迷宫密封泄漏特性影响因素的研究

李志刚; 李军; 丰镇平

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迷宫密封泄漏特性影响因素的研究

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- 迷宫密封泄漏特性影响因素的研究
- Effects of Gap Pressure Ratio and Rotational Speed on Discharge Behavior of Labyrinth Seal
- 西安交通大学学报 2010年44卷第3期页码：16-20
- 作者机构：
  
  西安交通大学叶轮机械研究所,西安,710049
- 作者简介：
- 基金信息：
  
  : 2009-08-08. 作者简介: 李志刚(1986-),男,硕士生;李军(联系人),男,教授. 基金项目: 国家“973”计划资助项目(2007CB707705);新世纪优秀人才支持计划资助项目(NCET-07-0699)
- DOI：
  中图分类号： TK262
- 网络首发：2010-03-10，
  
  纸质出版：2010
- 稿件说明：
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李志刚, 李军, 丰镇平. 迷宫密封泄漏特性影响因素的研究[J]. 西安交通大学学报, 2010,44(3):16-20.

Effects of Gap Pressure Ratio and Rotational Speed on Discharge Behavior of Labyrinth Seal[J]. 2010, 44(3): 16-20.
李志刚, 李军, 丰镇平. 迷宫密封泄漏特性影响因素的研究[J]. 西安交通大学学报, 2010,44(3):16-20. DOI：

Effects of Gap Pressure Ratio and Rotational Speed on Discharge Behavior of Labyrinth Seal[J]. 2010, 44(3): 16-20. DOI：

摘要

采用标准k-ε紊流模型和三维RANS方程求解方法

数值研究了密封间隙、压比、转速对典型迷宫密封泄漏特性的影响规律.计算分析了典型迷宫密封在3种密封间隙、4种压比和4种转速下的泄漏特性.研究结果表明:用相对流量系数(转动时的流量系数与静止时的流量系数的比值)与速比(周向速度与轴向通流速度的比值)的函数关系表征泄漏量随转速变化的规律时

存在一个临界速比约等于1.0; 低于这个临界速比时

转速对泄漏量的影响不明显; 高于这个临界速比时

泄漏量随转速的增大而减小

在很高的转速下(6 000 r/min以上)

泄漏量至少减小了5.1%; 相同间隙下

泄漏系数随着压比的提高而近似线性增加; 相同转速下

随着密封间隙的减小

相对泄漏量逐渐降低.

Abstract

The effects of sealing clearance

pressure ratio and rotational speed on the discharge behavior of a typical labyrinth seal are numerically investigated. The Reynolds-averaged Navier-Stokes equations and the standard k-ε turbulent model are adopted to obtain the leakage flow characteristics of the labyrinth seal under the conditions of three sealing gaps

four pressure ratios and four rotational speeds. The relative leakage flow coefficient C

and velocity ratio U/C

are employed to analyze the effects of the rotational speed on the discharge behavior. C

is defined as the ratio of leakage rate at rotation to the leakage rate at rest. U/C

denotes the ratio of the circumferential velocity to the axial flow velocity. Numerical simulation results show that there exists a critical velocity

ratio of 1.0. The effect of the rotational speed on the relative leakage flow coefficient can be ignored when the velocity ratio is less than 1.0. If the velocity ratio is greater than 1.0

the relative leakage flow coefficient decreases with the increase of the rotational speed

and the leakage flow rate of the labyrinth seal at the high rotational speed of more than 6 000 r/min decreases by 5.1%. The leakage coefficient increases linearly with pressure ratio at the fixed sealing clearance. In addition

the leakage coefficient decreases with the decrease of gap width at the same rotational speed.

关键词

Keywords

references

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