Pressure Measurements Inside Multiple Cavities of a Torque Converter and CFD Correlation

Rivera, Edward De Jesus

doi:10.37099/mtu.dc.etdr/719

Cited by 3 publications

(3 citation statements)

References 20 publications

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“…In the study of cavitation, EDJ Rivera discovered through CFD simulation and tests that flow recirculation occurred in the turbine and stator blade passages at low speed ratios. This is a key factor that leads to the occurrence of cavitation [5]. Jaewon Ju and his team calculated cavitation at various operating conditions using a commercial flow solver with the homogeneous cavitation model and compared the torque converter performance with experimental data.…”

Section: Introductionmentioning

confidence: 99%

Identification and Optimization Study of Cavitation in High Power Torque Converter

Wang,

Xu,

Zhao

et al. 2024

Applied Sciences

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Aiming at the phenomenon that a high-power torque converter is susceptible to cavitation, which leads to performance degradation, first, a transient flow field model of the torque converter is established, and CFD simulation and experimental research on the torque converter are carried out to find out the speed ratio region where cavitation occurs in the torque converter as well as the rule of occurrence of cavitation, and then the cavitation identification method based on the difference between the inlet and outlet flow of the torque converter is proposed. Then, the transient flow process inside the torque converter is analyzed, and it is pointed out that the angle between the inlet angle of the stator and the outlet angle of the turbine of the torque converter, i.e., the fluid inflow injection deviation angle is an important factor affecting the cavitation phenomenon. By adjusting the key parameters of the stator blade bone line, the fluid inflow deviation angle of the torque converter stator is optimized, so that the speed ratio range of cavitation under large load conditions is greatly reduced from the original 0–0.5 (50%) to 0–0.15 (15%). Meanwhile, in terms of test performance, the nominal torque of the torque converter is greatly improved under the premise of ensuring that the performance is basically unchanged, in which the nominal torque of the test zero speed is increased by 28.7%, and the cavitation of the torque converter has been greatly improved.

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Section: Introductionmentioning

confidence: 99%

Identification and Optimization Study of Cavitation in High Power Torque Converter

Wang,

Xu,

Zhao

et al. 2024

Applied Sciences

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“…Kunisaki et al [20] measured the flow field structure in a hydraulic torque converter using Particle Image Velocimetry (PIV). Hempy [21] and De Jesus Rivera [22,23] studied the internal fluid behavior of a hydraulic torque converter using 29 pressure sensors.…”

Section: Introductionmentioning

confidence: 99%

Research on the Influence of Charging Oil Conditions on the Axial Force of Hydraulic Torque Converter

et al. 2023

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The hydraulic torque converter is a critical component in high-power tracked vehicles such as bulldozers or bridge machines. Its axial force has a significant impact on the reliability and load-carrying capacity of the transmission system, which is greatly influenced by the charging oil conditions. To investigate the axial force characteristic of the torque converter and its charging oil effects, a computational fluid dynamics (CFD) method is established by considering inner and outer leakage regions, as well as inlet and outlet channels. Additionally, a novel axial force-testing method is proposed, and the axial force testing and validation experiments on the torque converter prototype have been completed. The research findings reveal that changes in oil viscosity resulting from variations in charging oil temperature have a considerable impact on the axial force of the torque converter. The axial force of the pump and turbine decreases as the temperature increases due to varying pressure sensitivity among different components. The influence of charging oil pressure on axial force follows a linear relationship, with its magnitude determined by the axial unbalanced area of the hydraulic torque converter during its design and development. In addition, a formula for the axial force of the hydraulic torque converter is proposed under different charging oil pressures. Furthermore, a novel suppression of axial force has been proposed without altering the structure, which has been validated as an effective method. The results lay a theoretical foundation for the research and suppression of axial forces in hydraulic torque converters, and they also have an engineering application value in the design of high-reliability and long-life converters.

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“…Они основаны на использовании одномерных моделей с применением эмпирических данных для аппроксимации потерь внутри ГДТ. Недостатком любой одномерной модели является отсутствие воспроизводимости уровней точности [4].…”

unclassified

Investigation of the Cavitation Process in the Circulation Circle of the Hydromechanical Transmission of the Belaz Loader

PARMANCHUK,

SHYSHKO,

REHINIA

2023

MMMM

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A study of the working fluid flow in the torque converter was carried out using CFD modeling technology and an analysis of the dependence of cavitation on the torque converter operating mode. It is noted that torque converter cavitation mainly occurs at low gear ratios, the degree of cavitation decreases as the gear ratio increases. Most of the cavitation bubbles formed at the ends of the reactor wheel blades, which led to an unstable change in the moment characteristics and a deterioration in the torque converter performance. The analysis showed that the cavitation process is extremely unstable and periodic, and the development of cavitation near the top of the impeller blade occurs in four stages: the creation, growth, separation and decay of cavitation bubbles.

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Pressure Measurements Inside Multiple Cavities of a Torque Converter and CFD Correlation

Cited by 3 publications

References 20 publications

Identification and Optimization Study of Cavitation in High Power Torque Converter

Identification and Optimization Study of Cavitation in High Power Torque Converter

Research on the Influence of Charging Oil Conditions on the Axial Force of Hydraulic Torque Converter

Investigation of the Cavitation Process in the Circulation Circle of the Hydromechanical Transmission of the Belaz Loader

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