Show simple item record

contributor authorZhang, Min
contributor authorChilds, Dara W.
contributor authorTran, Dung L.
contributor authorShresth, Hari
date accessioned2022-02-04T22:01:42Z
date available2022-02-04T22:01:42Z
date copyright10/28/2020 12:00:00 AM
date issued2020
identifier issn0742-4795
identifier othergtp_142_11_111012.pdf
identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4274734
description abstractThe labyrinth seal is one of the most popular noncontact annular seals used in centrifugal compressors to improve machine efficiency by reducing the secondary flow leakage. Reducing the radial clearance Cr can effectively decrease the seal's leakage and therefore increase the machine efficiency. However, reducing Cr can also introduce undesired effects on the machine's vibration behaviors. This paper experimentally studies the impact of reducing Cr on the leakage and rotordynamic coefficients of a 16-tooth see-through labyrinth seal under wet-gas conditions. The test seal's inner diameter is 89.256 mm. Two rotors with different diameters are used to obtain two radial clearances (0.102 mm and 0.178 mm). Tests are carried out at a supply pressure of 62 bars, three speeds from 10 krpm to 20 krpm, three pressure ratios from 0.21 to 0.46, and six inlet liquid volume fractions (LVFs) from zero to 15%. The test fluid is a mixture comprised of air and silicon oil. Test results show that, for all pure-air and mainly air conditions, decreasing Cr decreases (as expected) the test seal's leakage mass flowrate. For all test cases, direct dynamic stiffness KΩ is negative, producing a negative centering force on the associated rotor. For inlet LVF ≤ 8%, the effects of decreasing Cr on KΩ are negligible. When inlet LVF = 12% and 15%, decreasing Cr increases KΩ (decreases the magnitude). In other words, when inlet LVF = 12% and 15%, decreasing Cr reduces the test seal's negative centering force on the rotor, and would increase the critical speeds of the rotor. The value of the effective damping Ceff near 0.5ω represents the seal's capability to suppress the rotor's potential whirling motion at about 0.5ω. For all pure-air and mainly air conditions, decreasing Cr generally increases the Ceff value near 0.5ω; i.e., decreasing Cr improves the test seal's stabilizing capability against the rotor's potential whirling motion at about 0.5ω.
publisherThe American Society of Mechanical Engineers (ASME)
titleEffects of Clearance on the Performance of a Labyrinth Seal Under Wet-Gas Conditions
typeJournal Paper
journal volume142
journal issue11
journal titleJournal of Engineering for Gas Turbines and Power
identifier doi10.1115/1.4048797
journal fristpage0111012-1
journal lastpage0111012-8
page8
treeJournal of Engineering for Gas Turbines and Power:;2020:;volume( 142 ):;issue: 011
contenttypeFulltext


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record