基于系统响应特征的指尖密封泄漏特性分析
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摘要
结合指尖密封动态工作特点,通过研究转速和转子不平衡力与转子跳动之间的关联规律,得到转子的位移激励,构建了指尖密封系统的动态计算模型,依据指尖密封的系统响应特征研究其泄漏间隙的获取办法,进而基于泄漏间隙特征建立了指尖密封动态泄漏量计算方法.针对某型发动机转子进行了动态泄漏量分析,结果表明:在转子每个转动周期内,指尖密封的动态响应跟随转子激励周期性变化,由此产生的动态迟滞泄漏间隙也随时间而周期性变化,迟滞泄漏的大小随着密封上下游压差的增加而增大,随着转子转速的升高先增加后减小;设置一定的装配过盈量能够一定程度地减小迟滞泄漏;指尖密封磨损后迟滞泄漏规律表现出先减小后增加再降低的变化趋势;与国内外试验结果的对比分析初步验证了提出的计算方法,为指尖密封动态性能设计方法研究提供了参考.
The current work obtained the seal rotor displacement excitation through studying the association rules of rotor speed,rotor unbalanced force and rotor runout based on dynamic working characteristics of finger seal.Then,a dynamic computational model of finger seal system was constructed.The leakage clearance computation method was researched according to the dynamic displacement response characteristics from the constructed model.Then the dynamic leakage calculation method was constructed and the leakage analysis work was conducted.The results preliminarily shows that dynamic displacement response changes with the rotor excitation time in every rotation period.The dynamic leakage clearance produced by dynamic displacement response also changes with the rotor excitation time.The results also indicate that leakage numerical size is affected by working conditions,installation conditions and the abrasion degree of finger boots.The method was validated by the computational example of a special engine and the comparison of calculating results and test data in references.The research work can provide valuable reference for dynamic performances design and study of finger seal.
The current work obtained the seal rotor displacement excitation through studying the association rules of rotor speed,rotor unbalanced force and rotor runout based on dynamic working characteristics of finger seal.Then,a dynamic computational model of finger seal system was constructed.The leakage clearance computation method was researched according to the dynamic displacement response characteristics from the constructed model.Then the dynamic leakage calculation method was constructed and the leakage analysis work was conducted.The results preliminarily shows that dynamic displacement response changes with the rotor excitation time in every rotation period.The dynamic leakage clearance produced by dynamic displacement response also changes with the rotor excitation time.The results also indicate that leakage numerical size is affected by working conditions,installation conditions and the abrasion degree of finger boots.The method was validated by the computational example of a special engine and the comparison of calculating results and test data in references.The research work can provide valuable reference for dynamic performances design and study of finger seal.
引文
[1]Prcotor M P,Kumar A,Delgdo I R.High-speed,high-tem-perature finger seal test result[R].Indianapolis,Indiana:38th AIAA/ASME/SAE/ASEE Joint Propulsion Confer-ence&Exhibit,2002.
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[3]Li J,Obi S,Feng Z.The effects of clearance sizes on laby-rinth brush seal leakage performance using a Reynolds-av-eraged Navier-Stokes solver and non-Darcian porous medi-um model[J].Journal of Power and Energy,2009,223(8):953-964.
[4]Braun M J,Plerson H M,Kudriavtsev V V.Finger sealsolid modeling design and some solid/fluid interaction con-siderations[J].Triblogy Transactions,2003,46(4):566-575.
[5]陈国定,徐华,虞烈,等.指尖密封的迟滞特性分析[J].机械工程学报,2003,39(5):121-124.CHEN Guoding,XU Hua,YU Lie,et al.Analysis to thehysteresis to the hystersis of finger seal[J].Chinese Jour-nal of Mechanical Engineering,2003,39(5):121-124.(inChinese).
[6]陈国定,苏华,张永红.指尖密封轴向布局的变尺度结构研究[J].航空动力学报,2003,18(4):488-491.CHEN Guoding,SU Hua,ZHANG Yonghong.Variable-dimension construction in the axial arrangement of fingerseal mechanism[J].Journal of Aerospace Power,2003,18(4):488-491.(in Chinese).
[7]李二圣,陈国定.一种低迟滞低磨损的指尖密封型线构形的研究[J].航空动力学报,2008,23(4):759-764.LI Ersheng,CHEN Guoding.Study on a new shape-curveof finger seal with low-hysteresis and low-wear[J].Journalof Aerospace Power,2008,23(4):759-764.(in Chinese)
[8]Arora G K,Proctor M P,Steinetz B M,et al.Pressure bal-anced,low hysteresis,finger seal test results[R].AIAA-1999-2686,1999.
[9]张延超,陈国定.指尖密封性能的NASH平衡优化[J].西北工业大学学报,2008,26(1):35-40.ZHANG Yanchao,CHEN Guoding.Applying Nash equi-librium theory to achieving better design of finger seal[J].Journal of Northwestern Polytechnical University,2008,26(1):35-40.(in Chinese)
[10]雷艳妮,陈国定.基于动力学模型的指尖密封迟滞特性[J].机械工程学报,2007,43(5):123-126.LEI Yanni,CHEN Guoding.Finger seal's hysteresis char-acteristic based on dynamical model[J].Chinese Journal ofMechanical Engineering,2007,43(5):123-126.(in Chi-nese)
[11]张延超,陈国定,申晓龙.指尖密封性能的模糊Nash平衡优化[J].航空动力学报,2010,25(1):228-233.ZHANG Yanchao,CHEN Guoding,SHEN Xiaolong.Per-formance optimization for finger seal based on fuzzy Nashequilibrium game[J].Journal of Aerospace Power,2010,25(1):228-233.(in Chinese)
[12]顾永泉.流体动密封(下册)[M].北京:石油大学出版社,1990.
[13]郗命麒.航空制造工程手册[M].北京:航空工业出版社,1993.
[14]第三机械工业部第六二八研究所.航空发动机轴承资料汇编(下)[R].江苏无锡:第三机械工业部第六二八研究所,1975.
[15]苏华.指尖密封结构和性能设计分析与试验研究[D].西安:西北工业大学,2006.SU Hua.Structural design,performance analysis and testsof finger seal[D].Xi'an:Northwestern Polytechnical Uni-versity,2006.(in Chinese)
[2]San A L,Baker J,Adolfo D.Rotordynamic force coeffi-cients of a hybrid brush seal:measurements and predic-tions[J].Journal of Engineering for Gas Turbines andPower,2010,132(4):256-262.
[3]Li J,Obi S,Feng Z.The effects of clearance sizes on laby-rinth brush seal leakage performance using a Reynolds-av-eraged Navier-Stokes solver and non-Darcian porous medi-um model[J].Journal of Power and Energy,2009,223(8):953-964.
[4]Braun M J,Plerson H M,Kudriavtsev V V.Finger sealsolid modeling design and some solid/fluid interaction con-siderations[J].Triblogy Transactions,2003,46(4):566-575.
[5]陈国定,徐华,虞烈,等.指尖密封的迟滞特性分析[J].机械工程学报,2003,39(5):121-124.CHEN Guoding,XU Hua,YU Lie,et al.Analysis to thehysteresis to the hystersis of finger seal[J].Chinese Jour-nal of Mechanical Engineering,2003,39(5):121-124.(inChinese).
[6]陈国定,苏华,张永红.指尖密封轴向布局的变尺度结构研究[J].航空动力学报,2003,18(4):488-491.CHEN Guoding,SU Hua,ZHANG Yonghong.Variable-dimension construction in the axial arrangement of fingerseal mechanism[J].Journal of Aerospace Power,2003,18(4):488-491.(in Chinese).
[7]李二圣,陈国定.一种低迟滞低磨损的指尖密封型线构形的研究[J].航空动力学报,2008,23(4):759-764.LI Ersheng,CHEN Guoding.Study on a new shape-curveof finger seal with low-hysteresis and low-wear[J].Journalof Aerospace Power,2008,23(4):759-764.(in Chinese)
[8]Arora G K,Proctor M P,Steinetz B M,et al.Pressure bal-anced,low hysteresis,finger seal test results[R].AIAA-1999-2686,1999.
[9]张延超,陈国定.指尖密封性能的NASH平衡优化[J].西北工业大学学报,2008,26(1):35-40.ZHANG Yanchao,CHEN Guoding.Applying Nash equi-librium theory to achieving better design of finger seal[J].Journal of Northwestern Polytechnical University,2008,26(1):35-40.(in Chinese)
[10]雷艳妮,陈国定.基于动力学模型的指尖密封迟滞特性[J].机械工程学报,2007,43(5):123-126.LEI Yanni,CHEN Guoding.Finger seal's hysteresis char-acteristic based on dynamical model[J].Chinese Journal ofMechanical Engineering,2007,43(5):123-126.(in Chi-nese)
[11]张延超,陈国定,申晓龙.指尖密封性能的模糊Nash平衡优化[J].航空动力学报,2010,25(1):228-233.ZHANG Yanchao,CHEN Guoding,SHEN Xiaolong.Per-formance optimization for finger seal based on fuzzy Nashequilibrium game[J].Journal of Aerospace Power,2010,25(1):228-233.(in Chinese)
[12]顾永泉.流体动密封(下册)[M].北京:石油大学出版社,1990.
[13]郗命麒.航空制造工程手册[M].北京:航空工业出版社,1993.
[14]第三机械工业部第六二八研究所.航空发动机轴承资料汇编(下)[R].江苏无锡:第三机械工业部第六二八研究所,1975.
[15]苏华.指尖密封结构和性能设计分析与试验研究[D].西安:西北工业大学,2006.SU Hua.Structural design,performance analysis and testsof finger seal[D].Xi'an:Northwestern Polytechnical Uni-versity,2006.(in Chinese)