Influence of Acoustic Perturbation and Acoustically Induced Thermal Convection on Premixed Flame Propagation

Yano, Takuma; Takahashi, Kenichi; Kuwahara, Taishi; Tanabe, Mitsuaki

doi:10.1007/s12217-009-9169-x

Cited by 6 publications

(5 citation statements)

References 5 publications

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“…These experiments are made also with the MGLAB drop shaft. The detail of the experimental setup is explained in the previous work (Yano et al 2010). Only the difference with the work is the optical observation method.…”

Section: Experiments On Combustion Induced Secondary Flowmentioning

confidence: 99%

“…In CFD field, the word "DNS" is commonly used for a direct simulation in space (and not necessarily in time space). The computational cost of the previously reported FDTD (Yano et al 2010) is very high, because a very fine time stepping is required to catch the motion of acoustic wave propagation that is at sound speed. As is true to RANS type model calculation for turbulent flow, time averaging is one of the most convenient approaches to reduce the CPU cost.…”

Section: Numerical Interpretation Of the Driving Forcementioning

confidence: 99%

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Drop Tower Experiments and Numerical Modeling on the Combustion-Induced Secondary Flow in Standing Acoustic Fields

Tanabe

2010

Microgravity Sci. Technol.

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From the microgravity experiments on single fuel droplet combustion and on spark-ignited premixed flame in acoustic field, that have been done in this decade, secondary flow has been confirmed. The flow occurs only when combustion occurs and always in the direction to the neighboring node of velocity oscillation in standing acoustic field. This flow is thought to be driven by a kind of acoustic radiation force that arises from density non-uniformity due to combustion. According to the hypothesis, the driving force is expected to be very similar to buoyancy, being a volumetric force proportional to density difference. Since the mechanism tells that only the density difference due to combustion is the requirements for the occurrence of the secondary flow, a simpler system is employed for the hypothesis validation. A hot wire in a standing acoustic field gives a local temperature rise and the secondary flow is successfully reproduced. To avoid buoyancy that covers the radiation force, microgravity conditions are used. Through direct-and modeled numerical simulations and with drop tower experiments, the validity of the hypothesis is checked out. As a result, the supposed radiation force is found to be able to explain well the characteristics of the secondary flow. It is found that adding an acoustic radiation force term determined from acoustic parameters into conventional CFD calculation, one can sufficiently reproduce and predicts the behavior of the secondary flow numerically.

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Section: Experiments On Combustion Induced Secondary Flowmentioning

confidence: 99%

Section: Numerical Interpretation Of the Driving Forcementioning

confidence: 99%

Drop Tower Experiments and Numerical Modeling on the Combustion-Induced Secondary Flow in Standing Acoustic Fields

Tanabe

2010

Microgravity Sci. Technol.

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“…2005; Yano et al. 2010). Indeed, simple demonstrations shown in figure 1 capture some aspects of these phenomena: dry ice vapour is attracted to, and fire is repelled from, acoustic beams.…”

Section: Introductionmentioning

confidence: 99%

Convective instability in a stratified ideal gas containing an acoustic field

Koulakis

Putterman

2021

J. Fluid Mech.

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“…It was clarified that this streaming was driven by acoustic radiation force. At the velocity anti-node, the secondary streaming toward to the normal direction of sound propagation direction was found 4) . In high sound pressure condition, flame was wrinkled.…”

Section: Introductionmentioning

confidence: 98%

Flame Stabilization Method Using Thermo-Acoustic Oscillation

Saito

Minei

Ishii

et al. 2014

AEROSPACE TECHNOLOGY JAPAN

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The flame stabilization method using thermo-acoustic oscillation was demonstrated and the effectiveness of the sound for the flame stabilization was validated by investigation of the lift-off height change in a standing acoustic field which is a simple acoustic system. The insight of stabilization mechanism, focused on the variation of temperature, flow fields and reaction rate, was validated by CFD tool. To form the stabilized lifted diffusion flame and deal with as two dimensionally, 2D flame which formed in the mixing layer of the air and the fuel was employed for the analyzed flame. Thermo-acoustic oscillation was generated by forming flames in two stainless resonance tubes which are placed face to face. This oscillation was applied to the flame which is held by a cylindrical flame holder at the center of stainless resonance tube's open ends. Standing acoustic field was generated by two loud speakers which are driven at the resonance frequency in a stainless resonance tube. As a result, the flame was stabilized by thermo-acoustic oscillation without the flame holder. It was found that the flame lift-off height decreased with sound both from the experimental result and the CFD result. Flow speed normal to the sound propagation direction and temperature oscillated with sound.

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Influence of Acoustic Perturbation and Acoustically Induced Thermal Convection on Premixed Flame Propagation

Cited by 6 publications

References 5 publications

Drop Tower Experiments and Numerical Modeling on the Combustion-Induced Secondary Flow in Standing Acoustic Fields

Drop Tower Experiments and Numerical Modeling on the Combustion-Induced Secondary Flow in Standing Acoustic Fields

Convective instability in a stratified ideal gas containing an acoustic field

Flame Stabilization Method Using Thermo-Acoustic Oscillation

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