Two-Phase MRF Model for Wet Clutch Drag Simulation

Wang, Pengchuan; Katopodes, Nikolaos D.; Fujii, Yuji

doi:10.4271/2017-01-1127

Cited by 15 publications

(9 citation statements)

References 13 publications

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“…Conversion of motion coordinate system is required given the functional limitations of computational software. In the simulation, a relative coordinate system is established using the tank body as a reference, the tank advancement is achieved with a multiple reference frame (MRF) model, and the track rolling is simulated by setting moving walls [27,28]. In Fig.…”

Section: Simulation Conditionsmentioning

confidence: 99%

Study of Spatial Distribution Characteristics for Dust Raised by Vehicles in Battlefield Environments Using CFD

et al. 2021

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For a pulsed laser transmitted in the raised dust from battlefield vehicle movement, the premise of obtaining its transmission properties and anti-jamming method is to acquire the spatial distribution rules of dust mass concentration. In this study, the emission mechanism for vehicle-raised dust in the battlefield environment is analyzed, as well as various influencing factors of the dust emission velocity. A finite volume method (FVM)-based model for simulating the spatial dispersion of dust raised by a certain moving tank is built, and the effects of mass flow rate, traveling speed, wind speed and wind direction on the spatial distribution of dust mass concentration are explored in the battlefield environment. The results show that the raised dust is plume-shaped within the computational domain, and the spatial mass concentration of plume is positively correlated with the mass flow rate. Besides, it is necessary to determine the impact of tank travelling speed on the spatial mass concentration of dust based on the relationship between the travelling speed and the dust mass flow rate. Although front wind reduces the spatial mass concentration of dust plumes, the reduction rate decelerates when the wind speed exceeds 4 m/s. Crosswind leads to the deflection and decreased mass concentration of dust plumes. Under varying wind directions, the variation of crosswind component exerts a more pronounced influence on the spatial mass concentration of dust than that of the front wind component. This study provides a technical support for the further study of near-ground laser weapon system against vehicle dust interference in the battle field. INDEX TERMS Battlefield Environment; Vehicle-raised Dust; Spatial Mass Concentration; Finite Volume Method (FVM).

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Section: Simulation Conditionsmentioning

confidence: 99%

Study of Spatial Distribution Characteristics for Dust Raised by Vehicles in Battlefield Environments Using CFD

et al. 2021

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“…A schematic diagram of the present experimental apparatus is shown in Figure 4. The two motors (7,8) are used to provide torque for grooved discs and steel discs, respectively, through dynamic transmission system (3,4,6,9,11,12,13). The core of the test bench is clutch assembly (2), which could simulate the actual working condition of disengaged wet clutch ( Figure 5).…”

Section: Description Of the Experimentsmentioning

confidence: 99%

“…Then the experimental data of drag torque can be calculated using the data of Torque Meter (10) minus that of Torque Meter (5), regardless of mechanical loss of transmission. Specially, if there is no torque transmitted from Motor 1 (7), the data of Torque Meter (5) is the value of drag torque. The accuracies of the sensors in the test are shown in Table 1.…”

Section: Description Of the Experimentsmentioning

confidence: 99%

“…It mainly includes outer support sleeve (11) and angular gear (5), among which (11) works with friction disc (6) by splines. And the position of friction disc (6) is fixed by snap ring (7). The limit disc (2) is designed in advance, which is fixed at angular gear (5) by screw and has no clearance with the friction disc (6).…”

Section: Description Of the Experimentsmentioning

confidence: 99%

“…He built a non-grooved, steady-state and two-phase flow model with FLUENT, discovering that air would enter the clearance flow field at a certain critical rotational speed; consequently, the drag torque decreased sharply. Wang et al 7 considered that there was an air–fluid interface in the parallel rotation gap flow field, and he also applied the volume of fluid (VOF) method to calculate it within non-grooved and grooved friction pair. Although CFD made it more convenient for people’s research, it could only calculate the values of each node, which cannot be applied to explain the formation mechanism and the effect of each factor on drag torque.…”

Section: Introductionmentioning

confidence: 99%

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Model for the prediction of drag torque characteristics in wet clutch with radial grooves

Zhang

Wei

2018

Proceedings of the Institution of Mechanical Engineers, Part D:

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Drag torque can cut down the efficiency of the vehicle transmission system. So it should be reduced on the premise of normal vehicle lubrication and heat dissipation. The purpose of this paper is to analyze the variation rule of drag torque in single-plate wet clutch from the perspective of flow rate, density, and viscosity. In the theoretical model of drag torque, the flow field is divided into oil film area and cavitation zone. Based on the mass flow conservation and viscosity–pressure equation, the equivalent density and viscosity of each node in each region are obtained. Then the total drag torque is calculated through the sum of each node’s torque. Finally, the curves of drag torque with rotational speed under different working conditions are obtained by numerical calculation, and they have been tested and verified. Through this research, the following conclusions can be reached: the rotational speed of the peak of drag torque is near the maximum speed where full oil film lubrication is realized. While temperature declines, it will lead to higher viscosity, then the speed of the lubricant along the radial direction will decrease, resulting in the increase in maximum speed of full oil film lubrication under the same oil supply; accordingly, the peak of drag torque will rise. If the flow rate of oil supply is increased, the maximum speed where full oil film lubrication is realized will be higher; consequently, the maximum drag torque will be improved. When clearance becomes wider, the cross-sectional area of the radial flow will be larger, then the maximum speed of full oil film lubrication under the same oil supply will be decreased, thus the peak of drag torque will decline.

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Analyse von Schleppmoment und Strömungsverhalten einer nasslaufenden Kupplungslamelle mit Seriennutdesign durch Messung und CFD-Simulation

Neupert

Bartel

2020

Proceedings

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In geöffneten nasslaufenden Kupplungen wird ein erheblicher Anteil der Verlustleistung durch die viskose Scherung des Kühlöls zwischen den einzelnen Lamellen verursacht. Zur Optimierung des Wirkungsgrades ist es das Ziel diese Verluste weitgehend zu minimieren, was durch Prüfstandsversuche oder Berechnungen erfolgen kann. Der Beitrag behandelt die messtechnische und numerische Untersuchung des Schleppmoments am Beispiel eines in Serie eingesetzten komplexen Nutdesigns. Für die Messungen kommt ein Einlamellenprüfstand zum Einsatz, mit dessen Hilfe die Abhängigkeiten des Schleppmoments herausgearbeitet und die Strömungssituationen detailliert analysiert werden können. Für einen exemplarischen Betriebszustand werden die Messwerte mit den Berechnungsergebnissen eines leistungsfähigen transienten 3D -CFD Simulationsmodells verglichen.

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Two-Phase MRF Model for Wet Clutch Drag Simulation

Cited by 15 publications

References 13 publications

Study of Spatial Distribution Characteristics for Dust Raised by Vehicles in Battlefield Environments Using CFD

Study of Spatial Distribution Characteristics for Dust Raised by Vehicles in Battlefield Environments Using CFD

Model for the prediction of drag torque characteristics in wet clutch with radial grooves

Analyse von Schleppmoment und Strömungsverhalten einer nasslaufenden Kupplungslamelle mit Seriennutdesign durch Messung und CFD-Simulation

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