| 摘要: |
| 螺旋槽对柱面气膜密封静力和动力特性有较大影响。应用非定常动网格技术建立了柱面气膜密封多频椭圆涡动静力与动力特性求解模型，分析了不同工况及结构参数下螺旋槽对柱面气膜密封静力与动力特性的影响，研究了螺旋槽对封严气体泵吸效应与流体动压效应影响，揭示了螺旋槽对柱面气膜密封静力和动力特性的影响机理。研究结果表明：随着进出口压比与偏心率的增大，气膜内流体动压效应增强，封严气体压力分布不均匀，使得密封泄漏量增加。随着螺旋角的增大，气体经过螺旋槽泵吸效应与挤压作用聚集在螺旋槽根部，形成了较为明显的动压效应，使得泄漏量增加。当螺旋角为30°~50°时，密封的径向气流力指向转子涡动中心，切向气流力与转子涡动速度方向相反，有效地抑制了转子涡动，转子系统稳定性较好。 |
| 关键词: 螺旋槽 柱面气膜密封 转子多频涡动 静力特性 动力特性 流体动压效应 |
| DOI：10.13675/j.cnki.tjjs.210771 |
| 分类号:V233.5 |
| 基金项目:国家自然科学基金（52075346）；辽宁省航发材料摩擦学重点实验室开放基金（LKLAMTF202103）；先进航空动力创新工作站（依托中国航空发动机研究院设立）项目（HKC2020-02-030）。 |
|
| Influence Mechanism of Spiral Groove on Static and Dynamic Characteristics of Cylinder Gas Film Seal |
|
ZHANG Ran1, ZHAO Huan1, SUN Dan1, HU Hai-tao2, CHANG Cheng2
|
|
1.Key Laboratory of Advanced Measurement and Test Technique for Aviation Propulsion System，Liaoning Province， School of Aero-Engine，Shenyang Aerospace University，Shenyang 110136，China;2.AECC Sichuan Gas Turbine Establishment，Chengdu 610500，China
|
| Abstract: |
| The spiral groove has a great influence on the static and dynamic characteristics of the cylinder gas film seal. The unsteady dynamic grid technology is used to establish the solution model of the dynamic and static characteristics of multi-frequency elliptic vortex of cylindrical gas film seal. The effects of spiral groove on the static and dynamic characteristics of cylindrical gas film seal under different working conditions and structural parameters are analyzed， and the effects of spiral groove on the suction effect of sealing gas pump and fluid dynamic pressure effect are studied. The influence mechanism of spiral groove on static and dynamic characteristics of cylindrical gas film seal is revealed. The results show that with the increase of inlet and outlet pressure ratio and eccentricity， the fluid dynamic pressure effect in the gas film is enhanced， and the sealing gas pressure distribution is not uniform， which leads to the increase of sealing leakage. With the increase of helical angle， the gas accumulates at the root of the helical groove through the pumping effect and extrusion effect， forming a relatively obvious dynamic pressure effect， which increases the leakage amount. When the spiral angle is 30°~50°， the sealed radial airflow force points to the rotor vortex center， and the tangential airflow force is opposite to the rotor vortex velocity， which effectively inhibits the rotor vortex， and the rotor system has good stability. |
| Key words: Spiral groove Cylinder gas film seal Rotor multi-frequency vortex Static characteristics Dynamic characteristics Hydrodynamic pressure effect |
