1619 Dynamic stereo PIV measurements and 3-D reconstruction of the flow field inside a torque converter model

Kawashima, Kazunori; Okada, Kotaro; Nishino, Koichi

doi:10.1299/jsmefed.2015._1619-1_

Cited by 2 publications

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“…(6) Another case study reported that the phase-averaged velocity maps according to the relative angles of the dynamic to the static cascades were reconstructed to visualize characteristics of this unsteady flow field. (7) There has also been a report on the effect of the stator on the frequency characteristics by applying a wavelet transform to the flow field around the stator. (8) As described above, the internal flow field in the torque converter has been clarified by numerical and experimental analyses, and a lot of information has been obtained.…”

Section: Introductionmentioning

confidence: 99%

Internal Flow Structure of Torque Converter Analyzed with Dynamic Mode Decomposition under Steady Driving Condition

Kunisaki

Murata

Tanaka

2020

IJAE

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The structure of the flow field inside a torque converter was quantitatively evaluated using dynamic mode decomposition (DMD). The input time series data in the interference region of the cascade blades were measured using particle image velocimetry (PIV). The spatiotemporal flow field was decomposed by DMD into several modes. Each DMD mode corresponds to the frequency of the flow field fluctuation. The flow field frequency mainly consisted of blade passing frequencies and their harmonics. The flow field was visualized for each DMD mode. Positive and negative vortex structures were generated alternately in the direction of rotation of the impeller and turbine. It was found that the vortex structure became smaller at a lower speed ratio.

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Section: Introductionmentioning

confidence: 99%

Internal Flow Structure of Torque Converter Analyzed with Dynamic Mode Decomposition under Steady Driving Condition

Kunisaki

Murata

Tanaka

2020

IJAE

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Analysis of the Internal Flow Structure of Torque Converter Using Proper Orthogonal Decomposition under Transient Driving Conditions

Kunisaki

Murata

Tanaka

2020

IJAE

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The characteristic structure of the flow field in a torque converter is quantitatively evaluated using proper orthogonal decomposition (POD) under transient driving conditions assuming start-up acceleration and deceleration of a vehicle. The time-series velocity data inside the torque converter to be input to POD is measured using a particle image velocimetry (PIV) technique. At first, in the case of changing the rotational speed of the impeller or turbine, dynamic cascades with changing rotational speed were observed to induce fluid motion. The flow field structure was gradually reformed according to the speed ratio after transition. In addition, the region of structural changes of the flow field was found to be larger for the decelerating driving condition compared to the case of start-up acceleration.

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1619 Dynamic stereo PIV measurements and 3-D reconstruction of the flow field inside a torque converter model

Cited by 2 publications

References 0 publications

Internal Flow Structure of Torque Converter Analyzed with Dynamic Mode Decomposition under Steady Driving Condition

Internal Flow Structure of Torque Converter Analyzed with Dynamic Mode Decomposition under Steady Driving Condition

Analysis of the Internal Flow Structure of Torque Converter Using Proper Orthogonal Decomposition under Transient Driving Conditions

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