Abstract
Wet multi-plate clutches and brakes are important components of modern powershift transmissions and industrial drive trains. In the open state, drag losses occur due to fluid shear as load-independent losses. Determination of drag losses can be done by experiment or by CFD simulation. CFD simulation has many advantages over the experiment process, but often has the strong disadvantage of high computational times and in consequence, strongly simplified models. Therefore, the target is to develop an efficient and validated model to compute drag losses for any clutch design in a short computational time.
This work presents an innovative and validated CFD model to calculate drag losses of wet clutches. To ensure a convenient implementation of the model with high computational efficiency and quality at the same time, the commercial Software Simerics MP+ is used. Because of efficient modeling and solvers, the CFD model considers the geometry of a complete clearance between a steel and friction plate. This enables the model to calculate the drag losses for any possible groove design, which is a tremendous advantage in comparison to state of the art models, which often use circumferential symmetry. Furthermore, the model development is focused on a short calculation time: computational time is very short, which enables the overnight calculation of a whole drag-torque-differential speed curve. This allows variational calculations and at the same time, detailed investigations that are important both in early and advanced stages of development.
Extensive measurements on a component test rig using automobile series production parts allow a thorough validation of the model. The influences of changes in operating conditions, groove design, differential speed, oil injection temperature and volumetric flow rate are shown both in the measurements and in the simulation results.
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References
Dräxl T, Pflaum H, Stahl K (2015) Neue Erkenntnisse über Schleppverluste an Lamellenkupplungen. VDI-Fachtagung “Kupplungen und Kupplungssysteme in Antrieben”. VDI-Berichte Nr. 2245:149–161
Oerleke C (2000) Einflußgrößen auf die Schleppmomente schnellaufender Lamellenkupplungen in Automatgetrieben. Diss., Bundeswehr-Univ
Neupert T, Bartel D (2015) Schleppmomentuntersuchungen an nasslaufenden Kupplungslamellen mithilfe von Prüfstandsmessung und CFD-Simulation: analysis of the drag torque in a disengaged wet clutch disc by test rig measurements and CFD-simulations. VDI-Fachtagung “Kupplungen und Kupplungssysteme in Antrieben”, VDI-Berichte Nr. 2245
Albers A, Ott S, Basiewicz M et al (2017) Variation von Nutbildern mittels generativer Verfahren zur Untersuchung von Schleppverlusten in Lamellenkupplungen. In: VDI-Fachtagung Kupplungen und Kupplungssysteme in Antrieben. VDI Verlag GmbH, Düsseldorf
Grötsch D, Niedenthal R, Völkel K et al (2019) Effiziente CFD-Simulationen zur Berechnung des Schleppmoments nasslaufender Lamellenkupplungen im Abgleich mit Prüfstandmessungen. Forschung im Ingenieurwesen (83):227–237. https://doi.org/10.1007/s10010-019-00302-3
Neupert T, Bartel D (2019) High-resolution 3D CFD multiphase simulation of the flow and the drag torque of wet clutch discs considering free surfaces. Tribol Int (129):283–296. https://doi.org/10.1016/j.triboint.2018.08.031
Yashwanth BL, Ngo D, Schroeder D et al (2018) Drag and cooling characteristics of circular pin-fin groove pattern of a multi-plate clutch pack using CFD. In: SAE international400 commonwealth drive, Warrendale, PA, United States
Behzad M, Saxena V, Schaefer M (2018) Thermal-hydrodynamic optimization of grooves in a wet clutch. In: Dritev - drivetrain for vehicles, EDrive, transmissions in mobile machines: international VDI Congress, June 27 and 28, Bonn, Nichtredigierter Manuskriptdruck. VDI Verlag GmbH, Düsseldorf, pp 101–117
Mahmud SF, Pahlovy SA, Kubota M et al (2016) Multi-Phase simulation for studying the effect of different groove profiles on the drag torque characteristics of transmission wet clutch. In: SAE 2016 world congress and exhibition. SAE international400 commonwealth drive, Warrendale, PA, United States
Pahlovy SA, Mahmud S, Ogawa M (2018) Development of new groove design for reduction of drag torque or spin loss of disengaged wet clutches in the high speed region. SAE Technical Paper Nr. 2018-01-1300. https://doi.org/10.4271/2018-01-1300
Rudloff M, Bartel D, Deters L (2011) Simulation der Strömung in nasslaufenden Lamellenkupplungen. In: Kupplungen und Kupplungssysteme in Antrieben 2011: VDI-Fachtagung mit Fachausstellung, Wiesloch 2011, Nichtred. Ms-Dr. VDI-Verl., Düsseldorf
Neupert T, Bartel D (2017) Einfluss des Nutdesigns von nasslaufenden Kupplungslamellen auf das Strömungsverhalten im Lüftspalt. In: VDI Fachtagung - Kupplungen und Kupplungssysteme in Antrieben 2017. VDI Verlag GmbH, Düsseldorf
Singhal AK, Athavale MM, Li H et al (2002) Mathematical basis and validation of the full cavitation model. J Fluids Eng 124(3):617. https://doi.org/10.1115/1.1486223
Prüfung von Mineralölen und verwandten Stoffen - Bestimmung des Viskosität-Temperatur-Verhaltens – Richtungskonstante m: Prüfung von Mineralölen und verwandten Stoffen DIN 51563(51563)
Prüfung von Mineralölen und verwandten Stoffen - Bestimmung der Dichte DIN 51757(51757)
Orszag SA, Yakhot V, Flannery WS, Boysan F, Choudhury D, Maruzewski J, Patel B (1993) Renormalization group modeling and turbulence simulations. In: International conference on near-wall turbulent, Tempe, Arizona
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Groetsch, D., Niedenthal, R., Voelkel, K., Pflaum, H., Stahl, K. (2021). Efficient CFD Simulation Method for Calculation of Drag Torque in Wet Multi-plate Clutches in Comparison to Test Rig Results. In: CTI SYMPOSIUM 2019. Proceedings. Springer Vieweg, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-61515-7_15
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DOI: https://doi.org/10.1007/978-3-662-61515-7_15
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