柱面螺旋槽干气密封流动场数值计算与试验验证

针对柱面螺旋槽干气密封中的单列螺旋槽结构特点,建立螺旋槽浮环气膜密封的数学分析模型。基于中心差分法和Newton-Raphson迭代法,进行压力控制雷诺方程和气膜厚度方程的求解,得到压力和气膜厚度分布及不同操作参数下柱面单列螺旋槽气膜的泄漏量,并分析工况参数对柱面螺旋槽稳态性能的影响。结果表明:泄漏量是随着偏心率和压力的增加而升高;当偏心率一定时,转速的增加,导致泄漏量下降;当转速一定时,压力的上升导致泄漏量的急剧上升,近乎线性分布。试验结果与理论分析结果相吻合,验证了理论模型和计算方法的正确性。

Microscale Calculation and Experiment of Flow Field of Dry Gas Seal with Cylindrical Spiral Groove

According to the structure characteristics of single row spiral groove in cylindrical spiral groove dry gas seal,the mathematical analysis model of spiral groove floating ring gas film seal was established.Based on the central difference method and Newton Raphson iteration method,the pressure controlled Reynolds equation and the film thickness equation were solved.The distribution of pressure and gas film thickness and the leakage of the single row spiral groove film under different operating parameters were obtained.The influence of operating parameters on the steady state performance of the spiral groove was discussed.The results show that the leakage is increased with the increase of eccentricity and pressure.When the eccentricity is fixed,the increase of rotating speed leads to the decrease of leakage.When the rotating speed is fixed,the increase of pressure leads to the sharp increase of leakage,which is almost linear distribution.The experimental results are consistent with the theoretical analysis results,which verifies the correctness of the theoretical model and calculation method