复合材料密封环局部高温热带生成的有限元建模与影响因素
发布时间：2019-05-06 17:01
【摘要】：结合密封环的工作特点和结构形式,提出密封环在接触过程中局部高温热带生成的模拟方法。基于伽辽金有限元算法,构建密封系统的热传导、热流密度、温度场扰动等非均匀特性的物理模型,及其各物理场之间的耦合关系,将密封环局部高温热带的热不稳定问题转化为矩阵行列式,并进行求解,可以获得在不同的摩擦条件下,发生局部高温热带的临界速度值。同时,模拟计算获得了临界速度与摩擦因数、弹性模量、导热系数、热膨胀系数和密封环尺寸的关系曲线。除导热系数外,其余几个因素对生成高温热带的临界速度影响较大。利用密封系统试验台进行结果分析和模型验证,在高温热带的临界速度方面,试验结果与模拟计算保持一致。通过扫描电子显微镜进行密封表面形貌分析,在试验速度高于临界速度的条件下进行试验后,密封表面出现明显的带状磨痕,与高温热带特征有较高的吻合度,表明有限元离散模型在密封热不稳定研究方面的适用性。
[Abstract]:Combined with the working characteristics and structural forms of the sealing ring, a simulation method for the formation of the local high temperature tropical zone during the contact process of the sealing ring is proposed. Based on Galerkin finite element method, the physical model of heat conduction, heat flux density, temperature field disturbance and the coupling relationship among the physical fields of the sealed system are constructed. The problem of thermal instability in the local high temperature zone of the sealing ring is transformed into a matrix determinant, and the critical velocity values of the local high temperature zone can be obtained under different friction conditions. At the same time, the curves of critical velocity and friction coefficient, elastic modulus, thermal conductivity, thermal expansion coefficient and size of seal ring are obtained. In addition to the thermal conductivity, the other factors have a great influence on the critical velocity of the high temperature zone. The results are analyzed and verified by using the sealing system test-bed. The experimental results are consistent with the simulation results in the critical velocity of the high-temperature tropical zone. The surface morphology of the seal was analyzed by scanning electron microscope. When the test speed was higher than the critical speed, there were obvious band wear marks on the seal surface, which were in good agreement with the characteristics of the high temperature tropics. It is shown that the finite element discrete model is applicable to the study of thermal instability of seals.
【作者单位】： 江苏大学汽车与交通工程学院;中国北方车辆研究所;
【基金】：国家自然科学基金(51675238) 中国博士后科学基金(2017M610301) 江苏省“六大人才高峰”高层次人才(2014-JXQC-005) 江苏大学科技项目青年扶持基金(FCJJ005)资助项目
【分类号】：TB33;TH136
本文编号：2470342
[Abstract]:Combined with the working characteristics and structural forms of the sealing ring, a simulation method for the formation of the local high temperature tropical zone during the contact process of the sealing ring is proposed. Based on Galerkin finite element method, the physical model of heat conduction, heat flux density, temperature field disturbance and the coupling relationship among the physical fields of the sealed system are constructed. The problem of thermal instability in the local high temperature zone of the sealing ring is transformed into a matrix determinant, and the critical velocity values of the local high temperature zone can be obtained under different friction conditions. At the same time, the curves of critical velocity and friction coefficient, elastic modulus, thermal conductivity, thermal expansion coefficient and size of seal ring are obtained. In addition to the thermal conductivity, the other factors have a great influence on the critical velocity of the high temperature zone. The results are analyzed and verified by using the sealing system test-bed. The experimental results are consistent with the simulation results in the critical velocity of the high-temperature tropical zone. The surface morphology of the seal was analyzed by scanning electron microscope. When the test speed was higher than the critical speed, there were obvious band wear marks on the seal surface, which were in good agreement with the characteristics of the high temperature tropics. It is shown that the finite element discrete model is applicable to the study of thermal instability of seals.
【作者单位】： 江苏大学汽车与交通工程学院;中国北方车辆研究所;
【基金】：国家自然科学基金(51675238) 中国博士后科学基金(2017M610301) 江苏省“六大人才高峰”高层次人才(2014-JXQC-005) 江苏大学科技项目青年扶持基金(FCJJ005)资助项目
【分类号】：TB33;TH136
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