干气密封密封环温度场的数值分析

干气密封的密封环温度分布是分析其热变形的基础。本文建立了A型干气密封动、静环和密封间隙流场的三维计算模型，在ANSYS 的Workbench平台采用热–流耦合方法求解动、静环三维稳态热传导方程，得到其温度场。数值模拟结果表明：气膜粘性剪切热是干气密封系统的主要热源；在给定工况、给定密封结构中，83.3%的气膜粘性剪切热通过密封端面传递给动环，只有9.7%传递给静环，剩余7.0%的热量由泄漏介质带走；动环平均温度略高于静环；动、静环端面温度最高，背面温度较低；在端面上温度也不是均匀的，在螺旋槽根部至密封泄漏出口段温度达到最高。研究结果为干气密封动、静环变形研究、选材和结构设计理论的完善提供了一定的参考依据。

Numerical Analysis of Temperature Field on the Sealing Rings of a Dry Gas Seal

The temperature fields of the sealing rings of a dry gas seal are the basis for analyzing face distortions. Three-dimensional models of the rotating ring, the stationary ring, and the clearance gap of type-A dry gas seal with a spiral grooved face were built. A three-dimensional steady-state heat conduction equation for the sealing rings was solved using ANSYS Workbench and the temperature fields of sealing rings were obtained. The results show that viscous shear heat of the gas film is the main heat source of the dry gas seal system. 84% of viscous shear heat is transferred to the rotating ring through the seal end face. Only 9.7% of the heat is transferred to the stationary ring. And the remaining is carried away by the leakage gas. The average temperature of the rotating ring is slightly higher than that of the stationary ring. The temperature of the end face for each seal ring is higher than that of the back of the ring. The temperature of the end face for each ring is not uniform and achieves the highest near the root of a spiral groove. These results provide the basis for the improvement of theory on the research of the face distortions of the rotor and the stator of a dry gas seal, the selection of their materials, and design of their structures.