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为揭示电控硅油风扇离合器工作腔内硅油剪切稀化与黏温耦合作用对油膜传矩能力的影响，开展二甲基硅油稳态流变实验，获得不同温度和剪切速率条件下的黏度变化规律，建立温度-剪切耦合黏度模型，并将其引入工作腔CFD仿真。通过对比恒黏度、单一剪切稀化和温度-剪切耦合三种黏度处理方式，分析不同转速下油膜速度场、压力场、壁面剪切应力和传递转矩变化规律，并利用开环转矩试验进行验证。结果表明，硅油黏度随温度升高和剪切速率增大而衰减，高剪切区域主要分布于外径区域、端面油膜与柱面油膜过渡区及局部几何突变位置。主动轴转速由1 000 r/min升至2 300 r/min时，试验传递转矩由30.72 N·m增至138.19 N·m,但中高转速区滑差率逐渐增大，表明局部强剪切与温升会削弱高转速工况下油膜转矩的线性增长。与恒黏度模型和单一剪切稀化模型相比，温度-剪切耦合模型预测结果与试验结果更接近，平均相对误差约为3%,可更准确表征局部黏度衰减导致的油膜传矩非线性特征。
Abstract：To elucidate the effects of shear thinning and viscosity-temperature coupling on the oil-film torque transmission capability of an electronically controlled silicone-oil fan clutch, steady-state rheological experiments were conducted on dimethyl silicone oil to obtain its viscosity variation over a range of temperatures and shear rates. A temperature-shear coupled viscosity model was then established and incorporated into CFD simulations of the clutch working chamber. By comparing three viscosity treatments-constant viscosity, shear-thinning only, and temperature-shear coupling-the variations in oil-film velocity field, pressure field, wall shear stress, and transmitted torque under different rotational speeds were analyzed and further validated through open-loop torque tests. The results show that silicone-oil viscosity decreases with increasing temperature and shear rate, and that high-shear regions are mainly concentrated in the outer-radius region, the transition zone between the end-face oil film and the cylindrical oil film, and local geometric discontinuities. As the driving-shaft speed increased from 1 000 to 2 300 r/min, the experimentally measured transmitted torque increased from 30.72 to 138.19 N·m, while the slip ratio gradually increased in the medium-and high-speed ranges, indicating that local intense shear and temperature rise suppress the linear growth of oil-film torque under high-speed operating conditions. Compared with the constant-viscosity model and the shear-thinning-only model, the temperature-shear coupled model showed better agreement with the experimental results, with an average relative error of about 3%, and more accurately captured the nonlinear oil-film torque transmission characteristics caused by local viscosity attenuation.
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基本信息:
DOI：10.15923/j.cnki.cn22-1382/t.2026.3.01
中图分类号:U464.138.4
引用信息:
[1]崔高健,陈禹辛,李绍松,等.剪切稀化与黏温耦合作用下硅油风扇离合器油膜传矩特性[J].长春工业大学学报,2026,47(03):193-201+307.DOI:10.15923/j.cnki.cn22-1382/t.2026.3.01.
基金信息:
吉林省科技厅发展计划项目(20220201042GX)
2026-06-15
2026-06-15