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首页> 外文会议>ASME(American Society of Mechanical Engineers) Turbo Expo vol.4 pt.B; 20070514-17; Montreal(CA) >LABYRINTH SEAL LEAKAGE TESTS: TOOTH PROFILE, TOOTH THICKNESS, AND ECCENTRICITY EFFECTS
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LABYRINTH SEAL LEAKAGE TESTS: TOOTH PROFILE, TOOTH THICKNESS, AND ECCENTRICITY EFFECTS

机译：拉比林斯密封测试：牙齿轮廓，牙齿厚度和偏心效应

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摘要

The effects of two seal design parameters, namely blade (tooth) thickness and blade profile, on labyrinth seal leakage, as well as the effect of operating a seal in an off-center position, were examined through a series of non-rotating tests. Two reconfigurable seal designs were used, which enabled testing of two- four-, and six-bladed see-through labyrinth seals with different geometries using the same sets of seal blades. Leakage and cavity pressure measurements were made on each of twenty-three seal configurations with a four inch (101.6 mm) diameter journal. Tests were carried out with air as the working fluid at supply pressures of up to 100 psi-a (6.89 bar-a).Experimental results showed that doubling the thickness of the labyrinth blades significantly influenced leakage, reducing the flow-rate through the seals by up to 20%. Tests to determine the effect of blade-tip profile produced more equivocal results, with the results of experiments using each of the two test seal designs contradicting each other. Tests on one set of hardware indicated that beveling blades on the downstream side was most effective in limiting leakage whereas tests on newer hardware with tighter clearances indicated that seals with flat-tipped blades were superior. The test results illustrated that both blade profile and blade thickness could be manipulated so as to reduce seal leakage. However, an examination of the effects of both factors together indicated that the influence of one of these parameters can, to some extent, negate the influence of the other (especially in cases with tighter clearances). Lastly, for all configurations tested, results showed that leakage through a seal increases with increased eccentricity and that this phenomenon was considerably more pronounced at lower supply pressures.
机译：通过一系列非旋转测试，检查了两个密封设计参数，即叶片（齿）厚度和叶片轮廓，对迷宫式密封泄漏的影响，以及在偏心位置操作密封的影响。使用了两种可重新配置的密封设计，可以使用相同的密封叶片组对具有不同几何形状的两，四，六叶片透明迷宫式密封进行测试。对二十三种密封构造中的每一种进行了泄漏和空腔压力测量，密封构造的直径为4英寸（101.6毫米）。在供应压力高达100 psi-a（6.89 bar-a）的情况下，以空气作为工作流体进行了试验，实验结果表明，将迷宫式叶片的厚度加倍会严重影响泄漏，从而降低了通过密封件的流量最多增加20％确定叶尖轮廓效果的测试产生了更多模棱两可的结果，使用两种测试密封件设计的实验结果相互矛盾。在一组硬件上进行的测试表明，下游侧的斜角刀片在限制泄漏方面最有效，而在间隙较紧的新型硬件上的测试表明，平头刀片的密封性能更佳。测试结果表明，叶片轮廓和叶片厚度均可操纵，以减少密封件泄漏。但是，同时检查这两个因素的影响表明，这些参数之一的影响可以在某种程度上抵消另一个参数的影响（尤其是在间隙较小的情况下）。最后，对于所有测试的配置，结果表明，通过密封件的泄漏会随着偏心率的增加而增加，并且这种现象在较低的供油压力下更加明显。

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