Experimental Investigation of Rotor/Rotor Interaction in a Hydrodynamic Torque Converter Using Hot-Film Anemometry

Browarzik, Volker

doi:10.1115/94-gt-246

Cited by 17 publications

(6 citation statements)

References 7 publications

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“…Kraus, Flack, Habsieger, Gillies, and Dullenkopf (2005) studied the unsteady flow induced by the pump/turbine blades passing. It was observed that the turbine inlet flow is significantly periodic and the pump exit flow shows independence of the turbine blades passing, similar to the results obtained by Browarzik (1994). Brun and Flack (1997) measured the unsteady velocity field in the turbine through laser velocimetry at two typical speed ratios: 0.065 and 0.800.…”

Section: Introductionsupporting

confidence: 78%

Numerical investigations of the flow induced oscillation of a torque converter

Liu

Yan

Wei

2018

Engineering Applications of Computational Fluid Mechanics

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The flow induced oscillation of a three-element torque converter was investigated numerically under various operational conditions. A two-way coupling fluid-structure interaction simulation was performed using ANSYS -Fluent along with the ANSYS Transient Structural module. The fluid pressure excitation and the dynamic structure response were investigated at various turbine/pump rotation speed ratios SR ∈ [0.00.8]. The maximum pressure blade load and structural deflections were observed in the stall condition, corresponding to the highest torque transmission ratio. The pressure pulsations and structure oscillations were monitored at locations selected on the basis of time-averaged distributions. The turbine oscillations were dominated by the frequency of pump blade passing at SR = 0.0. The stator always oscillated under impact from the upstream flow with the dominating pump shaft frequency. Both the time-averaged and instantaneous features revealed that the pump oscillations were almost independent of SR.

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Section: Introductionsupporting

confidence: 78%

Numerical investigations of the flow induced oscillation of a torque converter

Liu

Yan

Wei

2018

Engineering Applications of Computational Fluid Mechanics

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“…6 as curve (3). Compared with the experimental data, it results in values that are too small by about 17%.…”

Section: (7) For Reynolds Numbersmentioning

confidence: 97%

“…Unsteady flow between the pump and turbine impellers was measured by hot-film anemometry by Browarzik (3) in a detailed study of the effect of the pump-turbine interaction on flow fields. Gruver, Flack and Brun (4) - (7) used a laser Doppler velocimeter to investigate the internal flow in the pump and turbine impellers.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Flow in the Lock-up Clutch of an Automotive Torque Converter

Ejiri

2006

JSME international journal. Ser. B, Fluids and thermal engineer

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The flow through the single-plate lock-up clutch in an automotive torque converter with a 250-mm nominal diameter was numerically investigated using a CFD code. The flow was computed under various clearances between the lock-up piston and the torque converter cover. The stable location of the lock-up piston was determined so that the thrust acting on it became zero. The computation results showed that the fluid flowed outwards in the narrow channel between the lock-up clutch facing and the converter cover, whereas the flow reversed inwards near the lock-up piston surface upstream and downstream of the narrow channel in most cases. Along the outer surface of the axial flow channel near the exit, the flow also reversed far upstream of the channel. The computation results well predicted the stable position of the lock-up piston. It is noteworthy that the sharp increase in clearance in the coupling range can be clearly captured with this method.

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“…Others have performed studies of the flow fields in torque converters, including Browarzik (1994), Ejiri and Kubo (1998), Marathe and Lakshminarayana (1997), and Watanabe and colleagues (1997). Efforts at the University of Virginia have used nonintrusive laser velocimetry to map out the detailed flow fields discussed by, for example, Brun and Flack (1994) and Whitehead (1995).…”

mentioning

confidence: 97%

Flow Characteristics at the Pump-Turbine Interface of a Torque Converter at Extreme Speed Ratios

Habsieger¹,

Flack²

2003

The International Journal of Rotating Machinery

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The average velocity field at the pump-turbine interface in a scaled version of a truck torque converter was studied. Seven different turbine-to-pump rotational-speed ratios were examined, ranging from near stall (0.065) to overspeed (1.050) so as to determine the effect of the speed ratio on the flow field and on the mass flow rate. Laser velocimetry was used to measure the flow velocity through the pump's exit and the turbine's inlet plane. At the pump's exit, as the speed ratio increases, the high velocities move to the pressure-shell corner and then to both the core-suction and the pressureshell corners. Concentrated velocity gradients are largest at the lowest speed ratio, but areas of velocity gradients are largest near the coupling point. Near the coupling point, the flow field is most nonuniform, which yields a highly periodic flow into the turbine inlet. Above the coupling point, the high velocity remains in the pressure-shell corner but separation is seen to develop at the highest speed ratio. At the turbine's inlet, reverse flow is seen at low speed ratios and is an indicator of flow leakage through the core. Velocity gradients are very large at low speed ratios. As the speed ratio increases to the coupling point, the high velocities remain on the shell side. Above the coupling point, the high-velocity flow migrates from the shell side to the core side. The mass flow rate decreases significantly and nonlinearly with the increase of the speed ratio, but for speed ratios greater than 1.000, the negative slope decreases.Torque converters are commonly used in cars, buses, locomotives, and construction equipment as a mean of smooth torque transmission between the engine and the automatic transmission and to provide torque amplification during start-up conditions. The typical torque converter is a recirculating hydrodynamic, mixed-flow turbomachine (containing both radial and axial flow) with three independent blade cascade elements that govern the internal flow field. These three elements are the pump, which energizes the working fluid and which is connected to the engine; the turbine, which extracts the energy from the flow and translates it into output torque; and the stator which, ideally, redirects the turbine's exit flow back into the pump with a zero flow incidence at a specific design speed ratio. The pump and turbine are rotating at different angular speeds while the stator is either locked or allowed to float freely. Because of the significant curvature of the flow path and the high interaction among these three elements, the internal flow field is highly three-dimensional.The flow field, the torque, and the efficiency curves are normally determined only from the zero speed ratio (turbine has stopped) to the coupling point (turbine torque and pump torque are equal), which typically occurs at a speed ratio of 0.85 to 0.90. Performance characteristics are normally required only in the range from stall to cruise. A torque converter, however, can be operated at high positive speed ratios beyond the cru...

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Experimental Investigation of Rotor/Rotor Interaction in a Hydrodynamic Torque Converter Using Hot-Film Anemometry

Abstract: Unsteady flow measurements were performed to investigate the internal flow field of a torque converter, especially unsteady rotor/rotor-interaction in the region between pump exit and turbine inlet. Superscripts simple ensemble average double ensemble average

Cited by 17 publications

References 7 publications

Numerical investigations of the flow induced oscillation of a torque converter

Numerical investigations of the flow induced oscillation of a torque converter

Analysis of Flow in the Lock-up Clutch of an Automotive Torque Converter

Flow Characteristics at the Pump-Turbine Interface of a Torque Converter at Extreme Speed Ratios

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