Modeling of a Feedback Mechanism in Supersonic Deep-Cavity Flows

Handa, Taro; Miyachi, Hiroaki; Kakuno, Hatsuki; Ozaki, Takaya; Maruyama, Shinji

doi:10.2514/1.j053184

Cited by 19 publications

(17 citation statements)

References 10 publications

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“…Tam et al [4] proposed to take into account flow characteristics including the shear layer thickness, and the a small number of acoustics reflections, agreeing well with the experimental frequencies. Handa et al [5] developed a model for the acoustic feedback mechanism based on superposition of two reflected waves. Their results predicted well the tonal frequencies of deep cavity flows.…”

Section: Introductionmentioning

confidence: 99%

Acoustic field around a transonic cavity flow

Loupy

Barakos

Kusyumov³

2017

International Journal of Aeroacoustics

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This paper describes new techniques for analysing cavity flows. The beamforming method is used to estimate the pressure fluctuations inside a resonant transonic cavity, highlighting the localisation of the sources of noise. The method produces insightful results and only requires the use of an acoustic array and a mean flow-field. The technique models the noise propagation in a simple and efficient way, applicable for wind tunnel test. In addition, this paper discusses the generation of the cavity tones. CFD results are analysed using a superposition of reflected acoustic waves driven by the cavity flow. This analysis shows that the time averaged flow-field drives the frequencies of the tones, while the flow-field fluctuations drive their amplitude. In addition, the tonal dynamics of the cavity flow are represented by a simple model with standing wave oscillations and their modulation. This work is complementary to the well established Rossiter cavity model.

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Section: Introductionmentioning

confidence: 99%

Acoustic field around a transonic cavity flow

Loupy

Barakos

Kusyumov³

2017

International Journal of Aeroacoustics

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“…Tam et al [3] proposed an other model taking into account more flow characteristics including the shear layer thickness, and the acoustics reflections, agreeing well with the experiments. Handa et al [4] developed a feedback mechanism model for deep cavity flow based on the superposition of reflected waves, agreeing better than Rossiter formula for this type of cavity. However, the previous models for cavity do not predict the relative amplitude of the tones, and not accurately predict the number of modes, while experiments and CFD show a finite number of modes, and large tone variations depending on the conditions, and the geometry.…”

Section: Standing Waves Modelling Of Transonic Shallow Cavity Flowsmentioning

confidence: 88%

Modelling of Transonic Shallow Cavity Flows

Loupy

Barakos

2017

35th AIAA Applied Aerodynamics Conference

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“…Currently, cavities are widely investigated on the feedback mechanism [34][35][36] , especially they have been successfully used as flameholders in supersonic combustors due to their outstanding potential to stabilize combustion by cavity oscillations [37][38][39][40] . However, they have not been tried so far associated with detonation combustion in supersonic combustible mixtures.…”

Section: Introductionmentioning

confidence: 99%

Adaptive simulations of cavity-based detonation in supersonic hydrogen–oxygen mixture

Cai

Liang

Deiterding

et al. 2016

International Journal of Hydrogen Energy

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Two-dimensional reactive Euler equations with a detailed reaction modelwhere the molar ratio of the combustible mixture H2/O2/Ar is 2:1:7 under the condition of pressure 6.67 kPa and temperature 298 K, are solved numerically with adaptive mesh refinement method to investigate detonation combustion using a hot jet initiation in cavity-based channels filled with the supersonic combustible mixture.Results show that from the comparison between the simulations in a cavity-based channel and a straight channel without any cavity embedded, it is indicated that the cavity can help realize detonation initiation in the combustible mixture with a hot jet.It is suggested that detonation initiation can be realized using a relatively weaker hot jet in cavity-based channels filled with the supersonic combustible mixture compared with that in straight channels without a cavity embedded. The cavity also plays a significant role in detonation propagation in the supersonic combustible mixture.After the hot jet is shut down, the acoustic wave generated by the subsonic combustion in the cavity can accelerate detonation propagation through a subsonic Corresponding author. Email addresses: cai-chonger@hotmail.com, jhleon@vip.sina.com, r.deiterding@soton.ac.uk, linzy96@nudt.edu.cn, channel and result in the formation of a slightly overdriven detonation eventually. For a given flow with a shadow cavity embedded, there should exist a minimum cavity width Lmin. When the width is below Lmin, only some pressure oscillations in the cavity can make some impacts on detonation initiation and propagation. Otherwise, cavity oscillations can be generated which can greatly accelerate detonation initiation and propagation in the supersonic combustible mixture. For the shadow cavity, purely increasing the cavity depth does not have any more influence on detonation combustion. However, if the cavity is a deep one, it can play an important role in accelerating detonation initiation and propagation in the supersonic combustible mixture due to resonant oscillations.

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Modeling of a Feedback Mechanism in Supersonic Deep-Cavity Flows

Cited by 19 publications

References 10 publications

Acoustic field around a transonic cavity flow

Acoustic field around a transonic cavity flow

Modelling of Transonic Shallow Cavity Flows

Adaptive simulations of cavity-based detonation in supersonic hydrogen–oxygen mixture

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