静压干气密封端面流场数值模拟  

Numerical simulation on flow field of aerostatic dry gas seal

作　　者：王和顺[1] 董霖[1] 黄泽沛[2] 张车宁 陈次昌[3] 

机构地区：[1]西华大学机械工程与自动化学院,四川成都610039 [2]四川日机密封件股份有限公司,四川成都610046 [3]西南石油大学机电工程学院,四川成都610500

出　　处：《排灌机械工程学报》2011年第2期165-169,共5页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51005188);西华大学机械电子工程四川省重点学科经费资助项目(SZJJ2009-023);西华大学人才培养项目(R0720221)

摘　　要：为了提高静压干气密封的性能,基于N-S方程、层流模型、SIMPLEC算法,在节流孔直径和端面间隙变化的情况下,对静压干气密封流场进行数值模拟,重点考察了端面气膜压力及开启力的变化情况.数值结果表明:密封气在流经节流孔后形成显著的压力降,该压力降的大小会随端面间隙增大而增大,随节流孔径增大而减小.端面压力在均压浅槽区中心附近最高,向四周逐渐下降,在均压浅槽区边沿附近,压力梯度较大.开启力总体随间隙增大而减小,极小值接近于0.当端面间隙在5～12μm范围内,开启力随间隙增大而迅速减小,端面气膜具有很大的刚度.较小的节流孔直径可在小端面间隙条件下获得更大的气膜刚度.根据计算数据,对某轴径为30mm的反应釜搅拌器轴端密封,在转速为50～300 r/min范围内成功进行了台架实验,重点对泄漏量和端面磨损状况进行了监测,结果表明密封实现了稳定的非接触式运转.In order to improve the performance of an aerostatic dry gas seal,the flow field numerical simulation was carried out based on the N-S equation,laminar flow model and SIMPLEC algorithm with different throttle diameters and face clearances.The gas film pressure distributes and force changes were analyzed especially.The results show that significant pressure drop formed after the gas flows through orifice,and the drop value increases with clearance increases,decreases with orifice diameter increases.The highest-pressure appears at the center of shallow groove,and is gradually declining to around.Bigger pressure gradient appears in the shallow groove near the edge area.The opening force general decreases with clearance,minimum value is close to zero.When the face clearance is in the range of 5～12 μm,the opening force increases rapidly with clearance decreasing,therefore larger gas film stiffness is formed.According to calculations,smaller orifice diameter is helpful to get larger gas film stiffness under the conditions of less face clearance.Both hydrostatic and hydrodynamic test were carried out,the diameter of the seal tested was 30 mm and the test speed is of 50～300 r/min.The leakage and wear were monitored and the results show that the sealing achieved stable non-contacting operation.

关 键 词：密封 静压干气密封 端面流场 压力降 数值模拟 

分 类 号：S277.9[农业科学—农业水土工程] TH136[农业科学—农业工程]