| With the rapid development of modern industry,energy saving has become the survival of industrial enterprises,Hydro-viscous Clutch with its small friction loss characteristics,has been applied in many areas of engineering applications.In order to make the Hydro-viscous Clutch better meet the high speed,heavy load,high precision and other complex conditions,In this paper,take the Hydro-viscous Clutch as the starting point,the fluid between the pair of friction plates is numerically calculated by FLUENT computational fluid dynamics software.Analyzed the external factors influencing of the fluid transmission performance in the gap of the double circular arc groove,and studied the cavitation phenomenon and the influence factors on cavitation.Analyzed the influence of the structural parameters of the double circular arc groove friction plate on the oil film transmission performance.On the basis of this,the structural parameters are optimized to have better oil film transmission torque and excellent heat dissipation capacity,which provides the theoretical basis for the design of friction plate with double circular arc groove structure.The main contents of this paper are as follows:1)Introduced the method of numerical calculation of fluid flow field of Hydro-viscous Clutch,including the basic theory of liquid viscous transmission,mathematical model of liquid viscous transmission,turbulence model and cavitation model.According to their respective characteristics,to choose the model needed in this paper,which provides the theoretical basis and reference for the numerical calculation.Selected the structure of the double-arc groove friction plate which is suitable for heavy-duty applications.2)Analyzed the external factors influencing the transmission performance of double circular arc groove oil film.Studied the effects of oil viscosity,oil inlet temperature and rotational speed on oil film transmission torque.Emphatically analyzed the cavitation phenomenon and the factors influencing the cavitation degree during the bonding process.Compared the influence of various parameters before and after cavitation on oil film torque transmission.The results show that: the viscosity of the working oil and the speed of the active friction plate have a great influence on the cavitation,with the increase of the viscosity and the increase of the rotational speed of the active friction plate,the cavitation volume fraction becomes apparent.The rotational speed has the same effect on the size and location of the cavitation area.Working oil surface tension and oil inlet pressure have little effect on cavitation.The viscosity of the working oil and the rotational speed of the active friction plate was positively correlated with the oil film transfer torque,while the oil inlet temperature was negatively correlated with the oil film transfer torque.Working oil viscosity is0.015Pa·s-0.025Pa·s and inlet temperature is 45?-55? the transfer performance is better,the speed must be controlled within a reasonable range,can not be too high.Considering the cavitation phenomenon,the oil film transfer torque has a different degree of reduction compared to the absence of cavitation.3)Analyzed the working characteristics of different friction plate groove,deeply researched the thin film fluid with double circular arc groove.Analyzed the oil film transfer performance when the parameters of double circular arc trenches were changed.The structural parameters mainly include oil groove angle,oil tank depth and oil tank number.Mainly considered the influence of these parameters on the transmission performance,include oil film pressure,temperature and transmission torque,compared the change of pressure and temperature before and after cavitation.Finally,through the control variable method,compared and optimized the initial angle,depth and number of the oil tank.The initial angle of the double circular arc groove is 47.5°,the groove depth is 0.3mm,the number of oil grooves is 57,the maximum torque can be transmitted.At this time,friction plate has a good cooling capacity,which provides the theoretical basis for the design of friction plate with double circular arc groove structure. |
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