Computational Study on Flow through a Torque Converter

Fujitani, Katsuro; Himeno, Ryutaro; Takagi, Michitoshi

doi:10.4271/881746

Cited by 22 publications

(5 citation statements)

References 2 publications

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“…al. [5] computed the flow within a torque converter by assuming that the inlet boundary condition of each element is equivalent to the outlet boundary condition of the upstream-side element. Abe et.…”

Section: Introductionmentioning

confidence: 99%

Effect of Stator Shape on the Performance of Torque Converter

Khafagy¹,

Saleh²,

Elsherief³

2015

International Conference on Aerospace Sciences and Aviation Tec

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Torque converter is an enclosed hydrodynamic turbomachine, used in vehicles for smooth transmission of power and speed change from the engine to the transmission and torque multiplication. Torque converter consists of three major components: a pump that is connected to the engine shaft, a turbine connected to the transmission shaft, and a stator connected to transmission housing through a one-way clutch. Stator blades provide a guiding for the fluid flow. Stator is a main factor in controlling the torque ratio, pressure distribution and coupling point speed ratio. In this paper, the effects of the stator blade shape on overall performance have been investigated numerically at different speed ratios, using commercial software, ANSYS-CFX. Two torque converters with two different stator blade shapes are used for this study. The first stator has a large round nose, while the second stator is a thinner blade stator. At high speed ratio there is more blockage to flow of large inlet radius stator. Results showed that torque converter with thin blade resulted in an increase of torque ratio at fixed turbine and maximum efficiency. The bending of the thin blade caused a blockage to fluid flow.

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Section: Introductionmentioning

confidence: 99%

Effect of Stator Shape on the Performance of Torque Converter

Khafagy¹,

Saleh²,

Elsherief³

2015

International Conference on Aerospace Sciences and Aviation Tec

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“…), but also internal flow details, which are helpful in analysing the flow mechanism within the hydraulic coupling [3] . Fujitani Katsuro et al firstly analyzed the internal flow conditions through numerically solving the 3D incompressible N-S equations in a hydraulic torque converter in 1988 [4] . Mitra N K et al simulated the flow field in a hydraulic coupling in 2000, and summarized the influence of the coupling cavity types on its performance [5,6] .…”

Section: Introductionmentioning

confidence: 99%

Numerical comparisons of the performance of a hydraulic coupling with different pump rotational speeds

Luo¹,

Feng²,

Liu³

et al. 2013

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract.A hydraulic coupling is a hydrodynamic device for transmitting rotating mechanical power. It is widely used in the machinery industry because of its advantages of high energy transmission efficiency, shock absorption and good adaptability, etc. In this paper, SIMPLEC algorithm and SST k-ω turbulence model were employed to simulate the steady state flows at operating conditions of two different rotational speeds (3000r/min and 7500 r/min) of the pump of a specified hydraulic coupling model. The results indicate the existence of similarity in the distributions of the flow fields between the two speeds, but the efficiency at the optimum condition is larger with higher rotational speed. It is concluded that the similarity principle of the efficiency of the hydraulic couplings does not apply in this case due to the relatively high rotating speed and small geometric specifications. It is also shown that the radially stratified pressure distribution on the torus section becomes more obvious with larger speed ratios, since the centrifugal movement plays more dominant roles over the circulating movement in these situations. When the speed ratio is small, with the completion of the circulating flow, the pressure distribution presents in a more circular pattern around the neutral zone of the torus section. IntroductionEnergy transmission by the utilization of the hydraulic coupling is one of the energy-saving technologies [1] . A hydraulic coupling can realize flexible connection by using fluid kinetic energy to transmitting power, which has some advantages in engineering applications, e.g., good adaptability and shock absorption, etc. Due to the complexity of the three-dimensional incompressible viscous flows, and the gas-liquid two-phase distribution variations at different working conditions in a partially filled hydraulic coupling, precise theoretical analysis of the flows and the hydraulic losses remains difficult.The design of the hydraulic coupling has been evolved from the traditional one-dimensional beam method, to the optimization design based on three-dimensional CFD analysis [2] . CFD analysis of the flows in the hydraulic coupling has gain prevalence over the years, since it provides not only the external characteristic (e.g., transmitted torque, etc.), but also internal flow details, which are helpful in analysing the flow mechanism within the hydraulic coupling [3]

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“…In order to analysis and calculation, the following assumptions are made as follows [3][4][5][6][7][8]: Every component of the torque converter is assumed to be absolutely rigid body; the dynamic characteristics are studied, ignoring the variation of the temperature of the working medium; oil leakage between two impellers are assumed to be negligible, and the equal amount of working oil flows from the up-stream to the down-stream.…”

Section: A Basic Assumptionsmentioning

confidence: 99%

Analysis of the torque distribution characteristics of dual-turbine torque converter

Cai

Ya-xu

et al. 2010

2010 8th World Congress on Intelligent Control and Automation

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The three-dimensional numerical simulation and analysis of the flow field in the dual-turbine torque converter was implemented with CFD, more details of the internal flow field in the torque converter and the torque distribution between the first turbine and the second turbine was analyzed. The non-steadystate solver has been used in the transient analysis of the internal flow in the dual-turbine torque converter, and the sliding-mesh theory is used in each interface of the inlet and outlet, making various components with the different rotary speed be united and calculated.

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Computational Study on Flow through a Torque Converter

Cited by 22 publications

References 2 publications

Effect of Stator Shape on the Performance of Torque Converter

Effect of Stator Shape on the Performance of Torque Converter

Numerical comparisons of the performance of a hydraulic coupling with different pump rotational speeds

Analysis of the torque distribution characteristics of dual-turbine torque converter

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