Parametric study of a mixer/ejector nozzle with mixing enhancement devices

DalBello, T.; Steffen, Christopher J.

doi:10.2514/6.2002-667

Cited by 2 publications

(1 citation statement)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Results showed that the central plug increased the pumping ratio about 60-70% and the total pressure prior to flow entry into circularly lobed nozzle increased about 0.8-1.0% over the same lobed nozzle without a central plug. Besides, some researchers had made investigations on the applications of lobed mixer-ejector [33][34][35][36][37][38]. It is noticed that the above investigations on the mixer-ejector are featured to the straight mixing ducts.…”

Section: Introductionmentioning

confidence: 98%

Parametric Effects on Internal Aerodynamics of Lobed Mixer-Ejector With Curved Mixing Duct

Pan

Shan

Zhang

2014

Journal of Engineering for Gas Turbines and Power

View full text Add to dashboard Cite

The internal flow characteristics inside lobed mixer-ejector with curved mixing duct and the parametric effects on the lobed mixer-ejector performance are investigated numerically and validated by experimental test. The cwved mixing duct ajfects the development of the streamwise vortices induced by the lobed mixer. When the mixing process undergoes the transition from the straight section to the bent section, the flow inside the cwved mixing duct is dominated by the impinging and centrifugal ejfects. In general, the pumping ratio is decreased approximately 20%-30% once the bent section is mounted on the straight duct. The mixer-ejector performance could by improved by increasing the straight section length, due to more fully momentum utilization of primary jet and weaker influence of bent section on the back pressure near nozzle exit. The mixer-ejector pumping capacity is also augmented with the increase of mixing duct area ratio until the area ratio is reached to 3.5. And the fully-utilization of primary jet momentum inside mixing duct with big area ratio needs long mixing distance. The pumping ratio is decreased as the increase of bent angle of curved mixing duct in approximately linear relationship. When the bent angle exceeds 45 deg, the thermal mixing efficiency is decreased rapidly as the increase of bent angle.

show abstract