高温基线密封编织弹簧管的建模与仿真
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摘要
为了研究高温基线密封中的编织弹簧的回弹特性,参照Pierce线圈模型对编织弹簧管进行参数化建模。采用有限元软件对编织弹簧管进行静力学仿真,对比有限元计算结果与实验数据,接触面摩擦因数为0. 1时仿真结果与实验结果吻合较好。弹簧刚度对线径十分敏感,回弹力与线径呈现非线性高次关系。增加编织线股数,弹簧刚度会成倍增加。温度在低于600℃时对弹簧刚度的影响较小,在高于600℃后,弹簧刚度随着温度升高快速下降。通过S-N曲线计算编织弹簧管在650℃时的最低疲劳寿命高于密封设计要求。研究结果表明,在编织弹簧管的设计要求的前提下,环密度为0. 05、线径为0. 32 mm、双线编织的编织弹簧管具有较好的性能。。
In order to study the springback characteristics of braided spring in high temperature baseline seal,a parametric model of braided spring tube was established by Pierce coil model. The static simulation of braided spring tube was carried out by using finite element software. Compared with the experimental data,the simulation results are in good agreement with the experimental results when the friction coefficient of the contact surface is 0. 1. Spring stiffness is very sensitive to line diameter,and the relationship between spring resilience and line diameter is nonlinear and high-order. Increasing the number of strands of braided yarn will multiply the spring stiffness. The influence of temperature on spring stiffness is small when it is lower than 600 ℃. When it is higher than 600 ℃,spring stiffness decreases rapidly with the increase of temperature. The minimum fatigue life of braided spring tube calculated by S-N curve is higher than that of sealing design at 650 ℃. According to the design requirement of baseline seal,it is recommended to use the parameters of ring density LD=0. 05,line diameter 0. 32 mm and doublewire braiding to make braided spring tube.
In order to study the springback characteristics of braided spring in high temperature baseline seal,a parametric model of braided spring tube was established by Pierce coil model. The static simulation of braided spring tube was carried out by using finite element software. Compared with the experimental data,the simulation results are in good agreement with the experimental results when the friction coefficient of the contact surface is 0. 1. Spring stiffness is very sensitive to line diameter,and the relationship between spring resilience and line diameter is nonlinear and high-order. Increasing the number of strands of braided yarn will multiply the spring stiffness. The influence of temperature on spring stiffness is small when it is lower than 600 ℃. When it is higher than 600 ℃,spring stiffness decreases rapidly with the increase of temperature. The minimum fatigue life of braided spring tube calculated by S-N curve is higher than that of sealing design at 650 ℃. According to the design requirement of baseline seal,it is recommended to use the parameters of ring density LD=0. 05,line diameter 0. 32 mm and doublewire braiding to make braided spring tube.
引文
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[2]张志刚.高超声速飞行器热防护系统设计方法[D].哈尔滨工业大学,2014.
[3]鲁芹,姜贵庆,罗晓光,等. X-37B空天飞行器轻质非烧蚀热防护新技术[J].现代防御技术,2012,40(1):26-30.
[4]DUNLAP P,STEINETZ B,DEMANGE J. Toward an improved hypersonic engine seal[M]. NASA/TM—2003-212531,July 2003.
[5]DUNLAP P,STEINETZ B. A Comparison of candidate seal designs for future docking systems[C]//Aiaa/asme/sae/asee Joint Propulsion Conference&Exhibit,2013.
[6]王立研,王菁华,杨炳尉,等.高超声速飞行器控制面动密封技术[J].宇航材料工艺,2016,46(3):1-6.
[7]张宇玮,姜艳青,石刚,等.高温基线密封研究进展[J].宇航材料工艺,2011,41(2):21-25.
[8] TAYLOR S,DUNLAP P,DEMANGE J,et al.Evaluation of high temperature knitted spring tubes for structural seal applications[J]. AIAA-2004-3890,July 2004.
[9]PATRICK DUNLAP J,STEINETZ B,CURRY D,et al.Investigations of control surface seals for re-entry vehicles[R].38thAIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit,2002.
[10]TAYLOR S,DEMANGE J,DUNLAP P,et al. Further investigations of high temperature knitted spring tubes for advanced control surface seal applications[R]. AIAA,2005:4154.
[11]汪育桑,冯勋伟.基于几何模型的纬编提花织物结构计算机辅助设计[J].东华大学学报(自然科学版),2000,26(6):66-70.
[12]吴周镜,宋晖,李柏岩,等.纬编针织物在计算机中的三维仿真[J].东华大学学报(自然科学版),2011,37(2):210-214.
[13]DRANSFIELD K,BAILLIE C,MAI Y W. Improving the delamination resistance of CFRP by stitching a review[J].Composites Science&Technology,1994,50(3):305-317.
[14]CHENG S C,LIN Z J,YANG G,et al. Effect of heat treatment on the properties of Inconel X-750[J]. Key Engineering Materials,2005,297-300(1-4):1220-1222.
[15]姚亮亮,张显程,刘峰,等. GH4169镍基高温合金的高温低周疲劳性能[J].机械工程材料,2016,40(4):25-29.