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Three-Dimensional Flow-Heat Coupling Model of a Wavy-Tilt-Dam Mechanical Seal

机译：波浪式斜坝机械密封的三维流热耦合模型

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摘要

A three-dimensional flow-heat coupling model of a wavy-tilt-dam (WTD) mechanical seal is established to study the heat transfer in both the fluid and the solid domains. The upwind scheme is used to ensure the convergence of the numerical calculation. The inlet temperature boundary condition is discussed and two modified inlet boundary condition methods are proposed to eliminate the noncontinuity of the film inlet temperature. The method where the temperature gradient in the radial direction is assumed constant gives more reasonable results than the method where the temperature is assumed to vary linearly along the film thickness direction. The results show that the highest temperature is located near the inlet due to the waves, which will cause a backflow along the converging spaces formed between the rotor and seal faces (convex segments of the wave) in the circumferential direction. The thermal deformation in the radial direction is larger than the deformation that is caused by waves in the circumferential direction. In addition the deformation will increase the taper, which will result in an increase in the minimum film thickness. A parametric study shows that the maximum temperature of the film will decrease as the wave number increases. The rotor speed and pressure difference will obviously affect the performance of the WTD seal.
机译：建立了波浪式水坝（WTD）机械密封的三维流-热耦合模型，以研究流体和固体域中的热传递。上风方案用于确保数值计算的收敛性。讨论了入口温度边界条件，并提出了两种改进的入口边界条件方法，以消除薄膜入口温度的不连续性。与假定温度沿膜厚度方向线性变化的方法相比，假定径向温度梯度恒定的方法可提供更合理的结果。结果表明，由于波浪的缘故，最高温度位于入口附近，这将导致沿转子和密封面（波浪的凸段）之间形成的会聚空间沿周向回流。沿径向的热变形大于由沿周向的波引起的变形。另外，变形将增加锥度，这将导致最小膜厚度的增加。参数研究表明，膜的最高温度将随着波数的增加而降低。转子速度和压力差将明显影响WTD密封件的性能。

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