螺旋槽端面密封脱开转速的理论及试验

›› 2008, Vol. 44 ›› Issue (8): 55-60.

螺旋槽端面密封脱开转速的理论及试验

张国渊;袁小阳;赵伟刚;李治国;杨绍康

西安交通大学现代设计及转子轴承系统教育部重点试验室;中国航天科工集团第六研究院11所

发布日期:2008-08-15

Theoretical and Experimental Approach of Separation Speed of Spiral Groove Face Seals

ZHANG Guoyuan;YUAN Xiaoyang;ZHAO Weigang;LI Zhiguo;YANG Shaokang

Key Laboratory of Ministry of Education for Modern Design and Rotor-Bearing System, Xi’an Jiaotong University The 11th Institute of the Sixth Academy, China Aerospace Science & Industry Corporation

Published:2008-08-15

摘要/Abstract

摘要： 提出螺旋槽端面密封脱开转速的理论分析模型，并建立适合于密封端面脱开后的内外双槽结构的非接触式端面密封数学模型。理论研究一种外螺旋槽和内人字槽组合的双螺旋槽端面密封的临界脱开转速，同时讨论该类非接触端面密封开启力、流量、摩擦力矩等随转速和密封间隙的变化规律。试验得到了直径100 mm、槽深3 μm的组合螺旋槽(外螺旋槽和内人字槽组合)端面密封在水介质(27 ℃)工况下的临界脱开转速，并将其与理论结果进行对比研究。研究结果表明，当密封转速超过约9 kr/min后，密封处在非接触状态，此时的密封泄漏量仅为1.2 mL/s。试验得到的端面密封脱开转速与理论结果一致(误差小于10%)，从而有效地证实了端面脱开转速可作为对密封端面接触与否的判定依据。当密封转速高于脱开转速后，密封处在非接触状态，其工作寿命较长，泄漏量较小，这对于可重复使用火箭发动机涡轮泵端面密封的研制具有重要理论和试验参考价值。

关键词: 理论及试验, 螺旋槽端面密封, 脱开转速

Abstract: The theoretical and analytical model of separation speed of spiral groove face seal is introduced. A mathematical model of non-contacting double narrow spiral grooved seals is presented. The separation speed of double narrow groove face seal with outer spiral grooves and inner herringbone grooves is obtained. The influences of rotation speed and film thickness on the basic static cha- racteristics (opening force, leakage, friction torque and power loss) of non-contacting double narrow spiral grooved seals are discussed. Comparisons are presented between the measures and predications of an important parameter (separation speed) for a 100 mm diameter, narrow spiral groove (3 μm) face seal using water (27 ℃) as a test fluid. The results show that the non-contacting seal is formed at about 9 kr/min, and its leakage is about 1.2 mL/s. The relative errors between the measured and the predicted separation speed are less than 10%, and the parameter (separation speed) of the face seal is validated. When the rotation speed is higher than separation speed, the face seal is in non-contacting state, which has the low leakage and the long life. These findings provide the theoretical and experimental references for the design of reused face seal applied in the liquid rocket engine turbopumps.

Key words: Separation speed, Spiral groove face seals, Theoretical and experimental approach

中图分类号:

TH133

张国渊;袁小阳;赵伟刚;李治国;杨绍康. 螺旋槽端面密封脱开转速的理论及试验[J]. , 2008, 44(8): 55-60.

ZHANG Guoyuan;YUAN Xiaoyang;ZHAO Weigang;LI Zhiguo;YANG Shaokang. Theoretical and Experimental Approach of Separation Speed of Spiral Groove Face Seals[J]. , 2008, 44(8): 55-60.