Stefano Terzi, Massimo Milani, Luca Montorsi, Bernhard Manhartsgruber,
"Experimental and numerical analysis of the multiphase flow distribution in multi plate wet clutches for HVT transmissions under actual operating conditions"
: 2018 Global Fluid Power Society PhD Symposium (GFPS), 18-20 July 2018, Samara, Russia, Seite(n) 1-6, 9-2018
Experimental and numerical analysis of the multiphase flow distribution in multi plate wet clutches for HVT transmissions under actual operating conditions
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2018 Global Fluid Power Society PhD Symposium (GFPS), 18-20 July 2018, Samara, Russia
The paper investigates the multiphase flow through the plates of multi plate wet-clutches for hydro- mechanical variable transmission in order to address the performance of the lubricating systems and its influence on the thermo-mechanical stresses on the plates. The lubricating oil distribution is very difficult to measure experimentally on a real geometry, therefore, a numerical model for the prediction of the flow distribution within the clutch plates is proposed. The volume of fluid approach is used to model the multi-phase flow that characterizes the component and a modular approach is defined to reproduce accurately the real geometry. Furthermore, the numerical modeling is validated against measurements carried out on an ad-hoc designed test rig. The testing facility replicates both the geometry of a real clutch and the actual operating conditions. Transparent PMMA components and fast imaging techniques are used to capture the multiphase flow pattern within the gear distributor chamber, while a 3D printed component and a specific collector system have been designed in order to reproduce the disks position and measure the oil distribution through the plates' clearances by varying the working conditions. A good agreement between the numerical and the experimental results was found and the analysis highlighted the importance of modeling the multi-phase nature of the lubrication process for the accurate prediction of the oil distribution within multi plate wet-clutches.)