Numerical simulation reveals an 18.8% increase in entrainment ratio alongside reduced critical back pressure in supersonic ejectors, indicating a trade-off between efficiency and stability.
Key Points
To investigate internal flow characteristics and optimize the geometric dimensions of a supersonic ejector under fixed operating conditions.
Validated a computational fluid dynamics (CFD) model against published experimental data.
Conducted single-factor geometric analyses followed by multi-factor optimization using an orthogonal test method under fixed operating conditions.
Geometric optimization increased the ejector entrainment ratio from 0.442 to 0.526, reflecting an 18.8% improvement.
Critical back pressure decreased from 217.2 kPa to 206.2 kPa (a 5.04% reduction), demonstrating a performance trade-off between entrainment capacity and operating stability.