Analysis of the Influence of the Number of Torque Converter Blades on Working Performance Based on the Response Surface Method

Xiong, Ping; Sun, Hongjun; Jiping, Zhong; Zhen, Chenping; Chen, Xinyuan; Gao, Huichao

doi:10.1088/1742-6596/1748/2/022028

Cited by 4 publications

(3 citation statements)

References 4 publications

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“…Under the same conditions as the experiment, the torque of the pump, turbine, and stator can be obtained by simulation. Besides, these performance metrics were always used to evaluate the basic cavitation performance of the torque converter [1,24], including torque ratio, efficiency, and capacity constant, which are defined as, 5 2…”

Section: Validation Of Cfd Modelmentioning

confidence: 99%

The Effect of Rotating Speeds on the Cavitation Characteristics in Hydraulic Torque Converter

et al. 2022

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Hydraulic torque converter is a kind of high speed rotating machine using viscosity hydraulic oil as working medium, and its internal flow field is very complex. Thereby cavitation can occur easily in the working process, resulting in severe degradation of torque converter performance, noise, vibration and even failure. In order to reveal the effect of rotating speeds on the cavitation characteristics, a full flow passage geometry and a computational fluid dynamics (CFD) model with cavitation were developed to analyze the flow behavior in the torque converter. The results show that cavitation occurs when the speed difference between pump and turbine exceeds 1400 rpm for the basic model torque converter, which could be used as a useful indicator for the occurrence and degree of severity of flow cavitation. The increase of pump rotating speed or the decrease of speed ratio will intensify cavitation, which reduces the hydraulic transmission capacity and efficiency by over 20%, and seriously alters the shape, size, vapor volume fraction and region of cavitation bubbles. In extreme cases, more than 80% of the area on the suction side of the stator blade could be covered by cavitation bubbles. Moreover, the increase of pump rotating speed also changes the critical cavitation number and extends the cavitation range towards high speed ratio conditions not previously affected. These findings can provide guidance on how to choose the operating conditions of the hydraulic torque converter and how to improve its hydrodynamic performance and stability.

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Section: Validation Of Cfd Modelmentioning

confidence: 99%

The Effect of Rotating Speeds on the Cavitation Characteristics in Hydraulic Torque Converter

et al. 2022

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“…These bubbles then flow to an area of higher pressure, where their volume decreases and they burst. Cavitation can cause damage to the internal flow field of the torque converter, resulting in a decrease in the impeller's torque transmission capacity [3]. This can negatively impact the performance of the torque converter and even lead to damage to the metal structure, as well as the occurrence of vibration and noise [4].…”

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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“…For example, Kesy et al [1] used 16 structural parameters, including the inlet and outlet angles of the HTC blades, as design variables to carry out multi-objective optimization design for the cascade system. Xiong et al [2] used the surrogate model method to optimize the design of the HTC by considering the number of pump, stator, and turbine blades as design variables and the torque ratio and pump capacity factor as optimization goals. The results showed that the number of pump blades and stator blades had a significant effect on the performance of the converter, while the number of turbine blades had little influence.…”

Section: Introductionmentioning

confidence: 99%

Optimal Design of Torque Converter Blade Angle Based on Surrogate Model Method

Zhu

Li²,

Yang³

et al. 2023

J. Phys.: Conf. Ser.

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In this paper, the blade cascade system of the basic torque converter JQB2 is redesigned and changed into a hydraulic torque converter with an adjustable stator. Firstly, the basic torque converter cascade system is modified to realize the adjustable stator. In order to study the influence of the blade angles on the performance of the torque converter, the blade angles were parameterized. Taking the peak efficiency of the torque converter at the design opening as the optimization objection, the pump torque factor is not less than 90% of the initial torque converter as the constraint condition. The central composite experimental design method was used to generate 49 design points, and the Kriging surrogate model was selected to construct the response surface of efficiency and pump torque factor, and to verify the goodness of fit of the response surface, and then iteratively search for the optimal response surface. The peak efficiency of the optimized JQB2X is 89.7%, which is 1.6% higher than that before optimization. After optimization, the pump torque factor is 6.1×10−6, which is slightly lower than that of the basic torque converter, but it can still maintain the large capacity of the torque converter.

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Analysis of the Influence of the Number of Torque Converter Blades on Working Performance Based on the Response Surface Method

Cited by 4 publications

References 4 publications

The Effect of Rotating Speeds on the Cavitation Characteristics in Hydraulic Torque Converter

The Effect of Rotating Speeds on the Cavitation Characteristics in Hydraulic Torque Converter

Identification and Optimization Study of Cavitation in High Power Torque Converter

Optimal Design of Torque Converter Blade Angle Based on Surrogate Model Method

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