejector performance can be improved by 253.3 % under the optimal area ratio; (2) A higher primary flow dryness fraction and a lower secondary flow dryness fraction are more favorable for enhancing the ejector's performance; (3) When P1 changes, the ejector is most sensitive to changes in P1, slightly less sensitive to changes in An, and least sensitive to changes in dryness fraction; When P2 changes, the ejector is most sensitive to changes in dryness fraction, slightly less sensitive to changes in P2, and least sensitive to changes in An; (4) When varying P1 and P2, the ejector performance is optimal at X1 = 1 and X2 = 0.8 (An); (5) Regardless of changes in AR or operating conditions, the adjustable ejector with the needle can effectively enhance the ejector's performance under certain conditions.
Authors: Meiqi Qin, Jia Yan, Ruixin Li
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,210
Award: G6419920333
OpenAlex ID: W4401659015