Perspective: Fluid Dynamics and Performance of Automotive Torque Converters: An Assessment

Backström, Theodor W. von; Lakshminarayana, B.

doi:10.1115/1.2835494

Cited by 11 publications

(2 citation statements)

References 28 publications

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“…In addition, compared with the mechanical transmission, HTC possesses a high capacity with relatively compact size and low weight. As a result, HTC has been applied in automatic transmission in automobiles, 1–3 heavy construction machines (such as the wheel loader, 4,5 roadheader 6 and forklift truck 7 ) and transmission system in wind turbine 8–10 up to now.…”

Section: Introductionmentioning

confidence: 99%

Multi-objective optimization design for the blade angles of hydraulic torque converter with adjustable pump

Zheng

Liu

Deng

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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To improve the efficiency of a hydraulic torque converter with adjustable pump at low load and thus increase the operation scope of high efficiency, multi-objective optimization design is carried out for the blade angles by incorporating three-dimensional steady computational fluid dynamics numerical simulation, design of experiments, Kriging surrogate model and multi-objective genetic algorithm. The results show that the angle of blade trailing edge in first-stage stator is the main influencing factor of the efficiency of hydraulic torque converter with adjustable pump. All the peak efficiencies of hydraulic torque converter with adjustable pump at three openings of the pump are improved after optimization, and the increased extent increases with decreasing opening of the pump. The operation scope of high efficiency consequently increases from 2.46 to 2.67. Besides, the improvement for the efficiency of hydraulic torque converter with adjustable pump is achieved by increasing the efficiency of the pump. The increase of angle of blade trailing edge in first-stage stator and the decrease of angle of blade leading edge in second-stage turbine after optimization induce the positive angle of attack at the inlet of second-stage turbine, thus realizing the performance optimization of hydraulic torque converter with adjustable pump. This also explains the increased proportion of the torque of second-stage turbine at larger speed ratios after optimization and the fact that the angle of blade trailing edge in first-stage stator is the main influencing factor of the efficiency of hydraulic torque converter with adjustable pump. The established multi-objective optimization method provides a reference solution for the optimization design of blade angles and for the improvement of integrated efficiency of hydraulic torque converter.

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Section: Introductionmentioning

confidence: 99%

Multi-objective optimization design for the blade angles of hydraulic torque converter with adjustable pump

Zheng

Liu

Deng

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

show abstract

“…One was to investigate the internal flow experimentally. Von Backstrom and Lakshminarayana (1996), Gruver et al (1996) and Watanabe et al (1997) have studied the visualization of the internal flow field with a LDV (Laser Doppler Velocimeter). The other was to use CFD results.…”

Section: Introductionmentioning

confidence: 99%

Performance estimation model of a torque converter part I: Correlation between the internal flow field and energy loss coefficient

Kim

Lim

et al. 2008

Int.J Automot. Technol.

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The objective of this paper is to improve the performance estimation model of the internal flow field of a torque converter. Compared with performance experiment results, the converter based on the one-dimensional model does not satisfy the performance requirements demanded in practice. Therefore, we need to develop more predictable and reliable performance estimation models. In order to obtain shape information on three-dimensional blade geometry, a process of reverse engineering conducts a torque converter assembly, impeller, turbine and stator. In addition, a CFD simulation including mesh generation and post-processing was carried out to extract equivalent parameters from the internal flow field. The internal flow field can be explained by analyze the correlation between a performance estimation model and CFD analysis. The equivalent performance model adopts the variation of energy loss coefficients for a given operating condition according to the application of a changing energy loss coefficient by the least mean squares method. The estimated equivalent model improves the agreement in performance between experiments and the theoretical model. This model can reduce the error to within about 3 percent. Furthermore, this procedure for predicted performance achieves eminence in the estimation of the capacity factor.

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Experimental measurement of the flow-induced pulsation in a hydrodynamic turbomachinery stator and its pressure fluctuation characteristics

Wei

Liu

et al. 2022

Engineering Science and Technology, an International Journal

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Perspective: Fluid Dynamics and Performance of Automotive Torque Converters: An Assessment

Cited by 11 publications

References 28 publications

Multi-objective optimization design for the blade angles of hydraulic torque converter with adjustable pump

Multi-objective optimization design for the blade angles of hydraulic torque converter with adjustable pump

Performance estimation model of a torque converter part I: Correlation between the internal flow field and energy loss coefficient

Experimental measurement of the flow-induced pulsation in a hydrodynamic turbomachinery stator and its pressure fluctuation characteristics

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