为研究热流固耦合下液膜密封动态追随特性，基于小扰动法及热动力润滑理论，考虑非补偿环轴向振动、角向偏摆，建立补偿环三自由度运动方程，对比并分析纯流场和热流固耦合模型下力学元件参数、操作工况参数、结构参数对动态追随性的影响。结果表明：在热流固耦合模型下求解的液膜密封扰动量略小于纯流场模型下求解的扰动量；增加激励振幅，弹簧刚度和O型圈阻尼均会导致扰动增大，动态追随性变差；减小转速、增加介质压力会导致动态特性系数增加，有利于提高动态追随性；减少槽数会提高动态追随性，且在槽数给定时，槽深17μm，槽坝比0.8，螺旋角22°的结构参数设定会得到更好的动态追随性。
Abstract
To thoroughly examine the dynamic tracking features of liquid film seals in the context of thermo-fluid-solid coupling, the small perturbation method and thermo-hydrodynamic lubrication theory are utilized. Accounting for non-compensated ring axial vibration and angular yaw, a motion equation with three degrees of freedom is formulated for the compensation ring. The influence of mechanical component parameters, operating condition parameters, and structural parameters on dynamic tracking is methodically compared and analyzed within both pure flow field and thermo-fluid-solid coupling models. The observations reveal that the disturbance values for liquid film seals computed under the thermo-fluid-solid coupling model are slightly less compared to those in the pure flow field model. Increasing excitation amplitude, spring stiffness, and O-ring damping contributes to heightened disturbance, consequently diminishing dynamic tracking effectiveness. In contrast, decreasing the rotational speed and elevating the medium pressure lead to an augmentation of dynamic characteristic coefficients, thereby enhancing dynamic tracking capabilities. Streamlining the number of grooves bolsters dynamic tracking, and with a fixed groove count, adopting structural parameters featuring a groove depth of 17μm, a groove dam ratio of 0.8, and a helix angle of 22° yields optimal dynamic tracking performance.
关键词
液膜密封 /
振动特性 /
小扰动法 /
热流固耦合
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Key words
liquid film seal /
vibration characteristics /
small disturbance method /
thermal-fluid-solid coupling
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