篦齿封严泄漏特性的实验

胡东旭; 贾力; 杨立新

doi:10.13224/j.cnki.jasp.2014.03.010

篦齿封严泄漏特性的实验

doi: 10.13224/j.cnki.jasp.2014.03.010

北京交通大学机械与电子控制工程学院热能工程研究所,北京 100044

基金项目:

国家自然科学基金（51176008）；国家科技部支撑计划（2012BAB12B02）

详细信息

作者简介:
胡东旭（1987-），男，河北秦皇岛人，硕士生，主要从事微细流动与篦齿封严研究.

通讯作者:
贾力（1963-），男，河北石家庄人，教授、博士生导师，博士，主要研究方向为微通道流动与传热. E-mial：ljia@bjtu.edu.cn

中图分类号: V231.3
计量
- 文章访问数: 1412
- HTML浏览量: 1
- PDF量: 947
- 被引次数: 0
出版历程
- 收稿日期: 2013-01-04
- 刊出日期: 2014-03-28

Experiment on leakage characteristics in labyrinth seal

Thermal Engineering Institute, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China

摘要

摘要: 为了研究工程实际尺寸下篦齿封严泄漏特性，设计并搭建了篦齿封严实验台.在进出口压比为1.1~2.0的条件下，探究了节流间隙、齿数、齿腔深度和宽度等对篦齿封严泄漏量和密封腔内压力分布的影响.结果表明：泄漏系数随着压比和节流间隙的提高而增加，但压比达到1.6后，增加趋势逐渐变缓；增加齿数能显著提高篦齿的封严性能，但随着齿数变多，效果逐渐减弱；较浅和较宽的齿腔对于提高篦齿的封严性能更有利；进出口压比、节流间隙和齿腔深度对于篦齿腔内压力系数的分布几乎没有影响；篦齿腔内沿程压力不断降低，但在各齿腔内降低的程度逐渐减小；在篦齿封严中，越接近入口的齿腔对密封性能提高的贡献越大，对封严性能的优劣起着决定性作用.
- 篦齿封严 /
- 压比 /
- 封严结构 /
- 泄漏量 /
- 压力分布
Abstract: A labyrinth seal test setup with a data acquisition system was designed and established to investigate the leakage characteristics of a typical straight-through labyrinth seal with engineering size. The effects of sealing clearance, tooth number, cavity depth and cavity width on the leakage rate and chamber pressure distribution were measured at the pressure ratios with range of 1.1-2.0. Result shows that, the leakage coefficient increased with increasing pressure ratio and sealing clearance,but the increasing trend gradually slowed down when the pressure ratio reached 1.6. The leakage rate decreased rapidly as the tooth number increased. But the tooth number's effects on leakage rate decreased gradually with growing tooth number. The shallow and broad cavity was help to decrease the leakage rate. The decrease of the pressure coefficient became slower in the flow direction. The pressure ratio, sealing clearance and cavity depth had little effect on the cavity pressure coefficient distribution. The upstream cavities mode more contributions to reducing the leakage loss and had key effects on the labyrinth seal performance.
- labyrinth seal /
- pressure ratio /
- sealing geometry /
- leakage rate /
- pressure distribution

HTML

参考文献(15)

[1]	Lattime S B,Steinetz B M.Turbine engine clearance control systems:current practices and future directions[J].Journal of Propulsion and Power,2004,20(2):302-311.
[2]	Denecke J,Schramm V,Kim S.Influence of rub-grooves on labyrinth seal leakage[J].Journal of Turbomachinery,2003,125(2):387-393.
[3]	Chupp R E,Hendricks R C,Lattime S B,et al.Sealing in turbo machinery[J].Journal of Propulsion and Power,2006,22(2):313-349.
[4]	Witting S,Dorr K L,Kim S.Scaling effects on leakage losses in labyrinth seals[J].Journal of Engineering for Power,1983,105(2):305-309.
[5]	Kim T S,Cha K S.Comparative analysis of the influence of labyrinth seal configuration on leakage behavior[J].Journal of Mechanical Science and Technology,2009,23(10):2830-2838.
[6]	Ahmed J,Gamal M,John M.Labyrinth seal leakage tests:tooth profile,tooth thickness,and eccentricity effects[J].Journal of Engineering for Gas Turbines and Power,2008,130(1):1-11.
[7]	Willenborg K,Kim S,Wittig S.Effects of Reynolds number and pressure ratio on leakage loss and heat transfer in a stepped labyrinth seal[J].Journal of Turbomachineny,2001,123(4):815-822.
[8]	Schramm V,Willenborg K,Kim S,et al.Influence of a honeycomb facing on the flow through a stepped labyrinth seal[J].Journal of Engineering for Gas Turbines and Power,2002,124(1):140-146.
[9]	El-Gamal H A,Awad T H,Saber E.Leakage from labyrinth seals under stationary and rotating conditions[J].Tribology International,1996,29(4):291-297.
[10]	Rhode D L,Hibbs R.Tooth thickness effect on the performance of gas labyrinth seals[J].Journal of Tribology,1992,114(4):790-795.
[11]	Rhode D L,Morrison G L.Leakage optimization of labyrinth seals using Navier-Stokes code[J].Tribology Transactions,1994,37(1):105-110.
[12]	吴丁毅.直通式篦齿封严特性的实验研究[J].推进技术,1997,18(3):79-81. WU Dingyi.An experimental investigation on seal character of straight-through labyrinth[J].Journal of Propulsion Technology,1997,18(3):79-81.(in Chinese)
[13]	Afzal S,Hassan S M,Sohaib M,et al.Numerical analysis of flow in cavities of labyrinth seals[C]//Proceedings of 9th International Bhurban Conference on Applied Sciences and Technology(IBCAST).Islambad:IEEE,2012:208-212.
[14]	Stocker H L,Cox D M.Aerodynamic performance of conventional and advanced design labyrinth seals with solid-smooth,abradable,and honeycomb lands [R].NASA CR-135307,1977.
[15]	Vermes G.A fluid mechanics approach to the labyrinth seal leakage problem[J].Journal of Engineering for Power,1961,83(2):161-169.