Computational Study on Hysteretic Inlet Buzz Characteristics Under Varying Mass Flow Conditions

Hong, Wooram; Kim, Chongam

doi:10.2514/1.j052481

Cited by 36 publications

(14 citation statements)

References 19 publications

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“…Therefore, the oscillatory flow ought to link with the standing wave formed inside the inlet. This conclusion is also in agreement with previous speculations [2,17,19]. Inspired by the standing wave expression, the fluctuation component of the pressure inside the inlet should take a formulation as:…”

Section: Theoretical Analysissupporting

confidence: 90%

“…On the numerical side, it is difficult to achieve the high-precision numerical simulation for the high-frequency oscillatory flow of the big buzz [15,18]. Until 2014, Hong et al [19] conducted the numerical simulation of the buzz evolution. However, advanced analysis methods for revealing the characteristics of the inlet buzz have not been established so far and no affirmation was made mathematically upon the flow characteristics.…”

Section: Introductionmentioning

confidence: 99%

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Spatiotemporal Characterization and Suppression Mechanism of Supersonic Inlet Buzz with Proper Orthogonal Decomposition Method

Luo

Wei

et al. 2020

Energies

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The buzz phenomenon of a typical supersonic inlet is analyzed using the unsteady Reynolds Average Navier-Stokes (RANS) simulation and proper orthogonal decomposition (POD) method. The dominant flow patterns and characteristics of the buzzed flow are obtained by decoupling the computed pressure field into spatial and temporal sub-parts based on the POD method. The supersonic inlet buzz phenomenon could be approximated as a product of decoupled temporal and spatial terms, and the one-dimensional (1D) mathematical model is therefore proposed. The standard deviations of the unsteady pressure fields from both the numerical simulation and the model prediction are compared. The limited discrepancy can be observed, and the good agreement validates the credibility of the proposed 1D model. The numerical simulation and the 1D model prediction are presented to explore the unsteady-jet control with a small perturbation. The results of the 1D model and the numerical simulation achieve good agreements with each other in terms of the overall trend. Finally, POD modal energy is employed to analyze the buzz suppression mechanism. When the jet frequency is identical to the dominant frequency of the buzz and the jet phase is opposite to the oscillation phase of the captured mass flow, the buzz suppression could be more efficient. The buzz suppression mechanism could be explained in two aspects. For one thing, the complex flow structure is suppressed and the first average modal energy in the inlet is increased. For another, the energy redistribution among each POD mode is achieved and the flow stability is gradually enhanced.

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Section: Theoretical Analysissupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Spatiotemporal Characterization and Suppression Mechanism of Supersonic Inlet Buzz with Proper Orthogonal Decomposition Method

Luo

Wei

et al. 2020

Energies

View full text Add to dashboard Cite

show abstract

“…The zone type of Fluid 3 is a rigid body and the four boundaries surrounding this domain are interface 2, axis GH, inner wall LM, and plug wall GN, whose types are stationary, deforming, deforming, and rigid body, respectively. The boundary of the plug wall moves forward with a speed of 32.5 mm/s [20]. In a decreasing throttling ratio process, the first layer cells on the plug wall merge with the next layer when the cell height is below to a threshold controlled by the collapse factor (0.5) and a reference of cell height (0.0001 mm).…”

Section: Computational Dynamic Mesh and Boundary Conditionsmentioning

confidence: 99%

“…Besides, sides AI and GH are both "axis" and the "wall" boundary condition is applied at the rest of the sides. plug wall moves forward with a speed of 32.5 mm/s [20]. In a decreasing throttling ratio process, the first layer cells on the plug wall merge with the next layer when the cell height is below to a threshold controlled by the collapse factor (0.5) and a reference of cell height (0.0001 mm).…”

Section: Computational Dynamic Mesh and Boundary Conditionsmentioning

confidence: 99%

“…Considering the discrepancy between real inlet duct and the ideal acoustic duct, through numerical simulations using the Dailey's inlet geometry [6], Lu and Jain [17] revised the upstream feedback mechanism which attributed the buzz cycle to the coupling of the acoustic resonance occurred inside the plenum chamber and the instability around the inlet entrance. Chima [19] and Hong [20] substantiate the relation between inlet buzz and duct acoustic resonance. Recent progress by Tan et al [14] revealed two acoustic feedback loops are simultaneously established during buzz.…”

Section: Introductionmentioning

confidence: 99%

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Acoustic Modeling and Vibration Characteristics of Supersonic Inlet Buzz

et al. 2020

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The buzz phenomenon of a typical supersonic inlet is analyzed on the basis of numerical simulations and duct acoustic theory. Considering that the choked inlet could be treated as a duct with one end closed, a one-dimensional (1D) mathematical model based on the duct acoustic theory is proposed to describe the periodic pressure oscillation of the little buzz and the big buzz. The results of the acoustic model agree well with that of the numerical simulations and the experimental data. It could verify that the dominated oscillation patterns of the little buzz and the big buzz are closely related to the first and second resonant mode of the standing wave, respectively. The discrepancies between the numerical simulation and the ideal acoustic model might be attributed to the viscous damping in the fluid oscillation system. In order to explore the damping, a small perturbation jet is introduced to trigger the resonance of the buzz system and the nonlinear amplification effect of resonance might be helpful to estimate the damping. Through the comparison between the linear acoustic model and the nonlinear simulation, the calculated pressure oscillation damping of the little buzz and the big buzz are 0.33 and 0.16, which could be regarded as an estimation of real damping.

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Shock wave bifurcation in convergent–divergent channels of rectangular cross section

Kuzmin

2016

Shock Waves

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Computational Study on Hysteretic Inlet Buzz Characteristics Under Varying Mass Flow Conditions

Cited by 36 publications

References 19 publications

Spatiotemporal Characterization and Suppression Mechanism of Supersonic Inlet Buzz with Proper Orthogonal Decomposition Method

Spatiotemporal Characterization and Suppression Mechanism of Supersonic Inlet Buzz with Proper Orthogonal Decomposition Method

Acoustic Modeling and Vibration Characteristics of Supersonic Inlet Buzz

Shock wave bifurcation in convergent–divergent channels of rectangular cross section

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