Mixing Enhancement in a Scramjet Combustor Using Fuel Jet Injection Swirl.

Flesberg, Sonja M.

doi:10.2514/6.2018-5381

Cited by 2 publications

(1 citation statement)

References 48 publications

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“…There are three types that can be identified of stream swirl, when the swirl number (S<0.6) it's called the weak swirl, (S=0.6) is called the critical swirl and (S>0.6) is called the strong swirl [34,35].…”

Section: Swirl Flow Characterizationmentioning

confidence: 99%

Flame Stability in Swirling and Bluff-Body Burners: A Review

Shakir Mahmood,

Saleh

2023

Jurnal Teknologi

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Flame stability is one of the main challenges facing the different combustion applications. A lot of undesirable phenomena such as blow-off and flashback may occur according to the instability of the flame causing damage to the overall combustion system. Therefore, it is necessary to develop methods which help improve the combustion process and obtain wider flame stable regions. Among these methods, swirling flows and bluff-bodies are the most commonly used in flame stabilization. These may create central recirculation zones (CRZ’s) that, in turn, recirculate the heat and active chemical species to the root of flame, improving the reactants mixing and as a result, flame stability. Hence, the current article presents an overview of flame stability mechanisms and the operation map using swirling flows and bluff-bodies. The effect of the swirl number (S) and burner’s geometry, as well as the influence of the bluff-body shape, size and position on the flame stabilization mechanisms are discussed.

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Section: Swirl Flow Characterizationmentioning

confidence: 99%

Flame Stability in Swirling and Bluff-Body Burners: A Review

Shakir Mahmood,

Saleh

2023

Jurnal Teknologi

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Flow control effect of pulsed arc discharge plasma actuation on impinging shock wave/boundary layer interaction

Fan²,

et al. 2023

Physics of Fluids

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The current study investigates the control effect of the pulsed arc discharge plasma (PADP) on the impinging shock wave and boundary layer interaction (SWBLI) generated by a 14{degree sign} wedge in a Mach 2.5 flow. The response characteristics of SWBLI on pulsed arc discharge (PAD) actuation were illustrated, and the controlling mechanism of shock-induced flow separation under different plasma power settings was revealed. The results showed that when setting the exciting power density ph as 1.0×1011 W/m3, the oblique shock wave obtained an obvious fluctuation, and the foot of the reattachment shock wave was partially removed. In addition, as the controlling gas bubble (CGB) passed through the interaction region, the reverse flow zone was enlarged, and the separation shock wave was shifted upward. When ph was set to 4.8 × 109 W/m3, the flow separation induced by SWBLI was effectively suppressed and the size of the reverse flow zone was significantly reduced. Moreover, as the energy input was increased, the arc-induced blast wave (BW) velocity was obviously enhanced. Additionally, it is further found that the arc plasma energy deposition (APED) density in discharge region was the determining factor for SWBLI control, even for a relatively small exciting energy input. Better drag reduction of the flow field would be achieved with PADP of higher power density, and a drag reduction rate of nearly 10.05 % was obtained at ph = 1 × 1011 W/m3 control condition.

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Mixing Enhancement in a Scramjet Combustor Using Fuel Jet Injection Swirl.

Cited by 2 publications

References 48 publications

Flame Stability in Swirling and Bluff-Body Burners: A Review

Flame Stability in Swirling and Bluff-Body Burners: A Review

Flow control effect of pulsed arc discharge plasma actuation on impinging shock wave/boundary layer interaction

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