Development of the Integrated Process for Torque Converter Design and Analysis

Song, Kyoung Doo; Kim, Kyusup; Park, JaeIn; Kook, JaeChang; Oh, JongSun; Cho, JangHyung; Kim, MunSung

doi:10.4271/2008-01-0785

Cited by 9 publications

(8 citation statements)

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“…It is concluded that LES can improve numerical accuracy and clearly capture the transient flow phenomenon in detail, compared with Reynolds averaged Navier-Stokes (RANS). 16,17 It is found that the kinetic energy transport (KET) model in LES has more advantages in predicting the accuracy of external characteristics. Comparing the experimental data of the rig test, this paper verifies the KET model's prediction accuracy.…”

Section: Selection Of Cfd Modelmentioning

confidence: 99%

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Performance improvement and flow field investigation in hydraulic torque converter based on a new design of segmented blades

Liu

Yang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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Hydraulic torque converter is of lower efficiency in the powertrain, particularly at low speed ratio, which is crucial for vehicles due to its ability of torque multiplication. Therefore, torque converters should be taken into account with both higher start-up acceleration and transmission efficiency. Inspired by the fact that the multi-airfoils of the aircraft can improve the lift, a new design of segmented turbine blade in torque converter is presented to improve the transmission efficiency and start-up acceleration. To ensure reproducibility and popularization, the camber line and shape of blades are extracted to obtain the expression in the Cartesian coordinate system. A scale-resolving simulation setting, large eddy simulation with kinetic energy transport, and refined hexahedron meshes, which were verified by our studies, are applied to simulate the three-dimensional transient flow numerically. According to the results of computational fluid dynamics analysis, the new design eliminated the ultra-high vorticity of the near-wall boundary layer to reduce the flow loss, which further improves fuel economy. The pressure difference in the segmented turbine blade is significantly higher than that of the original model, causing the improvement of powertrain performance. As a result, the torque ratio and nominal torque increase by 6.7% and 7.7%, respectively, at stalling speed ratio; meanwhile, the maximum efficiency increases by 1.1%. This research, using a new design of segmented blades, has many advantages, such as high starting torque ratio, large adjusting range, and greater fuel economy, and shows great potential to apply in the manufacturing process.

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Section: Selection Of Cfd Modelmentioning

confidence: 99%

“…A large number of studies show that the high-precision CFD numerical simulation method is feasible and effective in the design of TC. [15][16][17][18] In our research, the whole flow passage structured mesh is used to simulate the unsteady flow of TC. What's more, the idea of instantaneous simulation of TC is established.…”

Section: Introductionmentioning

confidence: 99%

Performance improvement and flow field investigation in hydraulic torque converter based on a new design of segmented blades

Liu

Yang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…Shin et al [8,9] investigated the effect of reactor blade geometry with varying thickness ratios, scroll angles and slot angles on the performance of a torque converter. Song et al [10] presented an integrated design process TDOS (Torque converter Design Optimization System) including torque converter geometry designer, 3D CFD analysis module, and design optimizer. The system was used to investigate the effect of design parameters on the performance.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis and Improvement of Flat Torque Converters Using DOE Method

Chen

Zhu

2018

Chin. J. Mech. Eng.

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Automotive torque converters have recently been designed with an increasingly narrower profile for the purpose of achieving a smaller axial size and reducing weight. Design of experiment (DOE) and computational fluid dynamics (CFD) techniques are applied to improve the performance of a flat torque converter. Four torque converters with different flatness ratios (0.204, 0.186, 0.172, and 0.158) are designed and simulated first to investigate the effects of flatness ratio on their overall performance, including efficiency, torque ratio, and impeller torque factor. The simulation results show that the overall performance tends to deteriorate as the flatness ratio decreases. Then a parametric study covering six geometric parameters, namely, inlet and outlet angles of impeller, turbine, and stator is carried out. The results demonstrate that the inlet and outlet angles play an important role in determining the performance characteristics of a torque converter. Furthermore, the relative importance of the six design parameters is investigated using DOE method for each response (stall torque ratio and peak efficiency). The turbine outlet angle is found to exert the greatest influence on both responses. After DOE analysis, an optimized design for the flat torque converter geometry is obtained. Compared to the conventional product, the width of the optimized flat torque converter torus is reduced by about 20% while the values of stall torque ratio and peak efficiency are only decreased by 0.4% and 1.7%, respectively. The proposed new optimization strategy based on DOE method together with desirability function approach can be used for performance enhancement in the design process of flat torque converters.

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“…Thus, much research has been done on the coupling of CFD and DOE in the design of turbomachines, 2,3 blades, 4 engine, 5,6 and other automobile applications. 7 Song et al 8 developed a torque converter design optimization system, which integrated blade geometry design, CFD simulation, and optimization to simplify the design process for torque converters. Liu et al 9 performed a DOE study in combination with CFD to optimize the blade count in terms of torque converter hydrodynamic performance.…”

Section: Introductionmentioning

confidence: 99%

Design of experiments to investigate blade geometric effects on the hydrodynamic performance of torque converters

Liu

Wei

Yan

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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Torque converters are key components in automatic and hydrodynamic transmissions. Power is transmitted through the reaction force of fluid on cascades; thus, the geometry of the blade is essential to torque converter performance. The traditional one-dimensional blade design approach becomes inefficient for modern torque converter design because torque converters are highly coupled turbomachines and the flow is three-dimensional. In the present research, a novel six-parameter blade camberline design was developed to describe the overall shape of the blade. A full two-level factorial design was conducted with computational fluid dynamics (CFD) simulations on each component to determine the sensitivity of design variables and investigate the relationship between design parameters and hydrodynamic performance. The design variables were reduced from 18 to nine after the screening design. A quarter-fractional factorial design was performed on the selected primary design variables to explore the first-order interaction effects between different wheels. Then a response surface was generated for each component to provide a substitution model for further optimization. A series of torque converters with various design parameters were fabricated and tested to validate the important effects determined in the design of experiments (DOE) process. It is found that CFD in combination with DOE is able to precisely capture the correlation between design variables and hydrodynamic performance. A base torque converter was optimized based on the DOE studies and the result was tested. Pronounced improvement in powertrain performance and fuel economy were observed.

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Development of the Integrated Process for Torque Converter Design and Analysis

Cited by 9 publications

References 0 publications

Performance improvement and flow field investigation in hydraulic torque converter based on a new design of segmented blades

Performance improvement and flow field investigation in hydraulic torque converter based on a new design of segmented blades

Performance Analysis and Improvement of Flat Torque Converters Using DOE Method

Design of experiments to investigate blade geometric effects on the hydrodynamic performance of torque converters

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