The flow between a pair of frictional plates in hydroviscous drive experiment rig was investigated. A simplified mathematic model for the steady and laminar flow was established for the flow in the gap of frictional pairs, and it was solved analytically and numerically respectively under the assumption of constant viscosity. The numerical results show that 1) inertia force causes the distribution of tangential velocity to be nonlinear, and the velocity value is smaller than that with neglecting the inertia force; 2) torque loss exists during the course of torque transmission, which is associated with the clearance, input and output rotational speed, and other factors. Furthermore, it is proportional to the 3rd power of the clearance; 3) there is an optimum output rotational speed interval for any clearance, owing to torque loss and rotational speed differences, and in the interval, the transmission efficiency is higher. On the basis of theoretical analysis, the torque transferring characteristics of hydroviscous drive was tested on the test bench. It is found that the changing trend of experiments results is basically in accordance with the trend of numerical curves.
［1］ APHALE C R, SCHULTZ W W, CECCIO S L. The influence of grooves on the fully wetted and aerated flow between open clutch plates ［J］. ASME Journal of Tribology, 2010, 132(1): 1-7． ［2］ YUAN Y Q, ATTIBELE P, DONG Y. CFD simulation of the flows within disengaged wet clutches of an automatic transmission ［J］. SAE Transactions, 2003, 112(3): 1760-1768． ［3］ YUAN Y Q, LIU EYSION A, Hill J, et al. An improved hydrodynamic model for open wet transmission clutches ［J］. ASME Journal of Fluids Engineering, 2007, 129(3): 333-337． ［4］ DAVIS C L, SADEGHI F, KROUSGRILL C M. A simplified approach to modeling thermal effects in wet clutch engagement: Analytical and experimental comparison ［J］. ASME Journal of Tribology, 2000, 122(1): 110-118. ［5］ HUANG J H, QIU M X, LIAO L L, et al. Numerical Simulation of flow field between frictional pairs in hydroviscous drive surface ［J］. Chinese Journal of Mechanical Engineering, 2008, 21(3): 72-75． ［6］ HUANG X G, WEI C G. Stability of oil film and output speed of hydroviscous drive affected by the pressure of control oil ［J］.Journal of Beijing Institute of Technology, 2001, 10(3): 266-271． ［7］ 孟庆睿,侯友夫.液体黏性调速起动瞬态过程数值模拟研究［J］. 摩擦学学报,2009, 29(5): 418-424． MENG Qingrui, HOU Youfu. Numerical simulation on transient behavior of hydroviscous drive speed regulating start ［J］. Tribology, 29(5):418-424． ［8］ 洪跃,刘谨,王云根.液体调速离合器中摩擦副热效应分析［J］. 中国工程科学,2003, 5(9):55-60． HONG Yue, Liu Jin, WANG Yungen. Thermal effect analysis of frictional disk in speeding clutch ［J］. Science Engineering, 2003, 5(9):55-60． ［9］ 陈宁.液体黏性传动(HVD)技术的研究［D］. 杭州：浙江大学,2003． CHEN Ning. Theoretical and application researches on hydroviscous drive［D］. HangZhou:Zhejiang University, 2005． ［10］ 邵威.液体黏性传动摩擦副的研究［D］. 杭州：浙江大学,2005． SHAO Wei. The research of the friction coupling on hydroviscous drive ［D］. HangZhou: Zhejiang University, 2005． ［11］ 魏宸官,赵家象. 液体黏性传动技术［M］.北京：国防工业出版社,1996: 51-82． ［12］ PATANKAR S V. Numerical heat transfer and fluid flow ［M］. Washington, D C: Hemisphere Publishing Corporation, 1980: 41-137．
