Laminar flow in the gap between two rotating parallel frictional plates in hydro-viscous drive

Huang, Jiahai; Wei, Jianhua; Minxiu, Qiu

doi:10.3901/cjme.2012.01.144

Cited by 21 publications

(22 citation statements)

References 11 publications

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“…On top of that, the need for the extraction of generalized results, able to provide a general insight in the complex dynamics of the clutch along with the excessive theoretical background existing in the analytical and experimental study of flows between rotating discs, has concluded in the extraction of analytical or empirical expressions regarding the calculation of the necessary flow parameters. This procedure is based on the derivation of truncated forms of the Navier-Stokes equations set, which is analytically solvable [3,16]. However, as indicated in this work, those truncated forms are not valid throughout the total operational envelope of the device, as the terms neglected may lead to considerable truncation errors.…”

Section: Geometry Modifications and Basic Parametersmentioning

confidence: 99%

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Nondimensional Characterization of the Operational Envelope of a Wet Friction Clutch

et al. 2020

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In recent years, multidisc wet friction clutches are used in demanding powertrains of automatic and dual clutch transmissions targeting high efficiency and smoothness during gearshift. However, the developed flow pattern between the clutch discs is significantly complex and the Computational Fluid Dynamics (CFD) methods employed are quite demanding in terms of computational cost. To deal with this issue semi-analytical solutions were derived, which are limited, however, to specific problems, in order to obtain handy expressions, while also providing insight to the wet clutch physics. Nevertheless, this lack of global validity is counterbalanced by the fact that the governing equations become analytically solvable at specific operational conditions with satisfactory accuracy, provided that the simplifications rendering the truncated terms inactive hold true. In this work, a quantitative way of determining the relative weight of each term of the Navier-Stokes (NS) equations set is presented, based on the post-processing of CFD results using the Buckingham “π-theorem”. The sets of nondimensional numbers created were used to describe and model the physics of the wet clutch.

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Section: Geometry Modifications and Basic Parametersmentioning

confidence: 99%

“…Therefore, the second order differential equation for pressure was obtained, which was integrated with respect to (r) under the boundary conditions of Equation 6and the final expression for pressure was derived. The two cases considered corresponded to the following system of truncated Navier-Stokes equations [3,16].…”

Section: Analytical Solutionsmentioning

confidence: 99%

Nondimensional Characterization of the Operational Envelope of a Wet Friction Clutch

et al. 2020

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“…2. The flow is considered to be steady, laminar, incompressible [10], isothermal, axisymmetric and the fluid is newtonic, so that:…”

Section: Analytical Modelingmentioning

confidence: 99%

“…(3-a), (3-b) and the boundary conditions hold from Eqs. (7) to (10). The parameters are: As previously mentioned, Eqs.…”

Section: Cfd Model Setupmentioning

confidence: 99%

Fast modelling and simulation of the dynamic behaviour of a wet multidisc clutch during the engagement phase

et al. 2019

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In recent years multidisc wet friction clutches are of great importance to manufacturers of automatic transmissions (ATs) for the automotive industry, particularly since the introduction of double-clutched ATs. Their main advantage compared to their dryfriction counterparts is that they ensure smooth engagement, high reliability and long service life. Their progressive engagement due to the developed Couette flow between the discs enables them to be used both as clutches and as brakes in order to control power flow in simultaneously engaged geared shafts in the AT. Due to the coupled nature between the mechanical and the fluid dynamics regimes governing their operation, these systems are highly complex to be treated analytically and instead numerical approaches have proven to provide better results. However, the numerical treatment of such problems provides only case-specific results, which cannot be generalised and are not able to provide a general insight in the complex dynamics of the device. Furthermore the computational cost and the associated modelling and simulation effort during the design phase is high, making the incorporation of such methods in iterative design processes and algorithms counterproductive. In this paper the modelling of the dynamic behaviour of a wet multidisc clutch during the engagement phase is performed, via the combination of analytical and numerical methods and conclusions are drawn about the effect of the main geometric, kinematic and dynamic design parameters on the clutch's response. The dynamic modelling is performed by applying the principle of linear and angular momentum on each disc. The effect of the fluid film is taken into account through the solution of the governing Navier-Stokes equations via CFD analysis or by the use of semianalytical solutions with high accuracy, where applicable. Therefore both the developed pressure field and the torque of the fluid film are calculated efficiently and used in the simulation of the system. The flow is assumed to be laminar and the discs rigid and flat.

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“…The primary improvement of this model over the existing ones was the inclusion of the surface tension. Huang, J. H. et al [10,11] investigated the flow field of the oil film between frictional pairs in hydro-viscous drive test rig. Temperature was found to have influence on the dynamic characteristics of the oil film.…”

Section: Introductionmentioning

confidence: 99%

Study of Flow between Non-Isothermal Disks in Hydro-Viscous Drive

Chen

2018

Tribology Online

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The film flow between the disks is the critical factor in the design of hydro-viscous drive. In the previous work dealing with the flow in the gap, few authors considered the effect of non-isothermal interface on the flow. In order to investigate the dynamic behavior of the oil film between non-isothermal friction pair in hydro-viscous drive, the flow field of the oil film between the disks is presented with consideration of four representative temperature models. Parameters related to the flow, such as temperature, pressure, velocity, shear stress and viscous torque are obtained by means of numerical simulation. The results show that non-isothermal interface results in temperature distribution profiles that diverge from the ideal parabolic curve. Both the discrepancies about film pressure and radial velocity at the outlet are vulnerable to temperature variation derived from a set of frictional pair. Tangential velocity profiles diverge from inlet to outlet due to the non-isothermal interface. Shear stress profiles show the opposite trend caused by the substantial variation about the oil viscosity. The research results lay a theoretical foundation for the reasonable designs of hydro-viscous drive. Keywordshydro-viscous drive, numerical analysis, oil film, non-isothermal interface, computational fluid dynamics(CFD)

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Laminar flow in the gap between two rotating parallel frictional plates in hydro-viscous drive

Cited by 21 publications

References 11 publications

Nondimensional Characterization of the Operational Envelope of a Wet Friction Clutch

Nondimensional Characterization of the Operational Envelope of a Wet Friction Clutch

Fast modelling and simulation of the dynamic behaviour of a wet multidisc clutch during the engagement phase

Study of Flow between Non-Isothermal Disks in Hydro-Viscous Drive

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