典型阶梯篦齿高转速密封性能试验

王鹏飞; 郭文; 张靖周

doi:10.13224/j.cnki.jasp.2017.12.031

典型阶梯篦齿高转速密封性能试验

doi: 10.13224/j.cnki.jasp.2017.12.031

1.
南京航空航天大学能源与动力学院，南京210016；中国航空发动机集团有限公司四川燃气涡轮研究院，成都 610500
2.
中国航空发动机集团有限公司四川燃气涡轮研究院，成都 610500
3.
南京航空航天大学能源与动力学院，南京210016

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出版历程
- 收稿日期: 2016-05-07
- 刊出日期: 2017-12-28

Experiment on seal characteristics of high ratational speed of stepped labyrinth seals

摘要

摘要: 在高转速密封试验设备上，进行了实际尺寸阶梯篦齿压比(1.05～28)、相对密封间隙(齿尖密封间隙和齿宽比)(24～40)、泄漏流雷诺数(1900～28000)及旋转速度(0～12000r/min)等对密封性能影响的试验。结果显示：篦齿流量系数随压比变大而上升，随相对密封间隙变大而降低；转速低于5000r/min时，旋转对篦齿流量系数影响不明显，高转速、小压比时，篦齿流量系数随转速的升高而降低，降幅超过301%；较小雷诺数下，篦齿流量系数随雷诺数的减小快速降低，雷诺数超过6000以后，篦齿流量系数受雷诺数的影响不明显；气流通过阶梯篦齿第一道齿的压力损失最小，通过最后一道齿的压力损失最大，通过中间各齿的压力损失相当。基于试验测试数据，修正了典型阶梯篦齿流量系数的求解关系式，修正后的关系式计算值与实测值吻合良好。
- 空气系统 /
- 篦齿 /
- 密封性能 /
- 流量系数 /
- 压力分布
Abstract: Experiments were carried out to investigate the seal characteristics of real size models of a typical steppedlabyrinth seal. Flow coefficients of the labyrinth seal were obtained in a high speed experiment facility at different pressure ratios (105－28), relative sealing clearances (24－40), Reynolds numbers(1900－28000) and rotational speeds (0－12000r/min).Results indicated that the flow coefficient of labyrinth seal rose with the increase of pressure ratio, and decreased with a higher relative sealing clearance. No noticeable change of flow coefficient was found when the labyrinth seal ran under a rotational speed of 5000r/min. However, under high rotational speed and low pressure ratio conditions, the flow coefficient declined more than 301% as the operating speed went up. Moreover, under the conditions with lower Reynolds numbers, a rapid drop of flow coefficient was found with the decreasing Reynolds numbers. When the Reynolds numbers were larger than 6000, no clear effect on flow coefficients can be observed. Axial pressure distribution measurements showed that pressure drop reached its minimum and maximum values when air flowed through the first and the last seal tooth respectively, the pressure dropped through the remaining teeth were almost uniform. According to the findings, an empirical expression to evaluate flow coefficients of steppedlabyrinth seals was also obtained, and agreed with the experimental results perfectly.
- air system /
- labyrinth /
- seal characteristics /
- flow coefficients /
- pressure distribution

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