首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part J. Journal of engineering tribology >The performance of spiral groove dry gas seal under choked flow condition considering the real gas effect
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The performance of spiral groove dry gas seal under choked flow condition considering the real gas effect

机译:考虑实际煤气效应的窒息流动状态下螺旋槽干气密封的性能

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摘要

By taking carbon dioxide and hydrogen as lubricating gas, respectively, this paper presents an analysis on the pressure characteristics and temperature distribution of spiral groove dry gas seal which influenced by real gas effect under choked flow condition. Numerical results show that the deviation between real gas and ideal gas, which expressed by the deviation degree between compressibility factor Z and 1, is the main reason for real gas effect affecting sealing performance. Compared with ideal gas model, real gas effect raises exit pressure, opening force, leakage rate, Mach number in dam region, and temperature for carbon dioxide (Z < 1), while it decreases those characteristics for hydrogen (Z > 1) under the same operating conditions. In addition, choked flow effect increases opening force and reduces leakage rate and temperature-drop between entrance and exit of sealing clearance. Meanwhile, it may cause an unstable behavior for the seal.
机译:通过将二氧化碳和氢作为润滑气体取出,本文提出了螺旋槽干气密封的压力特性和温度分布的分析,其受到窒息流动条件下的实际气体效应的影响。 数值结果表明,真实气体和理想气体之间的偏差,其表示可压缩因子Z和1之间的偏差程度,是影响密封性能的真实气体效果的主要原因。 与理想气体模型相比,实际煤气效果提高了坝区的出口压力,打开力,泄漏率,马赫数,以及二氧化碳(Z <1)的温度,同时降低了氢气(Z> 1)的特征 相同的操作条件。 此外,Choked流动效果增加了开启力并降低了密封间隙入口和出口之间的泄漏率和温度下降。 同时,它可能导致密封的不稳定行为。

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