Influence of jet parameters of fluidic oscillator-type fuel injector on the mixing performance in a supersonic flow field

Numerical analyses are performed to clarify the influence of jet parameters, i.e., the sweeping jet angle and oscillation frequency, of a fluidic oscillator on the mixing performance. Specifically, hydrogen is injected into the supersonic freestream through a fluidic oscillator, and the corresponding mixing performance is evaluated. The mixing performance evaluated is penetration length, area of a flammable region, and mixing efficiency. In all cases, the fluidic oscillator has better mixing performance than a steady transverse jet. The results show that the influence of the sweeping jet angle on the mixing performance is more notable than that of the oscillating frequency. At 58 and 580 Hz frequency, 24 degrees has the highest penetration length ratio and largest area of the flammable region. The tendency of the mixing efficiency ratio depending on the sweeping angle at low frequencies is unclear. At high frequencies, 24 degrees has the biggest mixing efficiency and largest area of the flammable region, whereas 18 degrees has the highest penetration length ratio. The results showed that the appropriate combination of the frequency and sweeping jet angle to maximize the mixing performance.(c) 2023 Elsevier Masson SAS. All rights reserved.