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Abstract: Presented
are the test results of sealing performance of three types of honeycomb
seals, which work under various pressure ratio and rotor speeds. The
depth of the honeycomb seal hole is 3.0 mm in all three types of seal.
The cell size (the distance between the opposite sides of the hexagonal
honeycomb) of the honeycomb seals is respectively 3.2 mm, 1.6 mm and 0.8
mm. The test results show that among the three types of honeycomb seal,
the honeycomb seal with a cell size of 1.6 mm enjoys the best sealing
performance. This means that the effect exercised by the size of a
honeycomb seal cell on the leakage flow does not exhibit a linear
relationship. The numerical simulation results indicate that the leakage
of honeycomb seals would be at a smaller level due to the stronger
turbulent flow and the formation of stronger vortex in the honeycomb
cavity，which leads to a better effect of dissipation of the air energy,
when the ratio of the cell width to the cell depth is moderate. When the
ratio of the cell width to the cell depth is bigger or smaller, the
honeycomb seals’ leakage would be at a higher level due to the weaker
turbulent flow and the formation of weaker vortex in the honeycomb
cavity that leads to a poor effect of dissipation of the air energy.
Key words:Honeycomb
seal Leakage test Numerical simulation
CLC No: TH45
国家自然科学基金(50375013)和北京化工大学青年教师科研基金(QN0240)资助项目.
Received 20030422, received in revised form 20030730
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