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化工学报  2014 

实际气体对T槽干气密封动态特性的影响

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Keywords: 干气密封,T槽,动态特性,实际气体,数值模拟,二氧化碳

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Abstract:

目前,针对干气密封的研究一般把气体处理为理想气体,但是在高压工况下,气体的实际行为与理想气体有较大差异。采用维里方程表达气体的实际行为,获得实际气体效应修正的气体润滑雷诺方程,利用小扰动法和有限差分法求解该雷诺方程,获得压力分布,进而获得气膜刚度和气膜阻尼等表征干气密封动态特性参数。针对T槽干气密封,以二氧化碳(CO2)、氢气(H2)和氮气(N2)为例,分别分析了实际气体效应对T槽干气密封的气膜刚度和气膜阻尼等动态特性的影响,并与理想气体进行对比,结果表明:随着压缩数Λ的增大,三种实际气体与理想气体的气膜刚度、气膜阻尼均增大。随着频率数σ的增大,实际气体与理想气体的气膜刚度增大,气膜阻尼减小。实际气体气膜刚度、气膜阻尼偏离理想气体气膜刚度、气膜阻尼的程度随着压缩因子Z偏离理想气体(Z=1)的程度增加而增加。对于CO2(Z>1),气膜刚度大于理想气体气膜刚度,而气膜阻尼小于理想气体气膜阻尼。对于H2(Z2(Z≈1)的气膜刚度与气膜阻尼与理想气体近似相等。

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