ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Theoretical and experimental study of leakage characteristics of honeycomb seal
Received date: 2016-06-07
Revised date: 2016-07-17
Online published: 2016-08-03
Supported by
National Natural Science Foundation of China (11302133, 51675351); Natural Foundation of Liaoning Province (2015020113)
The leakage characteristics of the honeycomb seal directly influence the working efficiency of the aero-engine. The leakage characteristics of honeycomb seal are analyzed using theoretical and experimental methods. The CFD model for the flow characteristic of honeycomb seal is developed to analyze the influence of rotational speed, inlet/outlet pressure ratio, subtense distance, cell depth, and wall thickness on seal leakage and to reveal the densification mechanism of honeycomb seal. The seal leakage test rig is designed and built to analyze the influence of the inlet/outlet pressure ratio and the rotational speed on leakage of honeycomb seal. Numerical analysis and experimental tests are conducted to verify each other. Based on the Egli formula for leakage quantity of the traditional classic labyrinth seal, the calculation formula for the leakage quantity of honeycomb seal is constructed, considering the factors influencing the leakage characteristics of honeycomb seal. The results show that the cell depth, subtense distance and wall thickness can influence the development of the vortex system and the density of honeycomb holes, and thereby influence the leakage. The more fully the vortex system develops and the greater the density of honeycomb hole is, the less honeycomb seal leakage will be. The results show that the rotational speed has little influence on the honeycomb seal leakage. The leakage linearly increase with the increasing inlet/outlet pressure ratio. With the increase of the honeycomb cell depth, the honeycomb seal leakage is firstly reduced and is then stabilized. With the increase of the subtense distance, the honeycomb seal leakage decreases initially, and then increases in small particle size range. With the increase of the wall thickness, the honeycomb seal leakage increases linearly initially, and then slowly increases. The results of this study can assist in improving the design of annular seal.
SUN Dan , WANG Mengfei , AI Yanting , XIAO Zhonghui , MENG Jigang , LI Yun . Theoretical and experimental study of leakage characteristics of honeycomb seal[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017 , 38(4) : 420512 -420512 . DOI: 10.7527/S1000-6893.2016.0214
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