Measurement of fine scale structure in turbulence by time-resolved dual-plane stereoscopic PIV

Tanahashi, Mamoru; Hirayama, Tetsu; Taka, Shohei; Miyauchi, Toshio

doi:10.1016/j.ijheatfluidflow.2008.02.009

Cited by 33 publications

(17 citation statements)

References 26 publications

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“…Spatial cutoff filter which has been developed by our previous study (29) was used to eliminate highwave number noises introduced by the overlap of the interrogation windows. The accuracy of the PIV measurement with the elimination scheme of spurious vectors and noise has been ensured by a PIV simulation based on DNS of particle-laden homogeneous isotropic turbulence in the previous study (30) . From two-dimensional velocity fields obtained by each camera, three-component velocity vectors on a two-dimensional plane were calculated by using a geometrical relation (26), (31) .…”

Section: Calculation Of Velocitymentioning

confidence: 99%

Large-Scale Vortical Motion and Pressure Fluctuation in Noise-Controlled, Swirl-Stabilized Combustor

Shimura

Tanahashi

Choi

et al. 2009

JTST

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To clarify the mechanisms of combustion oscillation, combustion noise and their suppression by secondary fuel injection, simultaneous measurements of stereoscopic particle image velocimetry (SPIV) and pressure fluctuation in combustion chamber were conducted on several planes of a swirl-stabilized turbulent premixed flame for no control case and noise-controlled case by continuous secondary fuel injection. Velocities measured by SPIV were averaged in 8 phases of the pressure fluctuation and streamlines were obtained from the phase-averaged velocities. For no control case, large-scale vortical structures are generated in regions around the axial centerline of the combustor and outer edge of the swirl nozzle in the phase of low pressure. With increasing pressure, they move near the contour surface of mean progress variablec = 0.5 which have been obtained in the previous study. These large-scale vortical motions induce fluctuation of flame front and enhance entropy term in the acoustic sound source. The secondary fuel injection suppresses the velocity fluctuation in the inner recirculation zone, resulting in reduction of combustion noise. These results show that control of the large-scale vortical motion is important for reduction of combustion noise.

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Section: Calculation Of Velocitymentioning

confidence: 99%

Large-Scale Vortical Motion and Pressure Fluctuation in Noise-Controlled, Swirl-Stabilized Combustor

Shimura

Tanahashi

Choi

et al. 2009

JTST

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“…The size of the filamentary vortices increases slowly with wall-normal position (Carlier and Stanislas 2005, Pirozzoli et al 2008, Stanislas et al 2008. When scaled with the local Kolmogorov length-scale, η, the mean diameter is about 8-12η (Tanahashi et al 2004, Pirozzoli et al 2008, Stanislas et al 2008, Tanahashi et al 2008, Gao et al 2011, Marusic and Adrian 2013.…”

mentioning

confidence: 99%

Experimental study on the role of spanwise vorticity and vortex filaments in the outer region of open-channel flow

Chen

Adrian

Zhong

et al. 2014

Journal of Hydraulic Research

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“…The diameter and density of incense particle and DEHS particle were about 0.2 µm (15) , 1.06 g/cm 3 (15) and 1 µm (16) , 0.91 g/cm 3(17) , respectively. The Stokes number based on Kolmogorov time scale (18) were sufficiently less than unity (order of 10 -2 for large measurement field and order of 10 -4 for small measurement field). Thus, it was considered that these particles follow with fluid motion.…”

Section: Turbulence Characteristics 41 Experimental Setup For Piv Mementioning

confidence: 96%

“…(14) shown later, were less than 3 for all PIV measurement conditions examined for the small measurement field. Tanahashi et al (18) showed that the accuracy of gradient of velocity fluctuation can be improved by the low-pass filtering with the threshold wavenumber which corresponds to the minimum spatial resolution of PIV measurement. The low-pass filtering was adopted in this study.…”

Section: Longitudinal Taylor Microscale and Kolmogorov Length Scalementioning

confidence: 99%

Analysis of Turbulent Burning Velocity of Spherically Propagating Premixed Flame with Effective Turbulence Intensity

Hayakawa

Miki

Nagano

et al. 2012

JTST

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Burning velocity of spherically propagating turbulent flames kept increasing with flame propagation. On the other hand, turbulent burning velocity obtained from burner stabilized flame is constant for a given turbulence intensity. This difference of turbulent burning velocity characteristic was discussed by Abdel-Gayed and Bradley et al. For spherically propagating flames, not all turbulent eddies contribute to the turbulence that affect the turbulent flame. Small flames may be wrinkled only by small scale turbulent eddies. As the flame propagates, it becomes progressively wrinkled by the larger eddies. The turbulence which contributes to turbulent flame may increase with the increase in flame radius. This increase in turbulence may cause the increase in turbulent burning velocity. The effective turbulence intensity was proposed by Abdel-Gayed and Bradley et al. as the turbulence intensity which contributes effectively to turbulent flame. In this study, the turbulence characteristics which are necessary for obtaining the effective turbulence intensity were evaluated by Particle Image Velocimetry (PIV) measurement. Then turbulent burning velocity of iso-octane/air flame was investigated with effective turbulence intensity. The turbulent burning velocity increased with the increase in effective turbulence intensity. The increase in turbulent burning velocity may be caused by the increase in flame front area with increase in the effective turbulence intensity.

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Measurement of fine scale structure in turbulence by time-resolved dual-plane stereoscopic PIV

Cited by 33 publications

References 26 publications

Large-Scale Vortical Motion and Pressure Fluctuation in Noise-Controlled, Swirl-Stabilized Combustor

Large-Scale Vortical Motion and Pressure Fluctuation in Noise-Controlled, Swirl-Stabilized Combustor

Experimental study on the role of spanwise vorticity and vortex filaments in the outer region of open-channel flow

Analysis of Turbulent Burning Velocity of Spherically Propagating Premixed Flame with Effective Turbulence Intensity

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