Research progress on mixing enhancement using streamwise vortices in supersonic flows

Hwang, Byeong-Jo; Min, Seongki

doi:10.1016/j.actaastro.2022.07.055

Cited by 16 publications

(4 citation statements)

References 69 publications

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“…In the case of M ∞ = 5.0, figure 10(a) shows that the streamwise vortex does not collapse (figure 8e) and a bubble structure is not observed because of the absence of a bow shock. The developing process of the vortex is also similar to that in figure 36 of Hwang & Min (2022) in which a ramp strut was used. The crossing of the shock waves is near the RR, and the vortex development demonstrates a high symmetric structure.…”

Section: Interaction Between a Streamwise Vortex And Double Oblique S...mentioning

confidence: 85%

“…2015; Hiejima & Oda 2020). Further, the advantages of strut-type injections with streamwise vortices on supersonic mixing and transition were summarised (Hwang & Min 2022).…”

Section: Introductionmentioning

confidence: 99%

“…Among these devices, the hypermixer struts mounted in the centre of a channel or combustor, which can generate supersonic streamwise vortices, have excellent mixing and combustion capabilities in supersonic flows (Settles 1991;Waitz et al 1997;Gerlinger et al 2008;Burns et al 2011;Fureby et al 2015;Hiejima & Oda 2020). Further, the advantages of strut-type injections with streamwise vortices on supersonic mixing and transition were summarised (Hwang & Min 2022).…”

Section: Introductionmentioning

confidence: 99%

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Streamwise vortex breakdown due to the interaction with crossed shock waves

Hiejima

2023

J. Fluid Mech.

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This paper presents a vortex breakdown study due to the interaction between a Batchelor vortex and the crossing of oblique shock waves with Mach numbers of 3.5 and 5.0, favourable for supersonic mixing and combustion, respectively. Numerical simulations were conducted to investigate the effects of the circulation intensity and shock angle on vortex breakdown. The results indicate that a breakdown occurs at the shock angle $\beta \geqslant 45^\circ$ or the vortex circulation $q = 0.32$ , and the configuration is a bubble structure with a recirculation region; most of the breakdowns possess a stagnation point. Furthermore, the structure differs from that of a normal shock wave and vortex interaction because the bubble region is subsonic and does not comprise a normal shock wave on the inside. Additionally, this vortex breakdown shows that the momentum flux on the centreline decreases once at the tip of the bubble owing to a sudden drop in velocity in the subsonic region. In addition, the enstrophy production resulting from vortex stretching and tilting is found to have a significant advantage in the interaction region. Based on these results, the threshold required for a bubble vortex breakdown was theoretically derived as an inequality. The numerical simulation results support the theoretical criterion obtained from the proposed inequality. Therefore, a streamwise vortex breakdown resulting from the interaction between the vortex and intersecting oblique-shocks should be reasonably predicted.

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Section: Interaction Between a Streamwise Vortex And Double Oblique S...mentioning

confidence: 85%

“…2015; Hiejima & Oda 2020). Further, the advantages of strut-type injections with streamwise vortices on supersonic mixing and transition were summarised (Hwang & Min 2022).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Streamwise vortex breakdown due to the interaction with crossed shock waves

Hiejima

2023

J. Fluid Mech.

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“…Streamwise vortices stimulate mixing by stretching the mean cross-flow interface and increasing the surface area of the convoluted trailing edge of the lobed mixer. It is estimated that streamwise vortices increase mixing enhancements by roughly the same amount as trailing edge length increases mixing enhancement [28]. A high-speed crossflow was injected with an endothermic supercritical hydrocarbon fuel jet, the characteristics of its injection and distribution being analyzed theoretically and experimentally, respectively.…”

Section: Literature Reviewmentioning

confidence: 99%

Performance Analysis of Supersonic Combustion Chamber using Planar-Shaped Strut Injector

Roga

2023

Preprint

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Significant researches have been enthusiastic throughout the last centuries for supersonic and hypersonic flight conditions for enabling flights many times faster than sound. This current work presents the performance analysis of supersonic combustor interface and flow construction through a scramjet engine with a Planar-shaped strut injector (PSSI) at the supersonic Mach. An important aspect of this study is the discovery of the fuel mixing mechanism inside the combustion chamber with PSSI. Mixing and combustion performance can be enhanced by the novel PSSI configuration. The scramjet configuration is incorporated with the supersonic inlet air temperature of 1250 K, where the vitiated air follows at Mach 3, and this technique is based on a high accelerating effect of scramjet propulsion mechanism. Scramjet engines can maintain a naturalistic high enthalpy conditions in minimum durations. It is observed that the maximum temperature of 3510 K is attained at the recirculating zones that are produced because of undulation enlargement and therefore the fuel jet losses concentration whereas the maximum combustion efficiency of 86% is investigated from the current research work.

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