Year: 2025
Type: article
Abstract: This study investigates the influence of back pressure on the mass ejection coefficient (u) of low-pressure methane-air ejectors through a combined approach of one-dimensional mathematical modeling and computational fluid dynamics (CFD) simulations. By establishing a quadratic relationship between u and back pressure (h c ), we reveal three distinct operational regimes: a slow growth phase, a rapid escalation phase, and a critical degradation phase. CFD results validate the theoretical model with a coefficient of determination (R 2 ) of 0.9941 in the quadratic region. A key finding is the identification of a linear correlation between the critical back pressure (h c,crit ) and nozzle pressure (h n ), expressed as h c,crit = − 0.0629 h n + 0.8966 Pa. This work provides actionable guidelines for optimizing ejector geometry and operating conditions in residential gas appliances.
Source: Scientific Reports
Authors: Cong Chen, Haijing Liu, Pengfei Duan
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,690
OpenAlex ID: W4410146470