Improved delayed detached-eddy simulations of sawtooth spoiler control before supersonic cavity

Luo, Kun; Zhe, Weng; Xiao, Zhixiang; Fu, Song

doi:10.1016/j.ijheatfluidflow.2017.01.012

Cited by 16 publications

(4 citation statements)

References 41 publications

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“…where ρ is the fluid density, u i is the mean flow speed, p is the mean pressure, μ is the viscosity coefficient of fluid molecules, and τ ij is the subgrid stress tensor. To solve equations (4) and (5), the basic SGS stress model [42,43] is defined as…”

Section: Numerical Methodmentioning

confidence: 99%

“…Passive control methods are to control cavity flow with geometric modifications and do not use external energy/ momentum sources to control the flow. e common passive control methods include spoilers [1][2][3][4][5], fences [6,7], stepped leading edge [8], vortex generators [9][10][11][12], leading edge serrations [13], passive resonant absorbers [14], passive venting system with a porous cavity floor [15], and geometric ramp trailing edges [16]. For instance, Vikramaditya and Kurian [16] experimentally studied the flow field over cavities with different slant angles of trailing walls.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Simulation Study on Aeroacoustic Characteristics within Deformable Cavities

Ning

Shunshan

Zhang

et al. 2019

Shock and Vibration

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Cavity flow phenomena are encountered in many kinds of aviation vehicles. The flow-induced noise can easily cause structure resonance and fatigue damages. Therefore, the study on the mechanism and effective control methods of cavity noise are very important to engineering applications. A new active control method was proposed based on the deformable cavity in order to mitigate the cavity noise. Large eddy simulation (LES) and computational aeroacoustics (CAA) are combined to simulate a typical open cavity noise. The results show the first mode sound-pressure level (SPL) of tonal noise decreases gradually while the first mode frequency sharply jumps within a small range of the slant angle of the trailing and bottom wall. In addition, with the increase in the slant angle, the decrease of the first mode SPL of tonal noise at Mach 0.6 is more significant than that at Mach 0.85, but the increase of the first mode frequency at Mach 0.85 is more dramatical than that at Mach 0.6. The proposed method can not only reduce the first mode SPL obviously but also increase the first mode frequency dramatically, which makes it different from the natural frequency of the cavity structure and sequentially helps the cavity avoid fatigue damages from resonance.

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Section: Numerical Methodmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Study on Aeroacoustic Characteristics within Deformable Cavities

Ning

Shunshan

Zhang

et al. 2019

Shock and Vibration

View full text Add to dashboard Cite

show abstract

“…Luo et al [22] conducted numerical simulations of the M219 cavity flow at Ma = 1.5 using different serrated leading-edge sawtooth spoilers. Alam et al [23] achieved pressure oscillation control within the cavity flow by utilizing a sub-cavity at the leading edge.…”

Section: Introductionmentioning

confidence: 99%

Noise Prediction and Plasma-Based Control of Cavity Flows at a High Mach Number

Cai,

Zhang,

et al. 2023

Aerospace

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Cavity flows are a prevalent phenomenon in aerospace engineering, known for their intricate structures and substantial pressure fluctuations arising from interactions among vortices. The primary objective of this research is to predict noise levels in high-speed cavity flows at Mach 4 for a rectangular cavity characterized by an aspect ratio of L/D = 7. Moreover, this study delves into the influence of the plasma actuator on noise control within the cavity flow regime. To comprehensively analyze acoustic characteristics and explore effective noise reduction strategies, a computational fluid dynamics technique with the combination of a delayed detached eddy simulation (DDES) and plasma phenomenological model is established. Remarkably, the calculated overall sound pressure level (OASPL) and plasma-induced velocity closely align with the experimental data, validating the reliability of the proposed approach. The results show that the dielectric barrier discharge (DBD) plasma actuator changes the movement range of a dominating vortex in the cavity to affect the OASPL at the point with the maximum noise level. The control of excitation voltage can reduce the cavity noise by 2.27 dB at most, while control of the excitation frequency can only reduce the cavity noise by 0.336 dB at most. Additionally, the increase in excitation frequency may result in high-frequency sound pressure, but the influence is weakened with the increase in the excitation frequency. The findings highlight the potential of the plasma actuator in reducing high-Mach-number cavity noise.

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“…Lawson and Barakos [4] gave a comprehensive review on the topic of simulation and control of cavity flows, in which over 60 experimental and computational studies before 2011 were summarized and various passive strategies were presented. In recent years, it has also been reported that flow-induced cavity resonance could be alleviated by adding sawtooth spoilers [5] or a span-wise rod [6] at the leading edge, attaching sound-absorbing materials at the cavity bottom [7], or even reshaping the cavity with slanted rear and front walls [8].…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on Reducing Flow-Induced Cavity Resonance with a Narrowband Active Noise Control System

Zhang

et al. 2022

Applied Sciences

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In this paper, active control of flow-induced cavity resonance noise is addressed. A hybrid numerical method is presented to predict the resonance frequency and, instead of traditional active flow control, a narrowband active noise control system is utilized to suppress the resonance. A duct system is built up at low Mach numbers and experiments are carried out to validate the proposed methods. The results have shown that the resonance frequency could be predicted with 1.5% errors and the flow-induced narrowband noise could be effectively suppressed at both the fundamental frequency and its first harmonic. More than 10 dB global attenuations could be achieved for the fundamental resonance frequency without noise enhancements at other frequencies. Further, it was also found that the optimal reference frequency of the narrowband active noise control system could be largely biased from the original resonance frequency, which indicates a nonlinear mechanism of the control system.

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Improved delayed detached-eddy simulations of sawtooth spoiler control before supersonic cavity

Cited by 16 publications

References 41 publications

Numerical Simulation Study on Aeroacoustic Characteristics within Deformable Cavities

Numerical Simulation Study on Aeroacoustic Characteristics within Deformable Cavities

Noise Prediction and Plasma-Based Control of Cavity Flows at a High Mach Number

Experimental Research on Reducing Flow-Induced Cavity Resonance with a Narrowband Active Noise Control System

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