Supersonic mixing enhanced by cavity-induced three-dimensional oscillatory flow

Handa, Taro; Nakano, Aoi; Tanigawa, Kazuya; Fujita, Jun

doi:10.1007/s00348-014-1711-y

Cited by 24 publications

(14 citation statements)

References 18 publications

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“…For all three physical models, injection ports of 1.5 mm diameter are located 22 mm downstream of the entrance of the divergence section, and the distance between two injectors is 12 mm. These specifications are the same as those employed by Handa et al (2014).…”

Section: Physical Modelmentioning

confidence: 90%

“…They observed that the spreading of a cavity actuated mixing layer was much higher than that of an ordinary mixing layer for the same velocity and density ratios. Handa et al (2014) experimentally compared supersonic mixing fields in three ducts without any devices, with a rectangular cavity, or with the proposed cavity. They found that mixing, as well as jet penetration, was enhanced far more rapidly in the duct with the proposed cavity.…”

Section: Introductionmentioning

confidence: 99%

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Supersonic mixing augmentation mechanism induced by a wall-mounted cavity configuration

Huang

Ding

et al. 2016

JZUS-A

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Abstract:An efficient mixing process is very important for the engineering implementation of an airbreathing propulsion system. The air and injectant should be mixed sufficiently before entering the combustor. Two new wall-mounted cavity configurations were proposed to enhance the mixing process in a conventional transverse injection flow field. Their flow field properties were compared with those of a system with only transverse injection ports. Grid independency analysis was used to choose a suitable grid scale, and the mixing efficiencies at four cross-sectional planes (namely x=20, 40, 60, and 80 mm, which are just downstream of the jet orifice) were compared for the configurations considered in this study. The results showed that hydrogen penetrated deeper when a cavity was mounted upstream of the transverse injection ports. This is beneficial to the mixing process in supersonic flows. The mixing efficiency of the configuration with the wall-mounted cavity was better than that of the conventional physical model, and the mixing efficiency of the proposed novel physical model I (98.71% at x=20 mm) was the highest of all. In the case with only transverse injection ports, the vortex was broken up by the strong interaction between the shear layer over the cavity and the jet.

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Section: Physical Modelmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Supersonic mixing augmentation mechanism induced by a wall-mounted cavity configuration

Huang

Ding

et al. 2016

JZUS-A

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“…Hence, in this study, we show the pressure oscillation spectra at only location . Several studies [2,10] demonstrated that the injection just downstream of the cavity was effective in the enhancement of supersonic mixing. Information about the pressure oscillation at location might give significance to the mixing enhancement.…”

Section: Methodsmentioning

confidence: 99%

“…Cavity-induced pressure oscillations cause structural fatigue and sound noise. On the other hand, such oscillations are advantageous in the enhancement of supersonic mixing [1,2]; that is, the injectant is subjected to disturbances such as pressure waves or a pulsating flow generated by a cavity-induced flow oscillation. A linear stability analysis provides the principle in which the growth rate of a supersonic shear-layer depends on the frequency of the disturbance imposed on the shear layer [3].…”

Section: Introductionmentioning

confidence: 99%

Frequencies of Transverse and Longitudinal Oscillations in Supersonic Cavity Flows

Handa

Tanigawa

Kihara

et al. 2015

International Journal of Aerospace Engineering

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A supersonic flow over a rectangular cavity is known to oscillate at certain predominant frequencies. The present study focuses on the effect of the cavity length-to-depth ( / ) ratio on the frequency for a free-stream Mach number of 1.7. The pressure oscillations are measured by changing the / ratio from 0.5 to 3.0, and the power spectral density is calculated from the temporal pressure signals for each / ratio. The results demonstrate that the spectral peaks for an / ratio of less than ∼1 and greater than ∼2 are accounted for by the feedback mechanisms of the transverse and longitudinal oscillations, respectively. The results also demonstrate that the spectral peaks in the transition (1 <∼ / <∼ 2) are accounted for by either of the two feedback mechanisms of transverse and longitudinal oscillations; that is, the flows under the transition regime oscillate both transversely and longitudinally.

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“…Recently, one of the authors proposed a novel wall-mounted cavity having a three-dimensional shape as shown in Fig. 1 16) . This cavity induces not only secondary flows but also pressure disturbances, both of which are advantageous in supersonic mixing and cannot be induced in any other previous devices.…”

Section: Introductionmentioning

confidence: 99%

Steady-state Analysis of Supersonic Mixing Enhanced by a Three-dimensional Cavity Flow

et al. 2017

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The supersonic mixing field induced by a novel wall-mounted cavity having a three-dimensional shape is investigated computationally. In the computation, the Reynolds-averaged Navier-Stokes (RANS) equations are solved to obtain the steady state solution. The resulting pattern of limiting streamlines is compared with the previous result of oil-flow surface visualization. The comparison shows that the pattern of limiting streamlines agrees well with the oil flow pattern not only inside the cavity but also around the injector. The computational jet-penetration heights are also compared with the experimental heights measured previously. The comparison shows that both heights agree well near the injector. Such agreements imply that the flows in the cavity and around the injector can be reproduced well by the present numerical simulation. The detailed flow structure is investigated using the computational results. It is found from the results that a vortex having a three-dimensional shape is produced in the cavity and that the shear-layer spanning the cavity deflects upward near the central plane of the duct owing to the upward flows induced by the vortex. It is also found that owing to the upward shear-layer deflection the jet discharged from the injector is protected from the primary flow having large momentum. As a result, the jet penetrates highly into the primary flow.

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Supersonic mixing enhanced by cavity-induced three-dimensional oscillatory flow

Cited by 24 publications

References 18 publications

Supersonic mixing augmentation mechanism induced by a wall-mounted cavity configuration

Supersonic mixing augmentation mechanism induced by a wall-mounted cavity configuration

Frequencies of Transverse and Longitudinal Oscillations in Supersonic Cavity Flows

Steady-state Analysis of Supersonic Mixing Enhanced by a Three-dimensional Cavity Flow

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