Effect of Distributed Fuel Injection on Model Scramjet Combustor Performance

Kanapathipillai, Mithuun; Chang, Minwook; Yu, Andrew; Aguilera, Camilo; Yu, Kenneth H.

doi:10.2514/6.2020-3723

Cited by 4 publications

(1 citation statement)

References 12 publications

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“…Some scholars have explored the synchronized injection in upstream and downstream injection scheme of the cavity. Kanapathipillai's [1] research shows that by controlling the distribution of fuel injection equivalence ratio, the transition between the supersonic and subsonic modes of the engine can be controlled, and the influence of combustion instability can be minimized. Gruber and Smith [2] studied the synchronized upstream and downstream injection method in axisymmetric scramjet engines, and the results showed that increasing the fuel injection in the upstream combustion chamber improved the performance, but reduced the isolation section margin, requiring a balance between the two.…”

Section: Introductionmentioning

confidence: 99%

Research on the combustion organization mechanism of synchronized injection in the upstream and downstream of the cavity in scramjet

Li,

Jin

et al. 2024

J. Phys.: Conf. Ser.

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This investigation presents experimental study on the synchronized fuel injection scheme of the upstream and downstream in cavity under the supersonic inflow condition of Mach 2.92, revealing the combustion organization mechanism of the synchronized injection in the scramjet. The results show that under the same global equivalence ratio, synchronized injection in the upstream and downstream of the cavity plays an important role in reducing ignition delay, combustion oscillation, and improving flame stability. The combustion of the downstream jet can promote the combustion inside the cavity, especially at the rear edge of the cavity, while the upstream jet can provide a large amount of high-temperature products and free radicals for the downstream jet, greatly promoting the combustion process of the downstream jet.

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Section: Introductionmentioning

confidence: 99%

Research on the combustion organization mechanism of synchronized injection in the upstream and downstream of the cavity in scramjet

Li,

Jin

et al. 2024

J. Phys.: Conf. Ser.

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Combustion

Bruno

2023

Airbreathing Hypersonic Propulsion

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Instability of isolator shocks to fuel flow rate modulations in a strut-stabilised scramjet combustor

Kumar,

Ghosh

2024

Aeronaut. j.

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Reynolds-Averaged Navier–Stokes (RANS) simulations, both steady and unsteady, are used to investigate supersonic, chemically reacting, flow fields inside a strut-stabilised supersonic combustion ramjet (scramjet) engine operating under different fuel flow rates. Fully supersonic, fully subsonic and mixed modes of operations inside the combustor, obtained at different fuel flow rates, are studied numerically through shock wave visualisations and top-wall static-pressure probing. The effect of changing fuel flow rates, imposed both suddenly and gradually, on the behaviour of shock waves and wall pressure profiles are studied in detail. For certain modes of combustion characterised by the presence of oblique shocks at the strut, shockwaves in the combustor respond predictably to an increase or decrease in fuel flow rate attaining the steady state flow fields as predicted by RANS simulations for those fuel flow rates. For certain other modes of combustion, characterised by the presence of shockwaves in the isolator and the absence of oblique shocks at the leading edge of the strut, shockwaves in the flow field appear unstable to fuel flow rate modulations. For such cases, any change in fuel flow rates, sudden or gradual, increase or decrease, causes the isolator shocks to immediately move upstream and eventually out of the isolator. A plausible physics-based explanation of the observed phenomena is presented.

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Effect of Distributed Fuel Injection on Model Scramjet Combustor Performance

Cited by 4 publications

References 12 publications

Research on the combustion organization mechanism of synchronized injection in the upstream and downstream of the cavity in scramjet

Research on the combustion organization mechanism of synchronized injection in the upstream and downstream of the cavity in scramjet

Combustion

Instability of isolator shocks to fuel flow rate modulations in a strut-stabilised scramjet combustor

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