沟槽环形密封的润滑膜摩擦模型

IF 1.3 Q2 ENGINEERING, AEROSPACE
Robin M. Robrecht, Peter F. Pelz
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引用次数: 0

摘要

槽状液体环密封对涡轮机械的设计有重要的影响。相应的润滑膜模型需要考虑沟槽与滑动密封的不同摩擦行为。然而,目前还缺乏可靠且经过验证的模型。为此,探讨了摩擦系数模型的适用性,并提出了一种标定方法。通过96次稳态RANS模拟,研究了不同工况和不同槽形的单方槽。结果用于校准摩擦模型,并成功地验证了它在槽上的压降。为了验证这一点,对两种方形槽较大的全槽密封进行了实验研究。将摩擦模型整合到润滑模型中,并与指定泄漏量和偏心距下的压力差和产生的力的测量数据进行比较。模型对压差的预测可以认为是很好的。力预测显示出明显的偏差,但考虑到力的大小和测量的不确定性,可以认为是可以接受的。结果表明,本文的摩擦模型方法、假设和标定方法具有普遍的有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Lubrication Film Friction Model for Grooved Annular Seals
Grooved liquid annular seals have a significant influence on the design of turbomachines. Corresponding lubrication film models need to account for the different friction behavior of the grooves compared to plain seals. However, there is a lack of reliable and validated models for this purpose. Thus, the applicability of a friction factor model is explored and a calibration method is presented. A single square groove is investigated by means of 96 steady-state RANS simulations for different operation conditions and groove geometries. The results are used to calibrate the friction model and successfully verify it in terms of the pressure drop over the groove. For validation, two full grooved seals with relatively large square grooves were investigated by experiment. The friction model was incorporated in a lubrication model and compared to the measurement data for the pressure difference and the resulting force for specified leakage and eccentricity. The model predictions for the pressure difference can be considered very good. The force predictions show significant deviation, but can be considered acceptable given the low force magnitudes and measurement uncertainty. The results offer a general validity to our friction model approach, assumptions and the calibration method.
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来源期刊
CiteScore
2.30
自引率
21.40%
发文量
29
审稿时长
11 weeks
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