Mathematical Model for Elliptic Torus of Automotive Torque Converter and Fundamental Analysis of Its Effect on Performance

Liu, Chunbao; Changsuo, Liu; Ma, Wenxing

doi:10.1155/2015/851816

Cited by 3 publications

(1 citation statement)

References 25 publications

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“…CC represents the capacity of the power transmission, 10 −6 min 2 r −2 m −1 . The details of the hydrodynamic performance calculation and experimental apparatus of the hydrodynamic torque converter were reported previously [26]. CFD models with and without cavitation were used.…”

Section: Validation Of the Cfd Modelmentioning

confidence: 99%

3D Cavitation Shedding Dynamics: Cavitation Flow-Fluid Vortex Formation Interaction in a Hydrodynamic Torque Converter

Ran

Liu

2021

Applied Sciences

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Recent experiments have shown interactions between the cavitation and fluid vortex formation in a hydrodynamic torque converter. This study aimed to clarify the unsteady cavitation trigger mechanism and flow-induced vibration caused by turbulence–cavitation interactions. The mass transfer cavitation model and modified Reynolds-averaged Navier–Stokes k–ω model were used with a local density correction for turbulent eddy viscosity to investigate the cavitation structure in a hydrodynamic torque converter under various operating conditions. The model results were then validated against test data. The multi-block structured gridding technique was used to develop an orthogonally structured grid of a three-dimensional full-flow passage as an alternative analysis method for the cavitation flow. The results indicated that the re-entrant jet is the main cause of the shedding cavitation and breaking O-type cavitation. The re-entrant jet is driven by the reverse pressure gradient to move upstream towards the stator nose, and it lifts and splits the attached cavitation, which periodically induces shedding cavitation. When the cavitation was considered, the prediction error of the capacity constant was reduced from 13.23% to <5%. This work provides an insight into the cavitation–vortex interactions in a hydrodynamic torque converter, which can be used to improve the prediction accuracy of the hydrodynamic performance.

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Section: Validation Of the Cfd Modelmentioning

confidence: 99%

3D Cavitation Shedding Dynamics: Cavitation Flow-Fluid Vortex Formation Interaction in a Hydrodynamic Torque Converter

Ran

Liu

2021

Applied Sciences

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Design Approach and Mechanism Analysis for Cavitation-Tolerant Torque Converter Blades

Ran

Liu

2022

Applied Sciences

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As the development of hydrodynamic torque converters (HTCs) points toward increasing the pump input power and pump rotation speed, the negative effects of cavitation are worsening. Most studies focus on suppressing fluid machinery cavitation to attenuate the negative effects of cavitation, such as noise, vibration, and blade damage. Therefore, we proposed two stator cavitation suppression slotting methods to suppress stator cavitation in HTCs: (1) slotting both sides of the pressure and suction sides and (2) slotting one side of the suction side. The key design parameters are analyzed, including the slot width and slot position of the stator blade. Findings show that a wider slot enlarges the mass flow rate ventilation through the slot, thus reducing the cavitation risk but decreasing the hydrodynamic performance. The most effective slot position for the second proposed method (slotting one side of the suction side) is between S0.15 (stator suction side dimensionless distance 0.15 location) and S0.6 (stator blade suction side); here, the stator cavitation can be suppressed completely. The capacity factor (Tbg) and torque ratio (K) are decreased by 6.81% and 3.23%, respectively, under the stalling speed ratio, whereas the stator cavitation almost completely disappears. Therefore, the new method of slotting one side of the stator suction side completely suppresses the stator cavitation and significantly shortens the cavitation duration. The new method of slotting one side of the blade suction side can serve as a reference for turbomachinery design.

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Development of a rational model range of hydrodynamic torque transformers based on their key parameters: existing approaches overview

Белабенко¹

2023

Trudy NAMI

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Introduction (problem statement and relevance). Today's scientific papers on hydrodynamic torque transformers are related to the topic of optimising their design in order to decrease the cost of manufacture with improvement or insignificant degradation of transforming properties and fuel economy at the same time. However, no attention is paid to the issue of building rational model ranges of hydrodynamic torque transformers.The purpose of the study is to analyze the existing approaches to development of model ranges of hydrodynamic torque transformers and to search for criteria for development of a higher-quality calculation method.Methodology and research methods. The study was carried out by comparing the model ranges of hydrodynamic torque transformers in question produced by various manufacturers and defining the common parameters applied to classify models in a model range.Scientific novelty and results. As a result of the analysis of model ranges of hydrodynamic torque transformers and existing methods of development of model ranges of hydrodynamic torque transformers, classification of approaches to their development has been carried out. Recommendations were also given regarding the parameters to be considered when developing model ranges of hydrodynamic torque transformers.The practical significance consists in the systematization of information about the model ranges of hydrodynamic torque transformers of different manufacturers. It is shown that building model ranges of hydrodynamic torque transformers according to the known methods does not take into account correspondence of their key parameters with the characteristics of the range of internal combustion engines applied together therewith. The paper offers the approach, which takes this aspect into account.

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Mathematical Model for Elliptic Torus of Automotive Torque Converter and Fundamental Analysis of Its Effect on Performance

Cited by 3 publications

References 25 publications

3D Cavitation Shedding Dynamics: Cavitation Flow-Fluid Vortex Formation Interaction in a Hydrodynamic Torque Converter

3D Cavitation Shedding Dynamics: Cavitation Flow-Fluid Vortex Formation Interaction in a Hydrodynamic Torque Converter

Design Approach and Mechanism Analysis for Cavitation-Tolerant Torque Converter Blades

Development of a rational model range of hydrodynamic torque transformers based on their key parameters: existing approaches overview

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