Numerical study on supersonic internal cavity flows - What causes the pressure fluctuations?

Takakura, Yoko; Suzuki, Takayoshi; Higashino, Fumio; Yoshida, Masahiro

doi:10.2514/6.1999-545

Cited by 5 publications

(8 citation statements)

References 4 publications

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“…As seen from this figure, the simulated results are much closer to those obtained by Nishioka et al [5]. : Experimental [17] [18] : Theory [5] : Theory [4] : Present CFD…”

Section: Methodssupporting

confidence: 92%

“…Figure 1 shows a comparison of the Strouhal numbers St between the simulated and the experimental results reported by Zhang and Edwards [17] and Takakura et al [18]. Broken and solid lines are drawn by using the formulae of predicting oscillation frequencies proposed by Heller and Bliss [4] and Nishioka et al [5], respectively.…”

Section: Methodsmentioning

confidence: 94%

“…In order to validate the computational code developed for the present numerical simulation, a two-dimensional open square cavity (length to depth ratio = 1.0) at a Mach number M inlet =1.83 at the cavity entrance was investigated without control and the solutions were compared with the existing results of the previous researchers [17,18]. Figure 1 shows a comparison of the Strouhal numbers St between the simulated and the experimental results reported by Zhang and Edwards [17] and Takakura et al [18].…”

Section: Methodsmentioning

confidence: 99%

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A computational investigation on the control of cavity-induced pressure oscillations using sub-cavity

et al. 2006

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A computational investigation has been conducted to determine the effectiveness of a passive control technique of attenuating cavity-induced pressure oscillations in a confined two-dimensional supersonic flow. The passive control technique is achieved by fitting two flat plates near the front wall of a square cavity at Mach number 1.83 at the cavity entrance. The results showed that the flat plates attached near the front wall of the cavity, discouraged the formation of feedback loop which is widely believed to be the reason of cavity resonance. The resultant amount of attenuation of pressure oscillations was also dependent on the length of the flat plate used as an oscillation suppressor.

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“…As seen from this figure, the simulated results are much closer to those obtained by Nishioka et al [5]. : Experimental [17] [18] : Theory [5] : Theory [4] : Present CFD…”

Section: Methodssupporting

confidence: 92%

Section: Methodsmentioning

confidence: 94%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

A computational investigation on the control of cavity-induced pressure oscillations using sub-cavity

et al. 2006

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“…A similar sequence of activities and the formation of typical feedback loop in the cavity were observed in the present numerical simulation that was in a good agreement with those reported by Rossiter (1964), Heller and Bliss (1975) and Nishioka et al (2002). o : Experiment (Zhang:md Edwards, 1989;Takakura etal, 1999) Theory (Nishioka et al, 2002) Theory (Heller and Bliss, 1975) (Heller and Bliss, 1975;Zhang and Edwards, 1989;Takakura et a!., 1999;Nishioka et al, 2002). Figure 2 shows a comparison of the Strouhal numbers Sf between the simulated and the experimental results (Zhang and Edwards, 1989;Takakuraet aI., 1999 in Fig.…”

Section: Computational Domain and Boundary Conditionsmentioning

confidence: 99%

A new method of controlling cavity-induced pressure oscillations using sub-cavity

et al. 2007

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A new passive control technique of cavity-induced pressure oscillations has been investigated numerically for a supersonic two-dimensional flow over open rectangular cavities at Mach number 1.83 at the cavity entrance. A subcavity on the front wall of the cavity covered by a flat plate was evaluated for the effectiveness of controlling cavityinduced acoustic oscillations. The results showed that sub-cavity is very effective in reducing cavity-induced pressure oscillations. The results also showed that the resultant amount of attenuation of cavity-induced pressure oscillations was dependent on the length and thickness of the flat plate, and also on the depth of the sub-cavity used as an oscillation suppressor.

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“…Various models have been proposed to model the physical processes in a cavity, namely, the interaction between pressure fluctuations and the acoustic source [6,8,9]. The results of Zhang and Edwards [10] showed open cavities to be dominated either by longitudinal or transverse oscillations depending on the L=D ratio and the Mach number.…”

Section: Introductionmentioning

confidence: 99%

Effect of Liquid Injection on Acoustic Field Induced from Supersonic Flow Past Cavities

Anavaradham

Sujith

Shreenivasan

et al. 2008

Journal of Propulsion and Power

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This paper describes an experimental investigation of the effect of transverse liquid injection (distilled water) on the acoustic field generated by confined supersonic flow past a cavity. The effect of cavity depth in the absence/ presence of liquid injection on the acoustic field is studied. In the presence of liquid injection, the effects of injection pressure and injection location on the acoustic field are investigated. The dependence of suppression/amplification of the acoustic amplitudes (compared with the absence of injection) on the injection condition and cavity depths is ascertained. In general, liquid injection in the presence of cavity resulted in higher amplitudes. Even square cavities that did not exhibit oscillations in the absence of injection generated significant acoustic amplitudes in the presence of liquid injection at high injection pressures. Phase-locked schlieren imaging was performed to sequence the fluiddynamic events. Schlieren images indicate the interaction of the shock wave generated by the flow past the liquid jet and the oblique shock generated at the cavity-leading edge. The schlieren images show that the amplitude increase observed for higher injection pressures for a range of cavity depths is accompanied by an unsteady normal shock ahead of the cavity-leading edge (which does not span the entire width of the test model, but is located locally in front of the liquid jet).

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Numerical study on supersonic internal cavity flows - What causes the pressure fluctuations?

Cited by 5 publications

References 4 publications

A computational investigation on the control of cavity-induced pressure oscillations using sub-cavity

A computational investigation on the control of cavity-induced pressure oscillations using sub-cavity

A new method of controlling cavity-induced pressure oscillations using sub-cavity

Effect of Liquid Injection on Acoustic Field Induced from Supersonic Flow Past Cavities

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